README.md

LiteSql

简介

一款使用原生SQL查询的轻量级ORM，支持Oracle、MSSQL、MySQL、PostgreSQL、SQLite、Access数据库。

经典示例

DateTime? startTime = null;

var session = LiteSqlFactory.GetSession();

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

List<SysUser> list = session.CreateSql(@"
    select * from sys_user t where t.id <= @Id", new { Id = 20 })

    .Append(@" and t.create_userid = @CreateUserId 
        and t.password like @Password
        and t.id in @Ids",
        new
        {
            CreateUserId = "1",
            Password = "%345%",
            Ids = session.ForList(new List<int> { 1, 2, 9, 10, 11 })
        })

    .AppendIf(startTime.HasValue, " and t.create_time >= @StartTime ", new { StartTime = startTime })

    .Append(" and t.create_time <= @EndTime ", new { EndTime = new DateTime(2022, 8, 1) })

    .QueryList<SysUser>();

long id = session.CreateSql("select id from sys_user where id=@Id", new { Id = 1 })
    .QuerySingle<long>();
Assert.IsTrue(id == 1);

foreach (SysUser item in list)
{
    Console.WriteLine(ModelToStringUtil.ToString(item));
}
Assert.IsTrue(list.Count > 0);

特点

支持Oracle、SQL Server、MySQL、PostgreSQL、SQLite五种数据库；另外只要ADO.NET支持的数据库，都可以很方便地通过实现IProvider接口支持，仅需写150行左右的代码
有配套的Model生成器
数据插入、更新、批量插入、批量更新，支持实体类、实体类集合，无需拼SQL；删除操作支持根据主键或查询条件删除；增删改支持联合主键
查询以原生SQL为主，Lambda表达式辅助
支持参数化查询，统一不同数据库的参数化查询SQL
支持连接多个数据源
支持手动分表
单表查询、单表分页查询、简单的连表查询支持Lambda表达式
支持原生SQL和Lambda表达式混写
支持拼接子查询；主查询、子查询可以分开拼接，逻辑更清晰

优点

比较简单，学习成本低
查询以原生SQL为主，简单Lambda表达式辅助
代码量仅4000多行，更容易修改和掌控代码质量

缺点

对Lambda表达式的支持比较弱
复杂查询不支持Lambda表达式(子查询、分组统计查询、嵌套查询等不支持Lambda表达式写法)

建议

单表查询、简单的连表查询可以使用Lambda表达式
复杂查询建议使用原生SQL
如果出现不支持的Lambda表达式写法，请使用原生SQL替代

开发环境

VS2022
目标框架：net461;netstandard2.0;net5.0
测试工程使用.NET Framework 4.5.2

配套Model生成器地址：

https://gitee.com/s0611163/ModelGenerator

支持 ClickHouse 数据库

https://gitee.com/s0611163/ClickHouseTest

这是一个示例，只要ADO.NET支持的数据库，您都可以通过实现IProvider接口尝试支持

.NET 6 环境下测试

https://gitee.com/s0611163/LiteSqlTest

作者邮箱

651029594@qq.com

使用步骤

安装LiteSql

Install-Package Dapper.LiteSql -Version 1.6.20

安装对应的数据库引擎

Install-Package MySql.Data -Version 6.9.12

实现对应的数据库Provider

注意：各实现方法一定要加上override关键字以重写基类的方法

using LiteSql;
using MySql.Data.MySqlClient;
using System.Data.Common;

namespace DAL
{
    public class MySQLProvider : MySQLProviderBase, IDBProvider
    {
        #region 创建 DbConnection
        public override DbConnection CreateConnection(string connectionString)
        {
            return new MySqlConnection(connectionString);
        }
        #endregion

        #region 生成 DbParameter
        public override DbParameter GetDbParameter(string name, object value)
        {
            return new MySqlParameter(name, value);
        }
        #endregion

    }
}

定义LiteSqlFactory类

using LiteSql;
using System.Configuration;
using System.Threading.Tasks;

namespace DAL
{
    public class LiteSqlFactory
    {
        #region 变量
        private static ILiteSqlClient _liteSqlClient = new LiteSqlClient(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString(), DBType.MySQL, new MySQLProvider());
        #endregion

        #region 获取 ISession
        /// <summary>
        /// 获取 ISession
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static ISession GetSession(SplitTableMapping splitTableMapping = null)
        {
            return _liteSqlClient.GetSession(splitTableMapping);
        }
        #endregion

        #region 获取 ISession (异步)
        /// <summary>
        /// 获取 ISession (异步)
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static async Task<ISession> GetSessionAsync(SplitTableMapping splitTableMapping = null)
        {
            return await _liteSqlClient.GetSessionAsync(splitTableMapping);
        }
        #endregion

    }
}

配套Model生成器

使用Model生成器生成实体类

实体类放在Models文件夹中
扩展实体类放在ExtModels文件夹中
实体类和扩展实体类使用partial修饰，实际上是一个类，放在不同的文件中
如果需要添加自定义属性，请修改ExtModels，不要修改Models

实体类示例

/// <summary>
/// 订单表
/// </summary>
[Serializable]
[Table("bs_order")]
public partial class BsOrder
{

    /// <summary>
    /// 主键
    /// </summary>
    [Key]
    [Column("id")]
    public string Id { get; set; }

    /// <summary>
    /// 订单时间
    /// </summary>
    [Column("order_time")]
    public DateTime OrderTime { get; set; }

    /// <summary>
    /// 订单金额
    /// </summary>
    [Column("amount")]
    public decimal? Amount { get; set; }

    /// <summary>
    /// 下单用户
    /// </summary>
    [Column("order_userid")]
    public long OrderUserid { get; set; }

    /// <summary>
    /// 订单状态(0草稿 1已下单 2已付款 3已发货 4完成)
    /// </summary>
    [Column("status")]
    public int Status { get; set; }

    /// <summary>
    /// 备注
    /// </summary>
    [Column("remark")]
    public string Remark { get; set; }

    /// <summary>
    /// 创建者ID
    /// </summary>
    [Column("create_userid")]
    public string CreateUserid { get; set; }

    /// <summary>
    /// 创建时间
    /// </summary>
    [Column("create_time")]
    public DateTime CreateTime { get; set; }

    /// <summary>
    /// 更新者ID
    /// </summary>
    [Column("update_userid")]
    public string UpdateUserid { get; set; }

    /// <summary>
    /// 更新时间
    /// </summary>
    [Column("update_time")]
    public DateTime? UpdateTime { get; set; }

}

修改扩展实体类

修改扩展实体类，添加自定义属性
下面的扩展实体类中，查询时OrderUserRealName会被自动填充，查询SQL：select t.*, u.real_name as OrderUserRealName from ......
DetailList不会被自动填充，需要手动查询

扩展实体类示例

/// <summary>
/// 订单表
/// </summary>
public partial class BsOrder
{
    /// <summary>
    /// 订单明细集合
    /// </summary>
    public List<BsOrderDetail> DetailList { get; set; }

    /// <summary>
    /// 下单用户姓名
    /// </summary>
    public string OrderUserRealName { get; set; }

    /// <summary>
    /// 下单用户名
    /// </summary>
    public string OrderUserName { get; set; }
}

增删改查示例

添加

public void Insert(SysUser info)
{
    var session = LiteSqlFactory.GetSession();
    session.Insert(info);  
}

添加并返回ID

public void Insert(SysUser info)
{
    var session = LiteSqlFactory.GetSession();
    long id = session.InsertReturnId(info, "select @@IDENTITY");   
}

批量添加

public void Insert(List<SysUser> list)
{
    var session = LiteSqlFactory.GetSession();
    session.Insert(list);   
}

修改

public void Update(SysUser info)
{
    var session = LiteSqlFactory.GetSession();
    session.Update(info);
}

批量修改

public void Update(List<SysUser> list)
{
    var session = LiteSqlFactory.GetSession();
    session.Update(list);
}

修改时只更新数据有变化的字段

var session = LiteSqlFactory.GetSession();

session.AttachOld(user); //附加更新前的旧数据，只更新数据发生变化的字段，提升更新性能

user.UpdateUserid = "1";
user.Remark = "测试修改用户" + _rnd.Next(1, 100);
user.UpdateTime = DateTime.Now;

session.Update(user);

var session = LiteSqlFactory.GetSession();

session.AttachOld(userList); //附加更新前的旧数据，只更新数据发生变化的字段，提升更新性能

foreach (SysUser user in userList)
{
    user.Remark = "测试修改用户" + _rnd.Next(1, 10000);
    user.UpdateUserid = "1";
    user.UpdateTime = DateTime.Now;
}

session.Update(userList);

删除

public void Delete(string id)
{
    var session = LiteSqlFactory.GetSession();
    session.DeleteById<SysUser>(id);
}

条件删除

var session = LiteSqlFactory.GetSession();
session.CreateSql("id>@Id", 20).Delete<SysUser>();

var session = LiteSqlFactory.GetSession();
session.Queryable<SysUser>().Where(t => t.Id > 20).Delete();

查询单个记录

public SysUser Get(string id)
{
    var session = LiteSqlFactory.GetSession();
    return session.QueryById<SysUser>(id);
}

var session = LiteSqlFactory.GetSession();
SysUser user = session.Query<SysUser>("select * from sys_user");

简单查询

var session = LiteSqlFactory.GetSession();
string sql = "select * from CARINFO_MERGE";
List<CarinfoMerge> result = session.QueryList<CarinfoMerge>(sql);

条件查询

public List<BsOrder> GetList(int? status, string remark, DateTime? startTime, DateTime? endTime)
{
    var session = LiteSqlFactory.GetSession();

    ISqlString sql = session.CreateSql(@"
        select t.*, u.real_name as OrderUserRealName
        from bs_order t
        left join sys_user u on t.order_userid=u.id
        where 1=1");

    sql.AppendIf(status.HasValue, " and t.status=@status", status);

    sql.AppendIf(!string.IsNullOrWhiteSpace(remark), " and t.remark like @remark", "%" + remark + "%");

    sql.AppendIf(startTime.HasValue, " and t.order_time >= @startTime ", startTime);

    sql.AppendIf(endTime.HasValue, " and t.order_time <= @endTime ", endTime);

    sql.Append(" order by t.order_time desc, t.id asc ");

    List<BsOrder> list = session.QueryList<BsOrder>(sql);
    return list;
}

条件查询(SQL参数支持匿名对象)

public List<BsOrder> GetList(int? status, string remark, DateTime? startTime, DateTime? endTime)
{
    var session = LiteSqlFactory.GetSession();

    ISqlString sql = session.CreateSql(@"
        select t.*, u.real_name as OrderUserRealName
        from bs_order t
        left join sys_user u on t.order_userid=u.id
        where 1=1");

    sql.AppendIf(status.HasValue, " and t.status=@Status", new { Status = status });

    sql.AppendIf(!string.IsNullOrWhiteSpace(remark), " and t.remark like @Remark", new { Remark = "%" + remark + "%" });

    sql.AppendIf(startTime.HasValue, " and t.order_time >= @StartTime ", new { StartTime = startTime } });

    sql.AppendIf(endTime.HasValue, " and t.order_time <= @EndTime ", endTime });

    sql.Append(" order by t.order_time desc, t.id asc ");

    List<BsOrder> list = session.QueryList<BsOrder>(sql);
    return list;
}

分页查询

public List<BsOrder> GetListPage(ref PageModel pageModel, int? status, string remark, DateTime? startTime, DateTime? endTime)
{
    var session = LiteSqlFactory.GetSession();

    ISqlString sql = session.CreateSql(@"
        select t.*, u.real_name as OrderUserRealName
        from bs_order t
        left join sys_user u on t.order_userid=u.id
        where 1=1");

    sql.AppendIf(status.HasValue, " and t.status=@status", status);

    sql.AppendIf(!string.IsNullOrWhiteSpace(remark), " and t.remark like @remark", "%" + remark + "%");

    sql.AppendIf(startTime.HasValue, " and t.order_time >= @startTime ", startTime);

    sql.AppendIf(endTime.HasValue, " and t.order_time <= @endTime ", endTime);

    string orderby = " order by t.order_time desc, t.id asc ";
    
    pageModel.TotalRows = session.QueryCount(sql);
    return session.QueryPage<BsOrder>(sql, orderby, pageModel.PageSize, pageModel.CurrentPage);
}

事务

public string Insert(BsOrder order, List<BsOrderDetail> detailList)
{
    var session = LiteSqlFactory.GetSession();

    try
    {
        session.BeginTransaction();

        order.Id = Guid.NewGuid().ToString("N");
        order.CreateTime = DateTime.Now;

        decimal amount = 0;
        foreach (BsOrderDetail detail in detailList)
        {
            detail.Id = Guid.NewGuid().ToString("N");
            detail.OrderId = order.Id;
            detail.CreateTime = DateTime.Now;
            amount += detail.Price * detail.Quantity;
            session.Insert(detail);
        }
        order.Amount = amount;

        session.Insert(order);

        session.CommitTransaction();

        return order.Id;
    }
    catch (Exception ex)
    {
        session.RollbackTransaction();
        Console.WriteLine(ex.Message + "\r\n" + ex.StackTrace);
        throw ex;
    }
}

异步查询

public async Task<List<BsOrder>> GetListPageAsync(PageModel pageModel, int? status, string remark, DateTime? startTime, DateTime? endTime)
{
    var session = LiteSqlFactory.GetSession();

    ISqlString sql = session.CreateSql(@"
        select t.*, u.real_name as OrderUserRealName
        from bs_order t
        left join sys_user u on t.order_userid=u.id
        where 1=1");

    sql.AppendIf(status.HasValue, " and t.status=@status", status);

    sql.AppendIf(!string.IsNullOrWhiteSpace(remark), " and t.remark like @remark", "%" + remark + "%");

    sql.AppendIf(startTime.HasValue, " and t.order_time >= @startTime ", startTime);

    sql.AppendIf(endTime.HasValue, " and t.order_time <= @endTime ", endTime);

    string orderby = " order by t.order_time desc, t.id asc ";
    
    var countResult = await session.QueryCountAsync(sql, pageModel.PageSize);
    pageModel.TotalRows = countResult.Count;
    return await session.QueryPageAsync<BsOrder>(sql, orderby, pageModel.PageSize, pageModel.CurrentPage);
}

条件查询(使用 ForList 辅助方法)

public List<BsOrder> GetListExt(int? status, string remark, DateTime? startTime, DateTime? endTime, string ids)
{
    var session = LiteSqlFactory.GetSession();

    ISqlString sql = session.CreateSql(@"
        select t.*, u.real_name as OrderUserRealName
        from bs_order t
        left join sys_user u on t.order_userid=u.id
        where 1=1");

    sql.AppendIf(status.HasValue, " and t.status=@status", status);

    sql.AppendIf(!string.IsNullOrWhiteSpace(remark), " and t.remark like @remark", "%" + remark + "%");

    sql.AppendIf(startTime.HasValue, " and t.order_time >= @startTime ", startTime);

    sql.AppendIf(endTime.HasValue, " and t.order_time <= @endTime ", endTime);

    sql.Append(" and t.id in @ids ", sql.ForList(ids.Split(',').ToList()));

    sql.Append(" order by t.order_time desc, t.id asc ");

    List<BsOrder> list = session.QueryList<BsOrder>(sql);
    return list;
}

使用Lambda表达式单表查询

单表分页查询使用ToPageList替换ToList即可

public void TestQueryByLambda6()
{
    var session = LiteSqlFactory.GetSession();

    ISqlQueryable<BsOrder> sql = session.Queryable<BsOrder>();

    string remark = "测试";

    List<BsOrder> list = sql.WhereIf(!string.IsNullOrWhiteSpace(remark),
        t => t.Remark.Contains(remark)
        && t.CreateTime < DateTime.Now
        && t.CreateUserid == "10")

        .OrderByDescending(t => t.OrderTime).OrderBy(t => t.Id)
        .ToList();

    foreach (BsOrder item in list)
    {
        Console.WriteLine(ModelToStringUtil.ToString(item));
    }
}

使用Lambda表达式联表分页查询(简单的联表查询，复杂情况请使用原生SQL或原生SQL和Lambda表达式混写)

public void TestQueryByLambda7()
{
    var session = LiteSqlFactory.GetSession();

    ISqlQueryable<BsOrder> sql = session.Queryable<BsOrder>();

    int total;
    List<string> idsNotIn = new List<string>() { "100007", "100008", "100009" };

    List<BsOrder> list = sql
        .Select<SysUser>(u => u.UserName, t => t.OrderUserName)
        .Select<SysUser>(u => u.RealName, t => t.OrderUserRealName)
        .LeftJoin<SysUser>((t, u) => t.OrderUserid == u.Id)
        .LeftJoin<BsOrderDetail>((t, d) => t.Id == d.OrderId)
        .Where<SysUser, BsOrderDetail>((t, u, d) => t.Remark.Contains("订单") && u.CreateUserid == "1" && d.GoodsName != null)
        .WhereIf<BsOrder>(true, t => t.Remark.Contains("测试"))
        .WhereIf<BsOrder>(true, t => !idsNotIn.Contains(t.Id))
        .WhereIf<SysUser>(true, u => u.CreateUserid == "1")
        .OrderByDescending(t => t.OrderTime).OrderBy(t => t.Id)
        .ToPageList(1, 20, out total);

    foreach (BsOrder item in list)
    {
        Console.WriteLine(ModelToStringUtil.ToString(item));
    }
}

原生SQL和Lambda表达式混写

public void TestQueryByLambda9()
{
    var session = LiteSqlFactory.GetSession();

    ISqlQueryable<BsOrder> sql = session.CreateSql<BsOrder>(@"
        select t.*, u.real_name as OrderUserRealName
        from bs_order t
        left join sys_user u on t.order_userid=u.id");

    List<BsOrder> list = sql.Where(t => t.Status == int.Parse("0")
        && t.Status == new BsOrder().Status
        && t.Remark.Contains("订单")
        && t.Remark != null
        && t.OrderTime >= new DateTime(2010, 1, 1)
        && t.OrderTime <= DateTime.Now.AddDays(1))
        .WhereIf<SysUser>(true, u => u.CreateTime < DateTime.Now)
        .OrderByDescending(t => t.OrderTime).OrderBy(t => t.Id)
        .ToList();

    foreach (BsOrder item in list)
    {
        Console.WriteLine(ModelToStringUtil.ToString(item));
    }
}

DateTime? startTime = null;

var session = LiteSqlFactory.GetSession();

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

List<SysUser> list = session.Queryable<SysUser>() //Lambda写法

    //拼SQL写法
    .Append<SysUser>(@" where t.create_userid = @CreateUserId 
        and t.password like @Password
        and t.id in @Ids",
        new
        {
            CreateUserId = "1",
            Password = "%345%",
            Ids = session.ForList(new List<int> { 1, 2, 9, 10, 11 })
        })

    .Where(t => !t.RealName.Contains("管理员")) //Lambda写法

    .Append<SysUser>(@" and t.create_time >= @StartTime", new { StartTime = new DateTime(2020, 1, 1) }) //拼SQL写法

    .Where<SysUser>(t => t.Id <= 20) //Lambda写法

    .AppendIf(startTime.HasValue, " and t.create_time >= @StartTime ", new { StartTime = startTime }) //拼SQL写法

    .Append(" and t.create_time <= @EndTime ", new { EndTime = new DateTime(2022, 8, 1) }) //拼SQL写法

    .QueryList<SysUser>(); //如果上一句是拼SQL写法，就用QueryList
    //.ToList(); //如果上一句是Lambda写法，就用ToList

long id = session.Queryable<SysUser>().Where(t => t.Id == 1).First().Id;
Assert.IsTrue(id == 1);

foreach (SysUser item in list)
{
    Console.WriteLine(ModelToStringUtil.ToString(item));
}
Assert.IsTrue(list.Count > 0);

拼接子SQL

var session = LiteSqlFactory.GetSession();

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

var subSql = session.CreateSql<SysUser>().Select(t => new { t.Id }).Where(t => !t.RealName.Contains("管理员"));

var subSql2 = session.CreateSql<SysUser>().Select(t => new { t.Id }).Where(t => t.Id <= 20);

var sql = session.Queryable<SysUser>()

    .Where(t => t.Password.Contains("345"))

    .Append(" and id in ", subSql)

    .Append<SysUser>(@" and t.create_time >= @StartTime", new { StartTime = new DateTime(2020, 1, 1) })

    .Append<SysUser>(" and id in ", subSql2)

    .Where(t => t.Password.Contains("234"));

var sql2 = session.Queryable<SysUser>().Where(t => t.RealName.Contains("管理员"));

sql.Append(" union all ", sql2);

List<SysUser> list = sql.QueryList<SysUser>();

foreach (SysUser item in list)
{
    Console.WriteLine(ModelToStringUtil.ToString(item));
}
Assert.IsTrue(list.Count > 0);
Assert.IsTrue(list.Count(t => t.RealName.Contains("管理员")) > 0);
Assert.IsTrue(list.Count(t => t.Id > 20) == 0);

拼接子查询

var session = LiteSqlFactory.GetSession();

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

List<SysUser> list = session.Queryable<SysUser>(
    t => new
    {
        t.RealName,
        t.CreateUserid
    })
    .Select("count(id) as Count")
    .Where(t => t.Id >= 0)
    .GroupBy<SysUser>("t.real_name, t.create_userid")
    .Having<SysUser>("real_name like @Name1 or real_name like @Name2", new
    {
        Name1 = "%管理员%",
        Name2 = "%测试%"
    })
    .ToList();

foreach (SysUser item in list)
{
    Console.WriteLine(ModelToStringUtil.ToString(item));
}
Assert.IsTrue(list.Count > 0);

var session = LiteSqlFactory.GetSession();

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

List<SysUser> list = session.CreateSql<SysUser>()
    .Select(t => new
    {
        t.RealName,
        t.CreateUserid
    })
    .Select(session.CreateSql(@"(
            select count(1) 
            from bs_order o 
            where o.order_userid = t.id
            and o.status = @Status
        ) as OrderCount", new { Status = 0 }))
    .Where(t => t.Id >= 0)
    .ToList();

foreach (SysUser item in list)
{
    Console.WriteLine(ModelToStringUtil.ToString(item));
}
Assert.IsTrue(list.Count > 0);

直接使用Dapper

有的功能Dapper.LiteSql不支持，例如调用存储过程，可以直接使用Dapper 使用Dapper时，可以直接new数据库连接对象，也可以从连接池获取连接对象

var session = LiteSqlFactory.GetSession();

session.SetTypeMap<SysUser>(); //设置数据库字段名与实体类属性名映射

using (var conn = session.GetConnection()) //此处从连接池获取连接，用完一定要释放，也可以不使用连接池，直接new MySqlConnection
{
    DynamicParameters dynamicParameters = new DynamicParameters();
    dynamicParameters.Add("id", 20);

    List<SysUser> list = conn.Conn.Query<SysUser>(@"
        select *
        from sys_user 
        where id < @id", dynamicParameters).ToList();

    foreach (SysUser item in list)
    {
        Console.WriteLine(ModelToStringUtil.ToString(item));

        Assert.IsTrue(!string.IsNullOrWhiteSpace(item.UserName));
    }
}

手动分表

定义LiteSqlFactory类

using LiteSql;
using System.Configuration;
using System.Threading.Tasks;

namespace DAL
{
    public class LiteSqlFactory
    {
        #region 变量
        private static ILiteSqlClient _liteSqlClient = new LiteSqlClient(ConfigurationManager.ConnectionStrings["DefaultConnection"].ToString(), DBType.MySQL, new MySQLProvider());
        #endregion

        #region 获取 ISession
        /// <summary>
        /// 获取 ISession
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static ISession GetSession(SplitTableMapping splitTableMapping = null)
        {
            return _liteSqlClient.GetSession(splitTableMapping);
        }
        #endregion

        #region 获取 ISession (异步)
        /// <summary>
        /// 获取 ISession (异步)
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static async Task<ISession> GetSessionAsync(SplitTableMapping splitTableMapping = null)
        {
            return await _liteSqlClient.GetSessionAsync(splitTableMapping);
        }
        #endregion

    }
}

数据插入

SplitTableMapping splitTableMapping = new SplitTableMapping(typeof(SysUser), "sys_user_202208");

var session = LiteSqlFactory.GetSession(splitTableMapping);

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

session.Insert(user);

user.Id = session.QuerySingle<long>("select @@IDENTITY");
Console.WriteLine("插入成功, user.Id=" + user.Id);

数据更新

SplitTableMapping splitTableMapping = new SplitTableMapping(typeof(SysUser), "sys_user_202208");

var session = LiteSqlFactory.GetSession(splitTableMapping);

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

session.AttachOld(user); //附加更新前的旧数据，只更新数据发生变化的字段，提升更新性能

user.UpdateUserid = "1";
user.Remark = "测试修改分表数据" + _rnd.Next(1, 100);
user.UpdateTime = DateTime.Now;

session.Update(user);

数据删除

SplitTableMapping splitTableMapping = new SplitTableMapping(typeof(SysUser), "sys_user_202208");

var session = LiteSqlFactory.GetSession(splitTableMapping);

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

int deleteCount = session.DeleteByCondition<SysUser>(string.Format("id>20"));
Console.WriteLine(deleteCount + "条数据已删除");
int deleteCount2 = session.DeleteById<SysUser>(10000);
Console.WriteLine(deleteCount2 + "条数据已删除");

数据查询

var session = LiteSqlFactory.GetSession(splitTableMapping);

session.OnExecuting = (s, p) => Console.WriteLine(s); //打印SQL

ISqlQueryable<SysUser> sql = session.Queryable<SysUser>();

List<SysUser> list = sql.Where(t => t.Id < 10)
    .OrderBy(t => t.Id)
    .ToList();

支持更多数据库

只要ADO.NET支持的数据库，都可以支持

如何实现

以PostgreSQL为例，假如该库尚未支持PostgreSQL

定义一个数据库提供者类，实现IProvider接口

using LiteSql;
using Npgsql;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data.Common;
using System.Text;

namespace PostgreSQLTest
{
    public class PostgreSQLProvider : IProvider
    {
        #region OpenQuote 引号
        /// <summary>
        /// 引号
        /// </summary>
        public string OpenQuote
        {
            get
            {
                return "\"";
            }
        }
        #endregion

        #region CloseQuote 引号
        /// <summary>
        /// 引号
        /// </summary>
        public string CloseQuote
        {
            get
            {
                return "\"";
            }
        }
        #endregion

        #region 创建 DbConnection
        public DbConnection CreateConnection(string connectionString)
        {
            return new NpgsqlConnection(connectionString);
        }
        #endregion

        #region 生成 DbParameter
        public DbParameter GetDbParameter(string name, object value)
        {
            return new NpgsqlParameter(name, value);
        }
        #endregion

        #region GetParameterName
        public string GetParameterName(string parameterName, Type parameterType)
        {
            return "@" + parameterName;
        }
        #endregion

        #region 创建获取最大编号SQL
        public string CreateGetMaxIdSql(string key, Type type)
        {
            return string.Format("SELECT Max({0}) FROM {1}", key, type.Name);
        }
        #endregion

        #region 创建分页SQL
        public string CreatePageSql(string sql, string orderby, int pageSize, int currentPage, int totalRows)
        {
            StringBuilder sb = new StringBuilder();
            int startRow = 0;
            int endRow = 0;

            #region 分页查询语句
            startRow = pageSize * (currentPage - 1);

            sb.Append("select * from (");
            sb.Append(sql);
            if (!string.IsNullOrWhiteSpace(orderby))
            {
                sb.Append(" ");
                sb.Append(orderby);
            }
            sb.AppendFormat(" ) row_limit limit {0} offset {1}", pageSize, startRow);
            #endregion

            return sb.ToString();
        }
        #endregion

        #region 删除SQL语句模板
        /// <summary>
        /// 删除SQL语句模板 两个值分别对应 “delete from [表名] where [查询条件]”中的“delete from”和“where”
        /// </summary>
        public Tuple<string, string> CreateDeleteSqlTempldate()
        {
            return new Tuple<string, string>("delete from", "where");
        }
        #endregion

        #region 更新SQL语句模板
        /// <summary>
        /// 更新SQL语句模板 三个值分别对应 “update [表名] set [赋值语句] where [查询条件]”中的“update”、“set”和“where”
        /// </summary>
        public Tuple<string, string, string> CreateUpdateSqlTempldate()
        {
            return new Tuple<string, string, string>("update", "set", "where");
        }
        #endregion

        #region ForList
        public SqlValue ForList(IList list)
        {
            List<string> argList = new List<string>();
            for (int i = 0; i < list.Count; i++)
            {
                argList.Add("@inParam" + i);
            }
            string args = string.Join(",", argList);

            return new SqlValue("(" + args + ")", list);
        }
        #endregion

    }
}

定义LiteSqlFactory类

下面代码是.NET 5下的代码

using LiteSql;
using Microsoft.Extensions.Configuration;
using System.Threading.Tasks;

namespace PostgreSQLTest
{
    public class LiteSqlFactory
    {
        #region 变量
        private static ILiteSqlClient _liteSqlClient;
        #endregion

        #region 静态构造函数
        static LiteSqlFactory()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");
            _liteSqlClient = new LiteSqlClient(connectionString, typeof(PostgreSQLProvider), new PostgreSQLProvider());
        }
        #endregion

        #region 获取 ISession
        /// <summary>
        /// 获取 ISession
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static ISession GetSession(SplitTableMapping splitTableMapping = null)
        {
            return _liteSqlClient.GetSession(splitTableMapping);
        }
        #endregion

        #region 获取 ISession (异步)
        /// <summary>
        /// 获取 ISession (异步)
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static async Task<ISession> GetSessionAsync(SplitTableMapping splitTableMapping = null)
        {
            return await _liteSqlClient.GetSessionAsync(splitTableMapping);
        }
        #endregion

    }
}

然后就可以使用了

支持ClickHouse

定义ClickHouseProvider类实现IProvider接口

using ClickHouse.Client.ADO;
using ClickHouse.Client.ADO.Parameters;
using Dapper.LiteSql;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LiteSql.Provider
{
    public class ClickHouseProvider : IProvider
    {
        #region Quote
        public string OpenQuote
        {
            get
            {
                return "\"";
            }
        }

        public string CloseQuote
        {
            get
            {
                return "\"";
            }
        }
        #endregion

        #region 创建Db对象
        public DbConnection CreateConnection(string connectionString)
        {
            return new ClickHouseConnection(connectionString);
        }

        public DbCommand GetCommand(DbConnection conn)
        {
            DbCommand command = conn.CreateCommand();
            return command;
        }

        public DbCommand GetCommand(string sql, DbConnection conn)
        {
            DbCommand command = conn.CreateCommand();
            command.CommandText = sql;
            return command;
        }

        public DbParameter GetDbParameter(string name, object value)
        {
            DbParameter parameter = new ClickHouseDbParameter();
            parameter.ParameterName = name.Trim(new char[] { '{', '}' }).Split(':')[0];
            parameter.Value = value;
            DbType dbType = ColumnTypeUtil.GetDBType(value);
            parameter.DbType = dbType;
            return parameter;
        }
        #endregion

        #region Create SQL
        public string CreateGetMaxIdSql(string tableName, string key)
        {
            return string.Format("SELECT Max({0}) FROM {1}", key, tableName);
        }

        public string CreatePageSql(string sql, string orderby, int pageSize, int currentPage)
        {
            StringBuilder sb = new StringBuilder();
            int startRow = 0;
            int endRow = 0;

            #region 分页查询语句
            startRow = pageSize * (currentPage - 1);

            sb.Append("select * from (");
            sb.Append(sql);
            if (!string.IsNullOrWhiteSpace(orderby))
            {
                sb.Append(" ");
                sb.Append(orderby);
            }
            sb.AppendFormat(" ) row_limit limit {0},{1}", startRow, pageSize);
            #endregion

            return sb.ToString();
        }
        #endregion

        #region 删除SQL语句模板
        /// <summary>
        /// 删除SQL语句模板 两个值分别对应 “delete from [表名] where [查询条件]”中的“delete from”和“where”
        /// </summary>
        public Tuple<string, string> CreateDeleteSqlTempldate()
        {
            return new Tuple<string, string>("alter table", "delete where");
        }
        #endregion

        #region 更新SQL语句模板
        /// <summary>
        /// 更新SQL语句模板 三个值分别对应 “update [表名] set [赋值语句] where [查询条件]”中的“update”、“set”和“where”
        /// </summary>
        public Tuple<string, string, string> CreateUpdateSqlTempldate()
        {
            return new Tuple<string, string, string>("alter table", "update", "where");
        }
        #endregion

        #region GetParameterName
        public string GetParameterName(string parameterName, Type parameterType)
        {
            return "{" + parameterName + ":" + parameterType.Name + "}";
        }
        #endregion

        #region ForList

        public SqlValue ForList(IList list)
        {
            List<string> argList = new List<string>();
            for (int i = 0; i < list.Count; i++)
            {
                argList.Add("@inParam" + i);
            }
            string args = string.Join(",", argList);

            return new SqlValue("(" + args + ")", list);
        }

        #endregion

    }
}

ColumnTypeUtil工具类

类型转换暂时只写了DateTime和String类型，需要补充

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LiteSql.Provider
{
    public class ColumnTypeUtil
    {
        public static DbType GetDBType(object value)
        {
            Type type = value.GetType();
            if (type == typeof(DateTime))
            {
                return DbType.DateTime;
            }
            else if (type == typeof(string))
            {
                return DbType.String;
            }
            return DbType.String;
        }
    }
}

定义LiteSqlFactory

using LiteSql;
using LiteSql.Provider;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ClickHouseTest
{
    public class LiteSqlFactory
    {
        #region 变量
        private static ILiteSqlClient _liteSqlClient;
        #endregion

        #region 静态构造函数
        static LiteSqlFactory()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            _liteSqlClient = new LiteSqlClient(connectionString, typeof(ClickHouseProvider), new ClickHouseProvider());
        }
        #endregion

        #region 获取 ISession
        /// <summary>
        /// 获取 ISession
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static ISession GetSession(SplitTableMapping splitTableMapping = null)
        {
            return _liteSqlClient.GetSession(splitTableMapping);
        }
        #endregion

        #region 获取 ISession (异步)
        /// <summary>
        /// 获取 ISession (异步)
        /// </summary>
        /// <param name="splitTableMapping">分表映射</param>
        public static async Task<ISession> GetSessionAsync(SplitTableMapping splitTableMapping = null)
        {
            return await _liteSqlClient.GetSessionAsync(splitTableMapping);
        }
        #endregion

    }
}

实体类

using LiteSql;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Models
{
    [Table("people_face_replica")]
    public class PeopleFace
    {
        [Column("captured_time")]
        public DateTime CapturedTime { get; set; }

        [Key]
        [Column("camera_id")]
        public string CameraId { get; set; }

        [Column("camera_fun_type")]
        public string CameraFunType { get; set; }

        [Key]
        [Column("face_id")]
        public string FaceId { get; set; }

        [Column("extra_info")]
        public string ExtraInfo { get; set; }

        [Column("event")]
        public string Event { get; set; }

        [Column("data_source3")]
        public string DataSource3 { get; set; }

        [Column("panoramic_image_url")]
        public string PanoramicImageUrl { get; set; }

        [Column("portrait_image_url")]
        public string PortraitImageUrl { get; set; }

    }
}

config.json文件

{
  "ConnectionStrings": {
    "DefaultConnection": "Database=default;Username=default;Password=;Host=192.168.120.130;Port=8123;Compression=False;UseSession=False;Timeout=120;allowMultiQueries=true"
  }
}

单元测试代码

using Dapper.LiteSql;
using Models;
using Utils;
using ClickHouse.Client.ADO;
using ClickHouse.Client.ADO.Parameters;
using System.Text;
using Microsoft.Extensions.Configuration;

namespace ClickHouseTest
{
    [TestClass]
    public class QueryTest
    {
        #region 测试查询数量
        [TestMethod]
        public void Test1Count()
        {
            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            long count = session.Queryable<PeopleFace>().Count();
            Console.WriteLine("总数=" + count.ToString("# #### #### ####"));
            Assert.IsTrue(count > 0);
        }
        #endregion

        #region 测试插入(ADO.NET原生)
        [TestMethod]
        public void Test2Insert1()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            using ClickHouseConnection conn = new ClickHouseConnection(connectionString);
            conn.Open();
            using ClickHouseCommand command = conn.CreateCommand();
            command.CommandText = @"insert into people_face_replica (captured_time, camera_id, camera_fun_type, face_id, data_source3, panoramic_image_url, portrait_image_url, event) 
                values ({captured_time:DateTime}, {camera_id:String}, {camera_fun_type:String}, {face_id:String}, {data_source3:String}, {panoramic_image_url:String}, {portrait_image_url:String}, {event:String})";

            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "captured_time", Value = new System.DateTime(2022, 1, 1) });
            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "camera_id", Value = "3401040578689" });
            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "camera_fun_type", Value = "2" });
            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "face_id", Value = "3401044900119031678978600000008888" });
            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "event", Value = "UPSERT" });
            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "panoramic_image_url", Value = "panoramic_image_url" });
            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "portrait_image_url", Value = "portrait_image_url" });
            command.Parameters.Add(new ClickHouseDbParameter() { ParameterName = "data_source3", Value = "" });
            command.ExecuteNonQuery();

            using ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);
            long count = session.Queryable<PeopleFace>().Where(t => t.CapturedTime >= new DateTime(2022, 1, 1)).Count();
            Console.WriteLine("count=" + count);
            Assert.IsTrue(count > 0);
        }
        #endregion

        #region 测试插入
        [TestMethod]
        public void Test2Insert2()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            PeopleFace peopleFace = new PeopleFace();
            peopleFace.CapturedTime = new DateTime(2022, 1, 1);
            peopleFace.CameraId = "34010400000000000000";
            peopleFace.FaceId = "340104490011905";
            peopleFace.CameraFunType = "2";
            peopleFace.PanoramicImageUrl = "PanoramicImageUrl";
            peopleFace.PortraitImageUrl = "PortraitImageUrl";
            peopleFace.Event = "UPSERT";
            session.Insert(peopleFace);

            long count = session.Queryable<PeopleFace>().Where(t => t.CapturedTime >= new DateTime(2022, 1, 1)).Count();
            Console.WriteLine("count=" + count);
            Assert.IsTrue(count > 0);
        }
        #endregion

        #region 测试批量插入
        [TestMethod]
        public void Test3BatchInsert()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            Random rnd = new Random();
            string pre = rnd.NextInt64(0, 10000000000).ToString();
            DateTime? time = null;
            List<PeopleFace> peopleFaceList = new List<PeopleFace>();
            for (int i = 0; i < 10; i++)
            {
                PeopleFace peopleFace = new PeopleFace();
                peopleFace.CapturedTime = DateTime.Now;
                peopleFace.CameraId = pre + "_" + i;
                peopleFace.FaceId = "340104490011903" + i;
                peopleFace.CameraFunType = "2";
                peopleFace.PanoramicImageUrl = "PanoramicImageUrl";
                peopleFace.PortraitImageUrl = "PortraitImageUrl";
                peopleFace.Event = "UPSERT";
                peopleFaceList.Add(peopleFace);

                if (time == null) time = peopleFace.CapturedTime;
            }
            session.Insert(peopleFaceList, 100); //设置合理的pageSize

            long count = session.Queryable<PeopleFace>().Where(t => t.CapturedTime >= time && t.CameraId.StartsWith(pre)).Count();
            Console.WriteLine("count=" + count);
            Assert.IsTrue(count > 0);
        }
        #endregion

        #region 测试修改
        [TestMethod]
        public void Test3Update()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            PeopleFace old = session.Queryable<PeopleFace>().Where(t => t.CameraId == "34010400000000000000").First();

            session.AttachOld(old);
            string newExtraInfo = DateTime.Now.ToString("yyyyMMddHHmmss");
            old.ExtraInfo = newExtraInfo;
            session.Update(old);

            Thread.Sleep(100);

            PeopleFace newPeopleFace = session.Queryable<PeopleFace>().Where(t => t.CameraId == "34010400000000000000").First();

            Console.WriteLine(newExtraInfo);
            Console.WriteLine(newPeopleFace.ExtraInfo);
            Assert.IsTrue(newPeopleFace.ExtraInfo == newExtraInfo);
        }
        #endregion

        #region 测试批量修改
        [TestMethod]
        public void Test4BatchUpdate()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            List<PeopleFace> oldList = session.Queryable<PeopleFace>().Where(t => t.CapturedTime > DateTime.Now.AddMinutes(-1)).QueryList<PeopleFace>();

            string newExtraInfo = DateTime.Now.ToString("yyyyMMddHHmmss");
            oldList.ForEach(old =>
            {
                session.AttachOld(old);
                old.ExtraInfo = newExtraInfo;
                session.Update(old);
            });
            //session.Update(oldList); //似乎不支持，错误信息：Multi-statements are not allowed

            Thread.Sleep(100);

            long count = session.Queryable<PeopleFace>().Where(t => t.ExtraInfo == newExtraInfo).Count();

            Console.WriteLine(count + "条已更新");
            Assert.IsTrue(count > 0);
        }
        #endregion

        #region 测试批量修改
        [TestMethod]
        public void Test4BatchUpdate2()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            string newExtraInfo = DateTime.Now.AddYears(-1).ToString("yyyyMMddHHmmss");

            //可以这样批量更新
            session.CreateSql<PeopleFace>("alter table people_face_replica update extra_info=@ExtraInfo where captured_time <= @Time", new { ExtraInfo = newExtraInfo, Time = DateTime.Now }).Execute();

            Thread.Sleep(100);

            long count = session.Queryable<PeopleFace>().Where(t => t.ExtraInfo == newExtraInfo).Count();

            Console.WriteLine(count + "条已更新");
            Assert.IsTrue(count > 0);
        }
        #endregion

        #region 删除
        [TestMethod]
        public void Test9Delete()
        {
            var configurationBuilder = new ConfigurationBuilder().AddJsonFile("config.json");
            var configuration = configurationBuilder.Build();
            string connectionString = configuration.GetConnectionString("DefaultConnection");

            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);
            long count = session.Queryable<PeopleFace>().Where(t => t.CapturedTime > DateTime.Now.AddMinutes(-1)).Count();
            Console.WriteLine("删除前数量=" + count);

            session.CreateSql("captured_time>@Time", new { Time = DateTime.Now.AddDays(-10) }).DeleteByCondition<PeopleFace>();

            Thread.Sleep(100);

            count = session.Queryable<PeopleFace>().Where(t => t.CapturedTime > DateTime.Now.AddMinutes(-1)).Count();
            Console.WriteLine("删除后数量=" + count);

            Assert.IsTrue(count == 0);
        }
        #endregion

        #region 测试参数化查询
        [TestMethod]
        public void Test5Query()
        {
            int queryCount = 10;
            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            List<PeopleFace> list = session.CreateSql("select * from people_face_replica t")
                .Append("where t.captured_time <= @EndTime", DateTime.Now)
                .Append("order by captured_time desc")
                .Append("limit " + queryCount)
                .QueryList<PeopleFace>();

            if (list.Count != queryCount)
            {
                Console.WriteLine(list.Count + " / " + queryCount);
            }
            else
            {
                Console.WriteLine("总数=" + list.Count);
            }
            Assert.IsTrue(list.Count == queryCount);

            list.ForEach(item => Console.WriteLine(ModelToStringUtil.ToString(item)));
        }
        #endregion

        #region 测试参数化查询(参数传匿名对象)
        [TestMethod]
        public void Test5Query2()
        {
            int queryCount = 10;
            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            List<PeopleFace> list = session.CreateSql("select * from people_face_replica t")
                .Append("where t.captured_time <= @EndTime", new { EndTime = DateTime.Now })
                .Append("order by captured_time desc")
                .AppendFormat("limit {0}", queryCount)
                .QueryList<PeopleFace>();

            if (list.Count != queryCount)
            {
                Console.WriteLine(list.Count + " / " + queryCount);
            }
            else
            {
                Console.WriteLine("总数=" + list.Count);
            }
            Assert.IsTrue(list.Count == queryCount);

            list.ForEach(item => Console.WriteLine(ModelToStringUtil.ToString(item)));
        }
        #endregion

        #region 测试参数化查询(Lambda表达式)
        [TestMethod]
        public void Test6QueryByLambda()
        {
            int queryCount = 10;
            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            List<PeopleFace> list = session.Queryable<PeopleFace>()
                .Where(t => t.CapturedTime <= DateTime.Now)
                .OrderByDescending(t => t.CapturedTime)
                .ToPageList(1, queryCount);

            if (list.Count != queryCount)
            {
                Console.WriteLine(list.Count + " / " + queryCount);
            }
            else
            {
                Console.WriteLine("总数=" + list.Count);
            }
            Assert.IsTrue(list.Count == queryCount);

            list.ForEach(item => Console.WriteLine(ModelToStringUtil.ToString(item)));
        }
        #endregion

        #region 测试参数化查询(Lambda表达式同名参数)
        [TestMethod]
        public void Test6QueryByLambda2()
        {
            ISession session = LiteSqlFactory.GetSession();
            session.OnExecuting = (s, p) => Console.WriteLine(s);

            var sql = session.Queryable<PeopleFace>()
                .Where(t => t.CapturedTime <= DateTime.Now && t.CapturedTime >= new DateTime(2022, 1, 1));

            List<PeopleFace> list = session.Queryable<PeopleFace>()
                .Where(t => t.CapturedTime <= DateTime.Now && t.CapturedTime >= new DateTime(2022, 1, 1))
                .Append<PeopleFace>(" union all ", sql)
                .ToList();

            Console.WriteLine("总数=" + list.Count);
            list.ForEach(item => Console.WriteLine(ModelToStringUtil.ToString(item)));
            Assert.IsTrue(list.Count > 0);
        }
        #endregion

    }
}

项目简介

一款同时支持原生SQL和Lambda表达式的轻量级ORM，支持Oracle、MSSQL、MySQL、PostgreSQL、SQLite、Access数据库，以及任意ADO.NET支持的数据库。如有问题加QQ群：497956447。该库不再维护，新库为Dapper.Lite

MIT License
文件大小 1.2 MB
仓库大小 1.3 MB

发行版本

当前项目没有发行版本

贡献者 1

s0611163 @s0611163

开发语言

C# 97.5 %
PLpgSQL 2.5 %

s0611163 / Dapper.LiteSql 8 个月 前同步成功

LiteSql

简介

经典示例

特点

优点

缺点

建议

开发环境

配套Model生成器地址：

支持 ClickHouse 数据库

.NET 6 环境下测试

作者邮箱

使用步骤

配套Model生成器

使用Model生成器生成实体类

实体类示例

修改扩展实体类

扩展实体类示例

增删改查示例

添加

添加并返回ID

批量添加

修改

批量修改

修改时只更新数据有变化的字段

删除

条件删除

查询单个记录

简单查询

条件查询

条件查询(SQL参数支持匿名对象)

分页查询

事务

异步查询

条件查询(使用 ForList 辅助方法)

使用Lambda表达式单表查询

使用Lambda表达式联表分页查询(简单的联表查询，复杂情况请使用原生SQL或原生SQL和Lambda表达式混写)

原生SQL和Lambda表达式混写

拼接子SQL

拼接子查询

直接使用Dapper

手动分表

定义LiteSqlFactory类

数据插入

数据更新

数据删除

数据查询

支持更多数据库

如何实现

定义一个数据库提供者类，实现IProvider接口

定义LiteSqlFactory类

支持ClickHouse

定义ClickHouseProvider类实现IProvider接口

ColumnTypeUtil工具类

定义LiteSqlFactory

实体类

config.json文件

单元测试代码

项目简介

发行版本

贡献者 1

开发语言

s0611163 / Dapper.LiteSql
8 个月前同步成功