Update Spring Boot 2.6.7 and Kotlin 1.6.21

WebWithMyBatisPlus/README.md

-# Spring Web + MyBatis Plus Demo
+# 内容
+
+Spring Web+MyBatisPlus
+
+# 环境
+
+- MyBatisPlus 3.5.1
+- MySQL 8.0.29 (Docker)
+- 数据库名字为`test`
+- 数据表名字为`user`
+- 数据库用户名`root`
+- 数据库密码为`123456`
+
+# 博客
+
+[地址](https://blog.csdn.net/qq_27525611/article/details/108440134)
\ No newline at end of file

WebWithMyBatisPlus/demo/build.gradle.kts

 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
-    id("org.springframework.boot") version "2.4.3"
+    id("org.springframework.boot") version "2.6.7"
     id("io.spring.dependency-management") version "1.0.11.RELEASE"
-    kotlin("jvm") version "1.4.30"
-    kotlin("plugin.spring") version "1.4.30"
+    kotlin("jvm") version "1.6.21"
+    kotlin("plugin.spring") version "1.6.21"
 }
 
 group = "com.example"
 version = "0.0.1-SNAPSHOT"
-java.sourceCompatibility = JavaVersion.VERSION_11
+java.sourceCompatibility = JavaVersion.VERSION_17
 
 configurations {
     compileOnly {
@@ -26,17 +26,17 @@ dependencies {
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
     implementation("org.jetbrains.kotlin:kotlin-reflect")
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
-    implementation("com.baomidou:mybatis-plus-boot-starter:3.4.2")
     developmentOnly("org.springframework.boot:spring-boot-devtools")
     runtimeOnly("mysql:mysql-connector-java")
     annotationProcessor("org.springframework.boot:spring-boot-configuration-processor")
     testImplementation("org.springframework.boot:spring-boot-starter-test")
+    implementation("com.baomidou:mybatis-plus-boot-starter:3.5.1")
 }
 
 tasks.withType<KotlinCompile> {
     kotlinOptions {
         freeCompilerArgs = listOf("-Xjsr305=strict")
-        jvmTarget = "11"
+        jvmTarget = "17"
     }
 }
 

WebWithMyBatisPlus/demo/gradle/wrapper/gradle-wrapper.properties

 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

WebWithMyBatisPlus/demo/gradlew

-#!/usr/bin/env sh
+#!/bin/sh
 
 #
-# Copyright 2015 the original author or authors.
+# Copyright © 2015-2021 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -17,67 +17,101 @@
 #
 
 ##############################################################################
-##
-##  Gradle start up script for UN*X
-##
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
 ##############################################################################
 
 # Attempt to set APP_HOME
+
 # Resolve links: $0 may be a link
-PRG="$0"
-# Need this for relative symlinks.
-while [ -h "$PRG" ] ; do
-    ls=`ls -ld "$PRG"`
-    link=`expr "$ls" : '.*-> \(.*\)$'`
-    if expr "$link" : '/.*' > /dev/null; then
-        PRG="$link"
-    else
-        PRG=`dirname "$PRG"`"/$link"
-    fi
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
 done
-SAVED="`pwd`"
-cd "`dirname \"$PRG\"`/" >/dev/null
-APP_HOME="`pwd -P`"
-cd "$SAVED" >/dev/null
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
 APP_NAME="Gradle"
-APP_BASE_NAME=`basename "$0"`
+APP_BASE_NAME=${0##*/}
 
 # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
-MAX_FD="maximum"
+MAX_FD=maximum
 
 warn () {
     echo "$*"
-}
+} >&2
 
 die () {
     echo
     echo "$*"
     echo
     exit 1
-}
+} >&2
 
 # OS specific support (must be 'true' or 'false').
 cygwin=false
 msys=false
 darwin=false
 nonstop=false
-case "`uname`" in
-  CYGWIN* )
-    cygwin=true
-    ;;
-  Darwin* )
-    darwin=true
-    ;;
-  MINGW* )
-    msys=true
-    ;;
-  NONSTOP* )
-    nonstop=true
-    ;;
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
 esac
 
 CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
@@ -87,9 +121,9 @@ CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 if [ -n "$JAVA_HOME" ] ; then
     if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
         # IBM's JDK on AIX uses strange locations for the executables
-        JAVACMD="$JAVA_HOME/jre/sh/java"
+        JAVACMD=$JAVA_HOME/jre/sh/java
     else
-        JAVACMD="$JAVA_HOME/bin/java"
+        JAVACMD=$JAVA_HOME/bin/java
     fi
     if [ ! -x "$JAVACMD" ] ; then
         die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
@@ -98,7 +132,7 @@ Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
     fi
 else
-    JAVACMD="java"
+    JAVACMD=java
     which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
@@ -106,80 +140,95 @@ location of your Java installation."
 fi
 
 # Increase the maximum file descriptors if we can.
-if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
-    MAX_FD_LIMIT=`ulimit -H -n`
-    if [ $? -eq 0 ] ; then
-        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
-            MAX_FD="$MAX_FD_LIMIT"
-        fi
-        ulimit -n $MAX_FD
-        if [ $? -ne 0 ] ; then
-            warn "Could not set maximum file descriptor limit: $MAX_FD"
-        fi
-    else
-        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
-    fi
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
 fi
 
-# For Darwin, add options to specify how the application appears in the dock
-if $darwin; then
-    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
-fi
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
 
 # For Cygwin or MSYS, switch paths to Windows format before running java
-if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
-    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
-    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
-
-    JAVACMD=`cygpath --unix "$JAVACMD"`
-
-    # We build the pattern for arguments to be converted via cygpath
-    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
-    SEP=""
-    for dir in $ROOTDIRSRAW ; do
-        ROOTDIRS="$ROOTDIRS$SEP$dir"
-        SEP="|"
-    done
-    OURCYGPATTERN="(^($ROOTDIRS))"
-    # Add a user-defined pattern to the cygpath arguments
-    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
-        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
-    fi
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
     # Now convert the arguments - kludge to limit ourselves to /bin/sh
-    i=0
-    for arg in "$@" ; do
-        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
-        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
-
-        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
-            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
-        else
-            eval `echo args$i`="\"$arg\""
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
         fi
-        i=`expr $i + 1`
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
     done
-    case $i in
-        0) set -- ;;
-        1) set -- "$args0" ;;
-        2) set -- "$args0" "$args1" ;;
-        3) set -- "$args0" "$args1" "$args2" ;;
-        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
-        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
-        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
-        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
-        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
-        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
-    esac
 fi
 
-# Escape application args
-save () {
-    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
-    echo " "
-}
-APP_ARGS=`save "$@"`
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
 
-# Collect all arguments for the java command, following the shell quoting and substitution rules
-eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
 
 exec "$JAVACMD" "$@"

WebWithMyBatisPlus/demo/src/main/kotlin/com/example/demo/controller/MyBatisPlusIServiceController.kt

@@ -3,30 +3,35 @@ package com.example.demo.controller
 import com.example.demo.entity.User
 import com.example.demo.service.MyBatisPlusIService
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.web.bind.annotation.*
+import org.springframework.web.bind.annotation.GetMapping
+import org.springframework.web.bind.annotation.PathVariable
+import org.springframework.web.bind.annotation.PostMapping
+import org.springframework.web.bind.annotation.RequestBody
+import org.springframework.web.bind.annotation.RequestMapping
+import org.springframework.web.bind.annotation.RequestParam
+import org.springframework.web.bind.annotation.RestController
 
 @RestController
-@RequestMapping("/iservice")
+@RequestMapping("/iservice/")
 class MyBatisPlusIServiceController {
     @Autowired
-    lateinit var myBatisPlusIService: MyBatisPlusIService
+    private lateinit var myBatisPlusIService: MyBatisPlusIService
 
-    @GetMapping("select")
-    fun select1(@RequestParam id: String): User? = myBatisPlusIService.select(id)
+    @GetMapping("select/id")
+    fun select1(@RequestParam id:Long): User? = myBatisPlusIService.select(id)
 
-    @GetMapping("select/{id}")
-    fun select2(@PathVariable("id") id: String): User? = myBatisPlusIService.select(id)
+    @GetMapping("select/id/{id}")
+    fun select2(@PathVariable("id") id:Long): User? = myBatisPlusIService.select(id)
 
-    @GetMapping("selectAll")
-    fun selectAll(): List<User> = myBatisPlusIService.selectAll()
+    @GetMapping("select/all")
+    fun selectAll(): List<User>? = myBatisPlusIService.selectAll()
 
     @GetMapping("delete")
-    fun delete1(@RequestParam id: String) = myBatisPlusIService.delete(id)
+    fun delete1(@RequestParam id:Long) = myBatisPlusIService.delete(id)
 
     @GetMapping("delete/{id}")
-    fun delete2(@PathVariable("id") id: String) = myBatisPlusIService.delete(id)
+    fun delete2(@PathVariable id:Long) = myBatisPlusIService.delete(id)
 
     @PostMapping("save")
-    fun save(@RequestBody user: User) = myBatisPlusIService.save(user)
-
+    fun save(@RequestBody user:User) = myBatisPlusIService.save(user)
 }
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/kotlin/com/example/demo/controller/MyBatisPlusMapperController.kt

@@ -9,24 +9,23 @@ import org.springframework.web.bind.annotation.*
 @RequestMapping("/mapper")
 class MyBatisPlusMapperController {
     @Autowired
-    lateinit var myBatisPlusMapper: MyBatisPlusMapper
+    private lateinit var myBatisPlusMapper: MyBatisPlusMapper
 
-    @GetMapping("select")
-    fun select1(@RequestParam id: String): User? = myBatisPlusMapper.select(id)
+    @GetMapping("select/id")
+    fun select1(@RequestParam id:Long): User? = myBatisPlusMapper.select(id)
 
-    @GetMapping("select/{id}")
-    fun select2(@PathVariable("id") id: String): User? = myBatisPlusMapper.select(id)
+    @GetMapping("select/id/{id}")
+    fun select2(@PathVariable("id") id:Long): User? = myBatisPlusMapper.select(id)
 
-    @GetMapping("selectAll")
-    fun selectAll(): List<User> = myBatisPlusMapper.selectAll()
+    @GetMapping("select/all")
+    fun selectAll(): List<User>? = myBatisPlusMapper.selectAll()
 
     @GetMapping("delete")
-    fun delete1(@RequestParam id: String) = myBatisPlusMapper.delete(id)
+    fun delete1(@RequestParam id:Long) = myBatisPlusMapper.delete(id)
 
     @GetMapping("delete/{id}")
-    fun delete2(@PathVariable("id") id: String) = myBatisPlusMapper.delete(id)
+    fun delete2(@PathVariable id:Long) = myBatisPlusMapper.delete(id)
 
     @PostMapping("save")
     fun save(@RequestBody user: User) = myBatisPlusMapper.save(user)
-
 }
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/kotlin/com/example/demo/dao/UserMapper.kt

@@ -2,5 +2,9 @@ package com.example.demo.dao
 
 import com.baomidou.mybatisplus.core.mapper.BaseMapper
 import com.example.demo.entity.User
+import org.springframework.stereotype.Service
 
-interface UserMapper: BaseMapper<User>
+@Service
\ No newline at end of file
+// 因为有了MyBatisPlusConfig,不加这个@Service也可以正常运行
+// 加这个@Service主要是防止IDEA出现No Beans警告
+interface UserMapper:BaseMapper<User>
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/kotlin/com/example/demo/dao/UserService.kt

@@ -2,7 +2,5 @@ package com.example.demo.dao
 
 import com.baomidou.mybatisplus.extension.service.IService
 import com.example.demo.entity.User
-import org.springframework.stereotype.Component
 
-@Component
 interface UserService:IService<User>
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/kotlin/com/example/demo/entity/User.kt

 package com.example.demo.entity
 
-class User(var id:String,var username:String,var password:String){
+class User(var id:Long,var username:String,var password:String) {
     override fun toString() = "id:$id\nusername:$username\npassword:$password\n"
 }
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/kotlin/com/example/demo/service/MyBatisPlusIService.kt

@@ -4,16 +4,16 @@ import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl
 import com.example.demo.dao.UserMapper
 import com.example.demo.dao.UserService
 import com.example.demo.entity.User
-import org.springframework.stereotype.Component
 import org.springframework.stereotype.Service
 
 @Service
-class MyBatisPlusIService : ServiceImpl<UserMapper, User>(), UserService {
-    override fun save(user: User) = saveOrUpdate(user)
+class MyBatisPlusIService:ServiceImpl<UserMapper,User>(),UserService {
+    override fun save(user:User) = if(getById(user.id) != null) updateById(user)
+    else super<ServiceImpl>.save(user)
 
-    fun delete(id: String) = removeById(id)
+    fun delete(id:Long) = removeById(id)
 
-    fun select(id: String): User? = getById(id)
+    fun select(id:Long): User? = getById(id)
 
-    fun selectAll(): List<User> = list()
-}
+    fun selectAll(): List<User>? = list()
+}
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/kotlin/com/example/demo/service/MyBatisPlusMapper.kt

@@ -3,7 +3,6 @@ package com.example.demo.service
 import com.example.demo.dao.UserMapper
 import com.example.demo.entity.User
 import org.springframework.beans.factory.annotation.Autowired
-import org.springframework.stereotype.Component
 import org.springframework.stereotype.Service
 
 @Service
@@ -11,15 +10,12 @@ class MyBatisPlusMapper {
     @Autowired
     private lateinit var mapper: UserMapper
 
-    fun save(user: User): Boolean {
-        if (mapper.selectById(user.id) != null)
-            return mapper.updateById(user) == 1
-        return mapper.insert(user) == 1
-    }
+    fun save(user: User) = if (mapper.selectById(user.id) != null) mapper.updateById(user) == 1
+    else mapper.insert(user) == 1
 
-    fun delete(id: String) = (mapper.deleteById(id) == 1)
+    fun delete(id: Long) = mapper.deleteById(id) == 1
 
-    fun select(id: String): User? = mapper.selectById(id)
+    fun select(id: Long): User? = mapper.selectById(id)
 
-    fun selectAll(): List<User> = mapper.selectList(null)
+    fun selectAll(): List<User>? = mapper.selectList(null)
 }
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/resources/application.yml

 spring:
   datasource:
     url: jdbc:mysql://localhost:3306/test
-    username: test
-    password: test
+    username: root
+    password: 123456
\ No newline at end of file
+mybatis-plus:
+  configuration:
+    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
\ No newline at end of file

WebWithMyBatisPlus/demo/src/main/resources/db/CreateTableAndInsertData.sql

+CREATE DATABASE IF NOT EXISTS test;
+
+USE test;
+
+CREATE TABLE user
+(
+    id BIGINT PRIMARY KEY,
+    username VARCHAR(30) NOT NULL,
+    password VARCHAR(30) NOT NULL
+);
+
+INSERT INTO user(id,username,password) VALUES (1,'username1','password1'),(2,'username2','password2');

WebWithMyBatisPlus/demo/src/test/kotlin/com/example/demo/DemoApplicationTests.kt

-package com.example.demo
-
-import org.junit.jupiter.api.Test
-import org.springframework.boot.test.context.SpringBootTest
-
-@SpringBootTest
-class DemoApplicationTests {
-
-    @Test
-    fun contextLoads() {
-    }
-
-}

WebWithMyBatisPlus/demo/src/test/kotlin/com/example/demo/MyBatisPlusIServiceTest.kt

@@ -9,21 +9,21 @@ import org.springframework.boot.test.context.SpringBootTest
 @SpringBootTest
 class MyBatisPlusIServiceTest {
     @Autowired
-    lateinit var myBatisPlusIService: MyBatisPlusIService
+    private lateinit var myBatisPlusIService: MyBatisPlusIService
 
     @Test
     fun save() {
-        myBatisPlusIService.save(User("1", "2", "3"))
+        myBatisPlusIService.save(User(3, "iservice-username-3", "iservice-password-3"))
     }
 
     @Test
     fun delete() {
-        myBatisPlusIService.delete("3")
+        myBatisPlusIService.delete(4)
     }
 
     @Test
     fun select() {
-        println(myBatisPlusIService.select("1"))
+        println(myBatisPlusIService.select(1))
     }
 
     @Test
@@ -31,4 +31,3 @@ class MyBatisPlusIServiceTest {
         println(myBatisPlusIService.selectAll())
     }
 }
-

WebWithMyBatisPlus/demo/src/test/kotlin/com/example/demo/MyBatisPlusMapperTest.kt

@@ -9,21 +9,21 @@ import org.springframework.boot.test.context.SpringBootTest
 @SpringBootTest
 class MyBatisPlusMapperTest {
     @Autowired
-    lateinit var myBatisPlusMapper: MyBatisPlusMapper
+    private lateinit var myBatisPlusMapper: MyBatisPlusMapper
 
     @Test
     fun save() {
-        myBatisPlusMapper.save(User("2", "3", "4"))
+        myBatisPlusMapper.save(User(3, "mapper-username-3", "mapper-password-3"))
     }
 
     @Test
     fun delete() {
-        myBatisPlusMapper.delete("3")
+        myBatisPlusMapper.delete(4)
     }
 
     @Test
     fun select() {
-        println(myBatisPlusMapper.select("1"))
+        println(myBatisPlusMapper.select(1))
     }
 
     @Test