add java insert example (#11019)

* java insert example

* sql upper case

* java stmt example

* java stmt exmaple

docs-cn/06-insert-data/01-sql-writing.mdx

@@ -84,7 +84,7 @@ INSERT INTO d1001 VALUES (1538548685000, 10.3, 219, 0.31) (1538548695000, 12.6,
 :::note
 
 1. 无论 RESTFful 方式建立连接还是本地驱动方式建立连接，以上示例代码都能正常工作。
-2. 唯一需要注意的是：由于 RESTful 接口无状态， 不能使用 `use db` 语句来切换数据库。
+2. 唯一需要注意的是：由于 RESTful 接口无状态， 不能使用 `use db` 语句来切换数据库, 所以在上面示例中使用了`dbName.tbName`指定表名。
 
 :::
 
@@ -120,4 +120,4 @@ TDengine 也提供了支持参数绑定的 Prepare API，与 MySQL 一样，这
 
 只有使用本地驱动方式连接连接，才能使用动态绑定工具。
 
-:::
+:::
\ No newline at end of file

docs-cn/06-insert-data/_java_sql.mdx

+```java
+{{#include docs-examples/java/src/main/java/com/taos/example/RestInsertExample.java:insert}}
+```
\ No newline at end of file

docs-cn/06-insert-data/_java_stmt.mdx

+```java
+{{#include docs-examples/java/src/main/java/com/taos/example/StmtInsertExample.java:insert}}
+```

docs-examples/java/src/main/java/com/taos/example/RestInsertExample.java

+package com.taos.example;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.Arrays;
+import java.util.List;
+
+
+public class RestInsertExample {
+    private static Connection getConnection() throws SQLException {
+        String jdbcUrl = "jdbc:TAOS-RS://localhost:6041?user=root&password=taosdata";
+        return DriverManager.getConnection(jdbcUrl);
+    }
+
+    private static List<String> getRawData() {
+        return Arrays.asList(
+                "d1001,2018-10-03 14:38:05.000,10.30000,219,0.31000,Beijing.Chaoyang,2",
+                "d1001,2018-10-03 14:38:15.000,12.60000,218,0.33000,Beijing.Chaoyang,2",
+                "d1001,2018-10-03 14:38:16.800,12.30000,221,0.31000,Beijing.Chaoyang,2",
+                "d1002,2018-10-03 14:38:16.650,10.30000,218,0.25000,Beijing.Chaoyang,3",
+                "d1003,2018-10-03 14:38:05.500,11.80000,221,0.28000,Beijing.Haidian,2",
+                "d1003,2018-10-03 14:38:16.600,13.40000,223,0.29000,Beijing.Haidian,2",
+                "d1004,2018-10-03 14:38:05.000,10.80000,223,0.29000,Beijing.Haidian,3",
+                "d1004,2018-10-03 14:38:06.500,11.50000,221,0.35000,Beijing.Haidian,3"
+        );
+    }
+
+
+    /**
+     * The generated SQL is:
+     * INSERT INTO power.d1001 USING power.meters TAGS(Beijing.Chaoyang, 2) VALUES('2018-10-03 14:38:05.000',10.30000,219,0.31000)
+     *         power.d1001 USING power.meters TAGS(Beijing.Chaoyang, 2) VALUES('2018-10-03 14:38:15.000',12.60000,218,0.33000)
+     *         power.d1001 USING power.meters TAGS(Beijing.Chaoyang, 2) VALUES('2018-10-03 14:38:16.800',12.30000,221,0.31000)
+     *         power.d1002 USING power.meters TAGS(Beijing.Chaoyang, 3) VALUES('2018-10-03 14:38:16.650',10.30000,218,0.25000)
+     *         power.d1003 USING power.meters TAGS(Beijing.Haidian, 2) VALUES('2018-10-03 14:38:05.500',11.80000,221,0.28000)
+     *         power.d1003 USING power.meters TAGS(Beijing.Haidian, 2) VALUES('2018-10-03 14:38:16.600',13.40000,223,0.29000)
+     *         power.d1004 USING power.meters TAGS(Beijing.Haidian, 3) VALUES('2018-10-03 14:38:05.000',10.80000,223,0.29000)
+     *         power.d1004 USING power.meters TAGS(Beijing.Haidian, 3) VALUES('2018-10-03 14:38:06.500',11.50000,221,0.35000)
+     */
+    private static String getSQL() {
+        StringBuilder sb = new StringBuilder("INSERT INTO ");
+        for (String line : getRawData()) {
+            String[] fields = line.split(",");
+            sb.append("power." + fields[0]).append(" USING power.meters TAGS(")
+                    .append(fields[5]).append(", ")
+                    .append(fields[6])
+                    .append(") VALUES(")
+                    .append('\'').append(fields[1]).append('\'').append(",")
+                    .append(fields[2]).append(",")
+                    .append(fields[3]).append(",")
+                    .append(fields[4]).append(") ");
+        }
+        return sb.toString();
+    }
+
+    public static void insertData() throws SQLException {
+        try(Connection conn = getConnection()) {
+            try (Statement stmt = conn.createStatement()) {
+                stmt.execute("CREATE DATABASE power KEEP 3650");
+                stmt.execute("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) " +
+                        "TAGS (location BINARY(64), groupId INT)");
+                String sql = getSQL();
+                int rowCount = stmt.executeUpdate(sql);
+                System.out.println("rowCount=" + rowCount); // rowCount=8
+            }
+        }
+    }
+
+    public static void main(String[] args) throws SQLException {
+        insertData();
+    }
+}

docs-examples/java/src/main/java/com/taos/example/RestInsertExmaple.java

-package com.taos.example;
-
-public class RestInsertExmaple {
-}

docs-examples/java/src/main/java/com/taos/example/StmtInsertExample.java

+package com.taos.example;
+
+import com.taosdata.jdbc.TSDBPreparedStatement;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class StmtInsertExample {
+    private static Connection getConnection() throws SQLException {
+        String jdbcUrl = "jdbc:TAOS://localhost:6030?user=root&password=taosdata";
+        return DriverManager.getConnection(jdbcUrl);
+    }
+
+    private static List<String> getRawData() {
+        return Arrays.asList(
+                "d1001,2018-10-03 14:38:05.000,10.30000,219,0.31000,Beijing.Chaoyang,2",
+                "d1001,2018-10-03 14:38:15.000,12.60000,218,0.33000,Beijing.Chaoyang,2",
+                "d1001,2018-10-03 14:38:16.800,12.30000,221,0.31000,Beijing.Chaoyang,2",
+                "d1002,2018-10-03 14:38:16.650,10.30000,218,0.25000,Beijing.Chaoyang,3",
+                "d1003,2018-10-03 14:38:05.500,11.80000,221,0.28000,Beijing.Haidian,2",
+                "d1003,2018-10-03 14:38:16.600,13.40000,223,0.29000,Beijing.Haidian,2",
+                "d1004,2018-10-03 14:38:05.000,10.80000,223,0.29000,Beijing.Haidian,3",
+                "d1004,2018-10-03 14:38:06.500,11.50000,221,0.35000,Beijing.Haidian,3"
+        );
+    }
+
+    private static ArrayList<Long> tsToLongArray(String ts) {
+        ArrayList<Long> result = new ArrayList<>();
+        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
+        LocalDateTime localDateTime = LocalDateTime.parse(ts, formatter);
+        result.add(localDateTime.toInstant(ZoneOffset.of("+8")).toEpochMilli());
+        return result;
+    }
+
+    private static <T> ArrayList<T> toArray(T v) {
+        ArrayList<T> result = new ArrayList<>();
+        result.add(v);
+        return result;
+    }
+
+    // ANCHOR: insert
+    private static void createTable(Connection conn) throws SQLException {
+        try (Statement stmt = conn.createStatement()) {
+            stmt.execute("CREATE DATABASE power KEEP 3650");
+            stmt.executeUpdate("USE power");
+            stmt.execute("CREATE STABLE meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) " +
+                    "TAGS (location BINARY(64), groupId INT)");
+        }
+    }
+
+    private static void insertData() throws SQLException {
+        try (Connection conn = getConnection()) {
+            createTable(conn);
+            String psql = "INSERT INTO ? USING meters TAGS(?, ?) VALUES(?, ?, ?, ?)";
+            try (TSDBPreparedStatement pst = (TSDBPreparedStatement) conn.prepareStatement(psql)) {
+                for (String line : getRawData()) {
+                    String[] ps = line.split(",");
+                    // bind table name and tags
+                    pst.setTableName(ps[0]);
+                    pst.setTagString(0, ps[5]);
+                    pst.setTagInt(1, Integer.valueOf(ps[6]));
+                    // bind values
+                    pst.setTimestamp(0, tsToLongArray(ps[1]));
+                    pst.setFloat(1, toArray(Float.valueOf(ps[2])));
+                    pst.setInt(2, toArray(Integer.valueOf(ps[3])));
+                    pst.setFloat(3, toArray(Float.valueOf(ps[4])));
+                    pst.columnDataAddBatch();
+                }
+                pst.columnDataExecuteBatch();
+            }
+        }
+    }
+    // ANCHOR_END: insert
+
+    public static void main(String[] args) throws SQLException {
+        insertData();
+    }
+}