使用JDBC准备语句批量插入

2024-04-20 20:39:04 21

将一组INSERT语句分组并立即执行它们被称为批处理插入。

使用PreparedStatement对象进行批量插入

要使用PreparedStatement对象执行一批插入语句-

创建PreparedStatement-使用prepareStatement()方法创建PreparedStatement对象。通过带有占位符“？”的插入查询而不是将值作为此方法的参数。

PreparedStatement pstmt = con.prepareStatement("INSERT INTO Sales VALUES (?, ?, ?, ?, ?)");

设置值的占位符-使用setXXX()方法（SETINT()SetString()，setFloat()等...）设置的值在PrepareStatement的地方持有人-

pstmt.setString(1, "KeyBoard");
pstmt.setString(2, "Amith");
pstmt.setString(3, "January");
pstmt.setInt(4, 1000);
pstmt.setString(5, "Hyderabad");

将语句添加到批处理中-将记录的值设置为占位符后，使用PreparedStatement接口的addBatch()方法将记录添加到批处理中-

pstmt.setString(1, "KeyBoard");
pstmt.setString(2, "Amith");
pstmt.setString(3, "January");
pstmt.setInt(4, 1000);
pstmt.setString(5, "Hyderabad");
pstmt.addBatch();
pstmt.setString(1, "Earphones");
pstmt.setString(2, "Sumith");
pstmt.setString(3, "March");
pstmt.setInt(4, 500);
pstmt.setString(5, "Vishakhapatnam");
pstmt.addBatch();
pstmt.setString(1, "Mouse");
pstmt.setString(2, "Sudha");
pstmt.setString(3, "September");
pstmt.setInt(4, 500);
pstmt.setString(5, "Vishakhapatnam");
pstmt.addBatch();

执行批处理-最后，使用executeBatch()PreparedStatement接口的方法执行批处理。

pstmt.executeBatch();

使用批处理插入，我们可以减少通信开销并提高Java应用程序的性能。

注–在将语句添加到批处理之前，您需要使用con.setAutoCommit(false)关闭自动提交，并且在执行批处理之后，需要使用con.commit()方法保存更改。

示例

让我们使用CREATE语句在MySQL数据库中创建一个名称为Dispatches的表，如下所示-

CREATE table Dispatches (
   Product_Name, varchar(255)
   Name_Of_Customer, varchar(255)
   Month_Of_Dispatch, varchar(255)
   Price, int(11)
   Location, varchar(255)
);

下面的JDBC程序尝试使用Statement 对象批量执行一堆INSERT语句。

示例

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.Statement;
public class BatchInserts_PreparedStatement {
   public static void main(String args[])throws Exception {
      //获得连接
      String mysqlUrl = "jdbc:mysql://localhost/testDB";
      Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
      System.out.println("Connection established......");
      //创建一个Statement对象
      Statement stmt = con.createStatement();
      //设置自动提交false-
      con.setAutoCommit(false);
      PreparedStatement pstmt = con.prepareStatement("INSERT INTO Sales VALUES (?, ?, ?, ?, ?)");
      pstmt.setString(1, "KeyBoard");
      pstmt.setString(2, "Amith");
      pstmt.setString(3, "January");
      pstmt.setInt(4, 1000);
      pstmt.setString(5, "Hyderabad");
      pstmt.addBatch();
      pstmt.setString(1, "Earphones");
      pstmt.setString(2, "Sumith");
      pstmt.setString(3, "March");
      pstmt.setInt(4, 500);
      pstmt.setString(5, "Vishakhapatnam");
      pstmt.addBatch();
      pstmt.setString(1, "Mouse");
      pstmt.setString(2, "Sudha");
      pstmt.setString(3, "September");
      pstmt.setInt(4, 500);
      pstmt.setString(5, "Vishakhapatnam");
      pstmt.addBatch();
      //执行批处理
      stmt.executeBatch();
      //保存更改
      con.commit();
      System.out.println("Records inserted......");
   }
}

输出结果

Connection established......
Records inserted......

如果您验证表的内容，则可以找到新插入的记录为-

+--------------+------------------+-------------------+-------+----------------+
| Product_Name | Name_Of_Customer | Month_Of_Dispatch | Price | Location       |
+--------------+------------------+-------------------+-------+----------------+
| KeyBoard     | Amith            | January           | 1000  | Hyderabad      |
| Earphones    | SUMITH           | March             | 500   | Vishakhapatnam |
| Mouse        | Sudha            | September         | 200   | Vijayawada     |
+--------------+------------------+-------------------+-------+----------------+

使用JDBC准备语句批量插入

使用PreparedStatement对象进行批量插入

示例

示例

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