Java如何在JDBC中创建批处理更新？
批处理语句可用于在数据库操作中作为一个单元执行多个更新命令。数据库中的该语句不是一个接一个地执行，而是一次执行。在某些情况下，使用批处理更新可能比分别执行命令更有效。
在此示例中，显示了如何创建批处理命令以将一些产品数据插入数据库。
package org.nhooo.example.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCBatchExample {
private static final String URL = "jdbc:mysql://localhost/nhooo";
private static final String USERNAME = "root";
private static final String PASSWORD = "";
public static void main(String[] args) {
try (Connection connection =
DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
//开启自动提交模式
connection.setAutoCommit(false);
try (Statement statement = connection.createStatement()) {
//和一些批处理将一些产品信息插入
//产品表
statement.addBatch("INSERT INTO products (code, name) " +
"VALUE ('P0000006', 'Championship Manager')");
statement.addBatch("INSERT INTO products (code, name) " +
"VALUE ('P0000007', 'Transport Tycoon Deluxe')");
statement.addBatch("INSERT INTO products (code, name) " +
"VALUE ('P0000008', 'Roller Coaster Tycoon 3')");
statement.addBatch("INSERT INTO products (code, name) " +
"VALUE ('P0000009', 'Pro Evolution Soccer')");
//要执行批处理命令，我们必须调用executeBatch()
//方法。
int[] updateCounts = statement.executeBatch();
//提交交易
connection.commit();
} catch (SQLException e) {
connection.rollback();
e.printStackTrace();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/8.0.17/mysql-connector-java-8.0.17.jar -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>