教你如何6秒钟往MySQL插入100万条数据!然后删库跑路!
由于我用的mysql 8版本,所以增加了Timezone,然后就可以了
前提是要自己建好库和表。 数据库test, 表user, 三个字段: u_id、u_name、u_pwd,然后主键自增
conn = DriverManager.getConnection("jdbc:mysql:///test?" + "&rewriteBatchedStatements=true&serverTimezone=Asia/Shanghai", "root", "123456");
运行结果如下:
代码如下:
package rs.dms.test; import java.sql.*; /**
* @author : Bei-Zhen
* @date : 2020-08-24 0:43
*/
public class JDBC2 { //static int count = 0; public static void main(String[] args) { long start = System.currentTimeMillis();
conn();
long end = System.currentTimeMillis();
System.out.println("耗时:" + (end - start) / 1000 + "秒");
} public static void conn() {
//1.导入驱动jar包
//2.注册驱动(mysql5之后的驱动jar包可以省略注册驱动的步骤)
//Class.forName("com.mysql.jdbc.Driver");
//3.获取数据库连接对象
Connection conn = null;
PreparedStatement pstmt = null;
{
try {
//"&rewriteBatchedStatements=true",一次插入多条数据,只插入一次
conn = DriverManager.getConnection("jdbc:mysql:///test?" + "&rewriteBatchedStatements=true&serverTimezone=Asia/Shanghai", "root", "123456");
//4.定义sql语句
String sql = "insert into user values(default,?,?)";
//5.获取执行sql的对象PreparedStatement
pstmt = conn.prepareStatement(sql);
//6.不断产生sql
for (int i = 0; i < 1000000; i++) {
pstmt.setString(1, (int) (Math.random() * 1000000) + "");
pstmt.setString(2, (int) (Math.random() * 1000000) + "");
pstmt.addBatch();
}
//7.往数据库插入一次数据
pstmt.executeBatch();
System.out.println("添加1000000条信息成功!"); } catch (SQLException e) {
e.printStackTrace();
} finally {
//8.释放资源
//避免空指针异常
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
} if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
} } }