mysql大批量插入数据的正确解决方法

List<User> list = findAllUser();
Statement stat = conn.createStatement();
for (User u : list) {
	String sql = "INSERT INTO t_user (uname,age,email) VALUE ('"
                  +u.getUsername()+"',"+u.getAge()+",'"+u.getEmail()+"')";
	stat.addBatch(sql);
}
stat.executeBatch();
INSERT INTO t_user
      (uname,upwd,age,email)
VALUE 
      ('root1','123456',15,'root111@qq.com'),
      ('root2','123456',18,'root222@qq.com')，
      ('root3','123456',26,'root333@qq.com')，
      ....

@Test
public void testInsert() {
	UserDAO dao = new UserDAO();
	long t1 = System.currentTimeMillis();
	for(int i=0;i<10000000;i++) {
	    dao.insert(
                "INSERT INTO t_user (uname,pwd,age,email) VALUES ('root','123',15,'root@qq.com')");
	}
	long t2 = System.currentTimeMillis();
	int time = (int) ((t2-t1)/1000);
	System.out.println("共耗时：" + time +"秒")
}

@Test
public void testBatch() throws SQLException {
	Connection conn = DBUtils.getConn();
	Statement stat = conn.createStatement();
long t1 = System.currentTimeMillis();
	for(int k=0;k<100;k++) {
	for (int i=0;i<1000;i++) {
			StringBuilder sql =new StringBuilder();
			sql.append("INSERT INTO t_user (uname,pwd,age,email) VALUES ");
			for (int j = 0; j < 100; j++) {				sql.append("('root','123',15,'root@qq.com'),");
			}
			stat.addBatch(sql.toString().substring(0,sql.lastIndexOf(",")))
		}
		stat.executeBatch();
	}
	long t2 = System.currentTimeMillis();
	int time = (int) ((t2-t1)/1000);
	System.out.println("共耗时：" + time +"秒");
}