MySQL一次性插入十万条数据

在写sql语句的时候,总是报错,原来是’'单引号没有加

拼接语句的后半部分,之前仅仅是简单的""双引号拼接,报一些莫名其妙的错误,一直说sql语句有问题,但是看不出来,原来是’'单引号没有加.

完整代码

 	@Test
    public void InsertDB() throws ClassNotFoundException, SQLException {
        final String url = "jdbc:mysql://localhost:3306/day10?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false";
        final String driverClassName = "com.mysql.jdbc.Driver";
        final String username = "root";
        final String password = "root";
        Connection conn = null;
        Class.forName(driverClassName);//指定连接类型
        conn = DriverManager.getConnection(url, username, password);//获取连接

        //sql前缀
        String prefix = "insert into class10 (name,age,gender) values  ";
        //开始写后缀
        Random random = new Random();
        //设置事务非自动提交
        conn.setAutoCommit(false);
        Statement st = conn.createStatement();
        for (int i = 0; i <10 ; i++) {
            StringBuffer suffix = new StringBuffer();
            //第一次提交步长
            for (int j = 0; j <1000 ; j++) {
                suffix.append("('"+"勾指起誓"+"','"+ "32"+"','"+"男"+"') ");
                //完整sql语句
                String sql = prefix + suffix;
                st.executeUpdate(sql);
                conn.commit();
                suffix = new StringBuffer();
            }

        }
        st.close();
        conn.close();
    }