package com.lian.lesson3;
import com.lian.lesson2.utils.JDBCUtils;
import java.sql.*;
public class TestInsert {
public static void main(String[] args) {
Connection connection = null;
PreparedStatement preparedStatement = null;
// ResultSet resultSet = null;
try {
connection = JDBCUtils.getConnection();
//区别
//使用问号？占位符代替函数
String sql = "INSERT INTO student(id, name, age) values (?,?,?)";
preparedStatement = connection.prepareStatement(sql);//预编译SQL，先写sql，然后不执行
//手动给参数赋值
preparedStatement.setInt(1,9);//id
preparedStatement.setString(2,"tiny");//name
preparedStatement.setInt(3,14);//age
//执行
int i = preparedStatement.executeUpdate(sql);
if (i > 0){
System.out.println("insert success");
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
JDBCUtils.release(connection,preparedStatement,null);
}
}
}
这是之前学习到的preparedStatement使用代码，但是如果是以上的代码，运行会报错：
java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?,?,?)' at line 1
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
at com.mysql.cj.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1333)
at com.mysql.cj.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2106)
at com.mysql.cj.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1243)
at com.lian.lesson3.TestInsert.main(TestInsert.java:27)
原因在于 int i = preparedStatement.executeUpdate(sql);语句中不需要再额外添加sql参数
修改正确后代码
package com.lian.lesson3;
import com.lian.lesson2.utils.JDBCUtils;
import java.sql.*;
public class TestInsert {
public static void main(String[] args) {
Connection connection = null;
PreparedStatement preparedStatement = null;
// ResultSet resultSet = null;
try {
connection = JDBCUtils.getConnection();
//区别
//使用问号？占位符代替函数
String sql = "INSERT INTO student(id, name, age) values (?,?,?)";
preparedStatement = connection.prepareStatement(sql);//预编译SQL，先写sql，然后不执行
//手动给参数赋值
preparedStatement.setInt(1,9);//id
preparedStatement.setString(2,"tiny");//name
preparedStatement.setInt(3,14);//age
//执行
int i = preparedStatement.executeUpdate();
if (i > 0){
System.out.println("insert success");
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
JDBCUtils.release(connection,preparedStatement,null);
}
}
}
Original: https://www.cnblogs.com/ancientlian/p/14417165.html
Author: Lian_tiam
Title: PreparedStatement报错问题
原创文章受到原创版权保护。转载请注明出处：https://www.johngo689.com/643481/
转载文章受原作者版权保护。转载请注明原作者出处！