无法插入数据java mysql [关闭]

Posted 2023-05-09

【中文标题】无法插入数据java mysql [关闭]

【英文标题】：Can't insert data java mysql [closed]

【发布时间】：2021-01-08 13:09:29

【问题描述】：

我有一个问题，我无法将数据插入我使用 Java 和 mysql 的数据库中

try 
        String query1 = "insert into Client(Codecli,Nom,Ville,Datenais,Solde,Password) values(?,?,?,?,?,?)";
        PreparedStatement statement = connection.prepareStatement(query1);
        statement.setString(1, num.getText());
        statement.setString(2, nomField.getText());
        statement.setString(3, villeField.getText());
        statement.setDate(4, null);
        statement.setDouble(5, 0.0);
        statement.setString(6, passwordField.getText());
        statement.executeUpdate(query1);
        connection.close();
     catch (Exception e) 
        e.printStackTrace();
    

显示这个错误

java.sql.SQLException: Parameter index out of range (2 > number of parameters, which is 1).

【问题讨论】：

statement.executeUpdate(query1); 错误，请参阅文档；必须有不带参数执行的方法

谢谢！我删除了参数并且它起作用了

【参考方案1】：

// prepared statements must be closed, so use a try-with-resources (or a try / catch / finally) 
// connection should not be closed in the try block because throwing an exception will leave it open.
try (PreparedStatement statement = connection.prepareStatement(query1);connection) 
    statement.setString(1, num.getText());
    statement.setString(2, nomField.getText());
    statement.setString(3, villeField.getText());
    statement.setDate(4, null);
    statement.setDouble(5, 0.0);
    statement.setString(6, passwordField.getText());
    
    // no parameters in executeUpdate() (your original problem)
    int result = statement.executeQuery();
    // returns the number of rows affected --- so a 0 = didn't work

 catch (Exception ex) 
    ex.printStackTrace();

完整的免责声明 - 我没有测试此代码，但我 99% 确定如果您进行这些更改，它会起作用。

【讨论】：

谢谢！我刚刚删除了 executeUpdate 中的参数，它起作用了