Question

当我运行程序时，它会显示列超出范围的错误。连接正常

例如

updateRecoredtoStudent(15, "Annies","Bot"," Ionia", "1/1/2013","firstname","Anny")

 private static void updateRecordToStudent(int studentid, String firstname, String lastname,String address, String dateofbirth, String cond_col, String cond_val) throws SQLException {

    Connection dbConnection = null;
    PreparedStatement preparedStatement = null;

    String updateTableSQL = "UPDATE student SET 'studentid' = ? 'firstname' = ? 'lastname' = ? 'address' = ? dateofbirth' = ? WHERE ? = ?";
    try {
        dbConnection = getDBConnection();
        preparedStatement = dbConnection.prepareStatement(updateTableSQL);

                    preparedStatement.setInt(1, studentid); 
        preparedStatement.setString(2, firstname); 
                    preparedStatement.setString(3, lastname);
                    preparedStatement.setString(4, address); 
                    preparedStatement.setString(5, dateofbirth);
                    preparedStatement.setString(6, cond_col);
                    preparedStatement.setString(7, cond_val);


        // execute update SQL stetement
        preparedStatement.executeUpdate();

        System.out.println("Record is updated to STUDENT table!");

    } catch (SQLException e) {

        System.out.println(e.getMessage());

    } finally {

        if (preparedStatement != null) {
            preparedStatement.close();
        }

        if (dbConnection != null) {
            dbConnection.close();
        }

    }

}

 Student table contains
-studentid(int-PK)
-Firstname(String)
-lastname(String)
-Address(String)
-Dateofbirth(String)

Answer 1

将您的SQL语法更改为：

UPDATE table_name
SET column1=value1,column2=value2,...
WHERE some_column=some_value;

所以你的SQL UPDATE查询将是：

String updateTableSQL = "UPDATE student SET studentid=?, firstname=?, lastname=?, address=?, dateofbirth=? WHERE " + fieldName + " = ?";

Answer 2

String updateTableSQL = "UPDATE student SET studentid = ?, firstname = ?, lastname = ?, address = ?, dateofbirth = ? WHERE "+cond_col+" = ?";
preparedStatement.setInt(1, studentid); 
preparedStatement.setString(2, firstname); 
preparedStatement.setString(3, lastname);
preparedStatement.setString(4, address); 
preparedStatement.setString(5, dateofbirth);
preparedStatement.setString(6, cond_val);

只能设置列值。如果要传递动态列名，则应使用查询对其进行连接。列名之间还缺少,。

Answer 3

我认为你错了代码声明。请尝试以下方法。

String updateTableSQL = "UPDATE student SET 'studentid' = ? 'firstname' = ? 'lastname' = ? 'address' = ? dateofbirth' = ?  WHERE " + cond_col + "= ?";
try {
    dbConnection = getDBConnection();
    preparedStatement = dbConnection.prepareStatement(updateTableSQL);

    preparedStatement.setInt(1, studentid); 
    preparedStatement.setString(2, firstname); 
    preparedStatement.setString(3, lastname);
    preparedStatement.setString(4, address); 
    preparedStatement.setString(5, dateofbirth);
    preparedStatement.setString(6, cond_val);

SQL异常：索引超出范围

3 个答案: