MySQL查询可在PhpMyAdmin中使用，但不能在JAVA Eclipse中使用 [英] MySQL Query works in PhpMyAdmin but not in JAVA Eclipse

问题描述

我是Java编程的完全新手，但我正在努力.我已经进行了广泛的搜索，但是即使许多新手程序员都遇到了同样的问题，我也无法弄清楚.

I'm a complete novice in Java programming but I'm hammering away. I have searched extensively but I can't figure it out even though many fellow beginner programmers have had the same problem..

我遇到的是Java<> MySQL问题，我无法解决这个问题！

I have is this Java <> MySQL problem, and I can't wrap my head around it!

如果我在phpMyAdmin中执行此查询:

If I execute this query in phpMyAdmin:

SET count = 0; UPDATE tablename SET table_id = count:= count + 1;  
ALTER TABLE tablename AUTO_INCREMENT = 1;

它可以按我想要的方式工作，重置ID(在删除一行之后)，它可能不是最优雅的解决方案，但可以完成工作.

It works as I want it to, reset ID (after I delete a row) it may not be the most elegant solutions but it gets the job done.

但是，一旦我从eclipse执行相同的查询，我的控制台就会像圣诞树一样亮起来，并且我得到一个:

But as soon as I execute the same query from eclipse my console lights up like a Christmas tree and I get a:

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:您有一个 您的SQL语法错误；检查与您的手册相对应的手册 MySQL服务器版本，用于在'UPDATE附近使用的正确语法 tablename SET table_id = @count:= @count + 1; ALTER TABLE表名 AU'在第1行

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 'UPDATE tablename SET table_id = @count:= @count + 1; ALTER TABLE tablename AU' at line 1

错误...请检查我的语法.它可以在phpMyAdmin中工作. 我的Eclipse Java方法:

Error... check my syntax. It works in phpMyAdmin. My Eclipse Java method:

public void resetDBID(){
    try{
        // query to reset menu_id manly after delete row
        Statement statement = con.connection.createStatement();
        String sset;
        sset =  "SET @count = 0; "
                + "UPDATE afhaalmenus SET menu_id = @count:= @count + 1; "
                + "ALTER TABLE afhaalmenus AUTO_INCREMENT = 1;";

        statement.execute(sset);

    } catch(SQLException ex){
        String message = "rest ID fail";
        JOptionPane.showMessageDialog(null, message, "method fail", JOptionPane.INFORMATION_MESSAGE);
        ex.printStackTrace();
    }
}

我在这里想念的是什么?还是做错了... 预先感谢您的所有帮助！

What is it that I'm missing here? Or doing wrong... Thanks in advance for all of your help!

推荐答案

您可以使用addBatch

You can use addBatch

String s1 = "SET @count = 0";
String s2 = ...

try {
// query to reset menu_id manly after delete row
     connection = database.getConnection();
     Statement statement = connection.createStatement();
     statement.addBatch(s1);
     statement.addBatch(s2);    
     statement.addBatch(s2);   
     s.executeBatch();
     connection.commit();
} catch (SQLException e) {
    connection.rollback();
    throw e;
} finally {
    close(statement);
    close(connection);
}

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