java - 调试MysqlDataTruncation异常

Question

我使用以下例程将信息存储在数据库中:

try{
connection = cpds.getConnection();
pstmt = connection.prepareStatement("select setSomeData(?,?)");
//set data to the statement
res = pstmt.executeQuery();
//process data retrieved
} catch (SQLException ex) {
        System.out.println("SQLException: " + ex);
        ex.printStackTrace();
        return null;
    } finally {
        try {
            pstmt.close();
            connection.close();
        } catch (SQLException ex) {
    }
}

但有时我会遇到此异常:

SQLException: com.mysql.jdbc.MysqlDataTruncation: Data truncation: BIGINT UNSIGNED value is out of range in '(tstmp@5 - lastEvent@11)'
com.mysql.jdbc.MysqlDataTruncation: Data truncation: BIGINT UNSIGNED value is out of range in '(tstmp@5 - lastEvent@11)'
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
at com.mysql.jdbc.MysqlIO.nextRowFast(MysqlIO.java:2066)
at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1922)
at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:3414)
at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:481)
at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:3120)
at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2288)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2709)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2134)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2300)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:116)

是否可以了解有关异常的更多信息，例如受影响的列和我尝试存储的值？

例如，对于异常:.MySQLTransactionRollbackException:尝试获取锁定时发现死锁；

查询SHOW ENGINE INNODB STATUS非常有用...

Answer 1

除了 SQLSTATE 以及相应的 MySQL 错误代码和消息之外，通过 JDBC 可获得的调试信息非常少。

https://dev.mysql.com/doc/refman/5.5/en/error-messages-server.html

<小时/>

对于第一个异常，最可能的解释是，它是由 MySQL 在尝试将负值存储到 UNSIGNED 整数数据类型时引发的警告(或错误)引起的。

举个例子:

CREATE TABLE foo (val BIGINT UNSIGNED);
INSERT INTO foo (val) VALUES (-4);

0 row(s) affected
Total Time     : 0.030 sec
--------------------------------------------------

1 row(s) affected, 1 warning(s)
Total Time     : 0 sec

Warning Code : 1264
Out of range value for column 'val' at row 1

<小时/>

对于另一个异常，这是有关正在引发的 MySQL 错误的信息:

Error: 1213 SQLSTATE: 40001 (ER_LOCK_DEADLOCK)
Message: Deadlock found when trying to get lock; try restarting transaction

对于 InnoDB 表遇到的错误，是的，SHOW ENGINE INNODB STATUS 语句的输出可以提供一些见解。但该信息适用于整个数据库，不一定特定于遇到错误的 session 。