JDBC，MySQL-带PreparedStatement executeUpdate的DML错误
[英]JDBC, MySQL - DML Error with PreparedStatement executeUpdate
问题描述
I have two tables. 
我有两张桌子。 I need to get some column values in a List from second table against col2 and update in the first table on the fly in a loop. 我需要针对col2从第二个表中获取列表中的某些列值，并在循环中动态地对第一个表进行更新。
Code : 代码：
int ownerUpdateCount = 0;
PreparedStatement statement = null;
Connection connection = null;
try{
while(featuresIT.hasNext()){
String feature = (String) featuresIT.next();
String updateOwnerQuery = "UPDATE `regression_reports` "
+ "JOIN `feature_testbed_owner_mapping_628` ON (`regression_reports`.Feature='"
+ feature
+ "' AND `regression_reports`.Feature = `feature_testbed_owner_mapping_628`.feature_as_on_webpage) "
+ "SET `regression_reports`.Owner = `feature_testbed_owner_mapping_628`.owner";
//logger.debug("\n updateOwnerQuery : " + updateOwnerQuery);
connection = dataSource.getConnection();
connection.setAutoCommit(true);
statement = connection.prepareStatement(updateOwnerQuery);
//ownerUpdateCount +=
ownerUpdateCount = statement.executeUpdate();
System.out.println(feature + " ownerUpdateCount : " + ownerUpdateCount);
}
logger.debug("\n ownerUpdateCount : " + ownerUpdateCount);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try { if(null!=statement)statement.close();} catch (SQLException e)
{e.printStackTrace();}
try { if(null!=connection)connection.close();} catch (SQLException e)
{e.printStackTrace();}
}
Error : 错误：
java.sql.SQLException: Can not issue data manipulation statements with executeQuery().
This error occurs only in the first iteration of the loop. 该错误仅在循环的第一次迭代中发生。 Any suggestion to debug why its happening. 任何有关调试其原因的建议。
String updateFeaturesQuery = "INSERT INTO `regression_reports` "
+ "(Feature, `Report`, `P`, `F`, `Remarks`) VALUES ('"
+ feature + "','" + report + "'," + pass + "," + fail
+ ") " + "ON DUPLICATE KEY UPDATE `Report` = '"
+ report + "', `P` = " + pass + ", `F`= " + fail
+ ", `Remarks` = " + remarks + ";";
connection = dataSource.getConnection();
statement = connection.prepareStatement(updateFeaturesQuery);
Line#73
featureUpdateCount = statement.executeUpdate(updateFeaturesQuery);
Error : 错误：
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax;
The above execution gives this error. 上面的执行给出了这个错误。 Executing the same query manually doesn't throw me any error. 手动执行相同的查询不会引发任何错误。
3 个解决方案
解决方案1
1 已采纳 2014-03-20 04:13:44
Your column Remarks is missing entirely here, 您的专栏“ Remarks在这里完全丢失，
// No `Remarks` even though you included it in the list. `F`, `Remarks`)
"," + fail /* + Remarks! */ + ") " + "ON DUPLICATE KEY UPDATE `Report` = '"
Your column Remarks is not escaped here, 您的专栏“ Remarks不在此处转义，
+ ", `Remarks` = '" + remarks + "';";
But you should use bind parameters or String StringEscapeUtils#escapeSql(String) because your code is vulnerable to sql injection . 但是您应该使用绑定参数或String StringEscapeUtils＃escapeSql（String），因为您的代码容易受到sql注入的攻击。
解决方案2
0 2014-03-20 04:21:29
Re the second problem - you are inserting four values into five columns. 再说第二个问题-您将四个值插入五列。 You forgot "Remarks". 您忘记了“备注”。
Re the first problem - you haven't shown us the right piece of code. 关于第一个问题-您没有给我们展示正确的代码。
解决方案3
0 2014-03-20 04:26:45
you doing some mistake you sql query, like ; 您在执行sql查询时出错，例如; and you are missing value to get as like Remarks . 并且您缺少获得像Remarks一样的价值。
STRING updateFeaturesQuery =
"INSERT INTO `regression_reports` "
+ "(Feature, `Report`, `P`, `F`, `Remarks`)
VALUES
('"
+ feature + "','"+report +"',"+ pass +","+ fail+",/*"+ Remarks+"*/
+ ") " +
"ON DUPLICATE KEY UPDATE
`Report` = '"+ report + "',
`P` = " + pass + ",
`F`= " + fail+ ",
`Remarks` = " + remarks + "/*;*/";
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