Question

我有两张桌子。我需要从第二个表中的列表中获取一些列值，而不是col2，并在循环中动态更新第一个表。

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();}
    }

错误：

java.sql.SQLException：无法使用executeQuery（）发出数据操作语句。在com.mysql.jdbc.SQLError.createSQLException（SQLError.java:1078）在com.mysql.jdbc.SQLError.createSQLException（SQLError.java:989）在com.mysql.jdbc.SQLError.createSQLException（SQLError.java:975）在com.mysql.jdbc.SQLError.createSQLException（SQLError.java:920）在com.mysql.jdbc.StatementImpl.checkForDml（StatementImpl.java:499）在com.mysql.jdbc.StatementImpl.executeQuery（StatementImpl.java:1518） at org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeQuery（DelegatingStatement.java:208） at org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeQuery（DelegatingStatement.java:208）在com.n7k.regression.RegressionDAO.updateRegReportsDB（RegressionDAO.java:71）在com.n7k.regression.RegressionServlet.doPost（RegressionServlet.java:63）

此错误仅在循环的第一次迭代中发生。任何建议调试其发生的原因。

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);

错误：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException：您的SQL语法中有错误;检查与MySQL服务器版本对应的手册，以便在第1行的''附近使用正确的语法 at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method） at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:39） at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:27） at java.lang.reflect.Constructor.newInstance（Constructor.java:513）在com.mysql.jdbc.Util.handleNewInstance（Util.java:411）在com.mysql.jdbc.Util.getInstance（Util.java:386）在com.mysql.jdbc.SQLError.createSQLException（SQLError.java:1054）在com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:4190）在com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:4122）在com.mysql.jdbc.MysqlIO.sendCommand（MysqlIO.java:2570）在com.mysql.jdbc.MysqlIO.sqlQueryDirect（MysqlIO.java:2731）在com.mysql.jdbc.ConnectionImpl.execSQL（ConnectionImpl.java:2812）在com.mysql.jdbc.StatementImpl.executeUpdate（StatementImpl.java:1811）在com.mysql.jdbc.StatementImpl.executeUpdate（StatementImpl.java:1725）在org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeUpdate（DelegatingStatement.java:228）在org.apache.tomcat.dbcp.dbcp.DelegatingStatement.executeUpdate（DelegatingStatement.java:228）在com.n7k.regression.RegressionDAO.updateRegReportsDB（RegressionDAO.java:73）

上述执行会出现此错误。手动执行相同的查询不会给我带来任何错误。

Answer 1

您的专栏Remarks完全遗失在这里，

// No `Remarks` even though you included it in the list. `F`, `Remarks`)
 "," + fail /* + Remarks! */ + ") " + "ON DUPLICATE KEY UPDATE `Report` = '"

您的专栏Remarks未在此处进行转义，

+ ", `Remarks` = '" + remarks + "';";

但应使用bind parameters或String StringEscapeUtils#escapeSql(String)，因为您的代码容易受sql injection攻击。

Answer 2

重新解决第二个问题 - 您要将四个值插入五列。你忘了＆＃34;备注＆＃34;

重新解决第一个问题 - 您还没有向我们展示正确的代码。

Answer 3

你在sql查询中犯了一些错误，比如;，你错过了得到的价值 Remarks。

  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 + "/*;*/";

JDBC，MySQL - 与PreparedStatement executeUpdate的DML错误

3 个答案: