ireport + jasperreport報表使用 Parameters傳遞 where或 group by異常解決

異常信息如下：

Error filling print… Error executing SQL statement for : 動態whereSql
net.sf.jasperreports.engine.JRException: Error executing SQL statement for : 動態whereSql at net.sf.jasperreports.engine.query.JRJdbcQueryExecuter.createDatasource(JRJdbcQueryExecuter.java:246) at net.sf.jasperreports.engine.fill.JRFillDataset.createQueryDatasource(JRFillDataset.java:1086) at net.sf.jasperreports.engine.fill.JRFillDataset.initDatasource(JRFillDataset.java:667) at net.sf.jasperreports.engine.fill.JRBaseFiller.setParameters(JRBaseFiller.java:1253) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:877) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:822) at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:61) at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:446) at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:276) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:745) at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:891) at org.openide.util.RequestProcessorTask.run(RequestProcessor.java:572)atorg.openide.util.RequestProcessor Processor.run(RequestProcessor.java:997) Caused by: com.mysql.jdbc.exceptions.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 ”where id=\’a\’;” at line 1 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2941) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715) at com.mysql.jdbc.Connection.execSQL(Connection.java:3249) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1403) at net.sf.jasperreports.engine.query.JRJdbcQueryExecuter.createDatasource(JRJdbcQueryExecuter.java:239) … 12 more

爲什麼會出現這種情況呢？這是因爲 iReport不支持使用 Parameters傳遞 where或 group by子句，如何解決呢？很簡單，使用$P!{ParameterName}即可，這種寫法其實也就是把 SQL 語句的某個片段作爲參數傳入。

重新設計報表使用的 SQL 語句：

再次預覽報表生成的.jasper 文件。
放入Web 項目的 WebRoot 文件夾中，重新運行 IE，正確顯示出的結果。