ireport + jasperreport报表使用 Parameters传递 where或 group by异常解决

异常信息如下：

Error filling print… Error executing SQL statement for : 动态whereSql
net.sf.jasperreports.engine.JRException: Error executing SQL statement for : 动态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

为什么会出现这种情况呢？这是因为 iReport不支持使用 Parameters传递 where或 group by子句，如何解决呢？很简单，使用$P!{ParameterName}即可，这种写法其实也就是把 SQL 语句的某个片段作为参数传入。

重新设计报表使用的 SQL 语句：

再次预览报表生成的.jasper 文件。
放入Web 项目的 WebRoot 文件夹中，重新运行 IE，正确显示出的结果。