java – org.springframework.jdbc.BadSqlGrammarException：StatementCallback;糟糕的SQL语法
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HTTP Status 500 - Request processing failed; nested exception is org.springframework.jdbc.BadSqlGrammarException: StatementCallback; bad SQL grammar [select * from assignment where username=reza]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'reza' in 'where clause'
这是我的dao文件
@Override
public List < Assignment > showAllAssignment(String username) {
String sql = "select * from assignment where username=" + username;
return jdbcTemplate.query(sql, new AssignmentMapper());
}
这是我的控制器
@RequestMapping(value = "/showAllAssignment/{reqUserName}/show", method = RequestMethod.GET)
public ModelAndView showAllAssignment(@PathVariable("reqUserName") String reqUserName) {
List < Assignment > list = new ArrayList < Assignment > ();
list = assignmentService.showAllAssignment(reqUserName);
ModelAndView mav = new ModelAndView("show_All_Assignments");
mav.addObject("assignment", list);
return mav;
}
这是错误：
2018-05-03 01:55:08,232 [org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver]-[DEBUG] Resolving exception from handler [public org.springframework.web.servlet.ModelAndView org.assignment.controller.AssignmentController.showAllAssignment(java.lang.String)]: org.springframework.jdbc.BadSqlGrammarException: StatementCallback; bad SQL grammar [select * from assignment where username=reza]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'reza' in 'where clause'
2018-05-03 01:55:08,234 [org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver]-[DEBUG] Resolving exception from handler [public org.springframework.web.servlet.ModelAndView org.assignment.controller.AssignmentController.showAllAssignment(java.lang.String)]: org.springframework.jdbc.BadSqlGrammarException: StatementCallback; bad SQL grammar [select * from assignment where username=reza]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'reza' in 'where clause'
2018-05-03 01:55:08,234 [org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver]-[DEBUG] Resolving exception from handler [public org.springframework.web.servlet.ModelAndView org.assignment.controller.AssignmentController.showAllAssignment(java.lang.String)]: org.springframework.jdbc.BadSqlGrammarException: StatementCallback; bad SQL grammar [select * from assignment where username=reza]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'reza' in 'where clause'
2018-05-03 01:55:08,235 [org.springframework.web.servlet.DispatcherServlet]-[DEBUG] Could not complete request
org.springframework.jdbc.BadSqlGrammarException: StatementCallback; bad SQL grammar [select * from assignment where username=reza]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'reza' in 'where clause'
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:235)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
at org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1402)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:388)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:446)
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:456)
at org.assignment.dao.AssignmentDaoImpl.showAllAssignment(AssignmentDaoImpl.java:67)
at org.assignment.service.AssignmentServiceImpl.showAllAssignment(AssignmentServiceImpl.java:39)
at org.assignment.controller.AssignmentController.showAllAssignment(AssignmentController.java:193)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:870)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:776)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1539)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1495)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'reza' in 'where clause'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
at com.mysql.jdbc.Util.getInstance(Util.java:372)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:980)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3835)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3771)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2531)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2489)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1446)
at org.springframework.jdbc.core.JdbcTemplate$1QueryStatementCallback.doInStatement(JdbcTemplate.java:433)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:376)
... 42 more
任何人都可以帮我解决这个问题？
问题是我想在我的表分配中选择数据,其中用户名是define.
例如String username1 =’reza’;但是当我尝试使用上面的语法显示所有数据时选择* …. where username =“username1;
结果,系统将’reza’作为列而不是列上的值读取.
解决方法:
您提供的SQL查询不是正确的SQL,因为错误建议：
try String sql =“select * from assignment where username =’”username“’;”;
而不是String sql =“select * from assignment where username =”username;
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