我有这样的用户表
user_id | user_name
--------+----------
1 | peter
2 | robert
3 | stive
像这样的出勤表
id | user_id | status | date
---+---------+--------+-----------
1 | 1 | p | 12-16-2014
2 | 2 | p | 12-16-2014
3 | 3 | a | 12-16-2014
4 | 1 | p | 12-17-2014
5 | 2 | a | 12-17-2014
6 | 3 | a | 12-17-2014
7 | 1 | p | 12-18-2014
8 | 2 | a | 12-18-2014
9 | 3 | p | 12-18-2014
但我希望显示如下结果
user_id | user_name | 12-16-2014 | 12-17-2014 | 12-18-2014
--------+-------------+------------+------------+-----------
1 | peter | p | p | p
2 | robert | p | a | a
3 | stive | a | a | p
选择应基于月份或周，具体取决于用户提供的日期。
我尝试在这样的java中执行查询，但它无法正常工作
String setsqlMax = "SET SESSION group_concat_max_len = 100000000000;";
String setsql ="SET @sql = NULL;";
String dynamicsql =
"SELECT"+
" GROUP_CONCAT(DISTINCT"+
" CONCAT("+
"'max(CASE WHEN attendance.attendance_date = ''',"+
" date_format(date, '%Y-%m-%d'),"+
" ''' THEN coalesce(p.present, '''') END) AS `',"+
" date_format(date, '%Y-%m-%d'), '`'"+
")"+
" ) INTO @sql"+
" FROM calendar"+
" where date>='01-01-2015'"+
" and date <= '31-01-2015';";
String mainsql = "SET @sql = CONCAT('SELECT p.user_id,',@sql,'"+
" from"+
"("+
"select c.user_id"+
" from calendar c"+
" cross join attendance a"+
" )"+
" attendance LEFT JOIN attendance p"+
" on attendance.user_id= p.user_id"+
" and attendance.date = p.attendance_date"+
" where attendance.date>=''01-01-2015''"+
" and attendance.date <= ''31-01-2015''"+
" group by attendance.user_id') ;";
String preparesql = " PREPARE stmt FROM @sql";
String ExcuteSql = "EXECUTE stmt ;";
String deallocateSql = "DEALLOCATE PREPARE stmt;";
String totalQuery = setsqlMax + setsql + dynamicsql + mainsql + preparesql+ ExcuteSql + deallocateSql;
这在MySQL查询浏览器中完全执行而不是java 错误是
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 'SET @sql = NULL;SELECT GROUP_CONCAT(DISTINCT CONCAT('max(CASE WHEN attendance.at' 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 com.nippon.dao.AttendanceDao.viewAttendanceMonthWise(AttendanceDao.java:408)
at com.nippon.service.AttendanceService.viewAttendanceMonthlyReport(AttendanceService.java:316)
at com.nippon.facade.AttendanceFacade.viewAttendanceMonthlyReport(AttendanceFacade.java:37)
at com.nippon.web.servants.AttendanceController.processRequest(AttendanceController.java:144)
at com.nippon.web.frontcontroller.FrontController.doGet(FrontController.java:150)
at com.nippon.web.frontcontroller.FrontController.doPost(FrontController.java:169)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)