ʹÓÃHibernate+MySql+native SQLµÄBUG,ÒÔ¼°½â¾ö°ì·¨
±¾À´ÊÇmssql+hibernate+native SQL Ó¦ÓõĺܺÍг
µ«Êǵ½Á˰Ñmssql»»³Émysql£¬¾Í³öÁË´í(ͬÑùµÄÊý¾Ý½á¹¹ºÍÊý¾Ý)¡£
²éѯ·½·¨ÊÇ£º
String sql =
"select id XXX_ID from t_tab";
List<Map> list = session.createSQLQuery(sql)
.setResultTransformer(Transformers.ALIAS_TO_ENTITY_MAP)
.list();
´íÎóÐÅÏ¢£º
org.hibernate.exception.SQLGrammarException: could not execute query
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:90)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
at org.hibernate.loader.Loader.doList(Loader.java:2231)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
at org.hibernate.loader.Loader.list(Loader.java:2120)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:312)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1722)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:165)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:175)
at com.exsun.common.dao.BasDaoImpl.findBySql(BasDaoImpl.java:173)
at com.exsun.arms.service.EmployeesalaryService.getList(EmployeesalaryService.java:32)
at com.exsun.arms.service.EmployeesalaryService$$FastClassByCGLIB$$2d81000f.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:700)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(Reflective
Ïà¹ØÎĵµ£º
¡¾ÎÊÌâÒ»
¡¿£ºÒѾܾø¶Ô OLE DB Ìṩ³ÌÐò 'MICROSOFT.JET.OLEDB.4.0' µÄÌØÊâ·ÃÎÊ¡£±ØÐëͨ¹ýÁ´½Ó·þÎñÆ÷À´·ÃÎÊ´ËÌṩ³ÌÐò¡£
¡¾·ÖÎö
¡¿£ºÕâÊÇÒòΪÄúµ±Ç°ÓÃÀ´·ÃÎÊÊý¾Ý¿âµÄµÇ¼µÄȨÏÞ²»¹»£¨È¨ÏÞÌ«µÍ£©¡£
¡¾½â¾ö
¡¿£ºÒªÃ´Äú»¹ÓÃsaµÇ¼£¬ÒªÃ´Ð޸ĵ±Ç°µÇ¼µÄȨÏÞ£¬²½ÖèÈçÏ£ºÆóÒµ¹ÜÀíÆ÷→°²È«ÐÔ→µÇ¼→ÕÒµ½ÄãËùÓõ ......
ÆäʵÄã¿ÉÒÔʹÓÃÊÂÎñ´¦Àí
±È·½ËµÔÚÒ»¸ö×Ö¶ÎÀïÃæÌí¼ÓÒ»¸öboolean µÄ×ֶε±ÄãÒª´¦Àí¸Ã×ֶεÄʱºò¾Í True ÄÄô±ðµÄÈ˶¼²»¿ÉÒÔ½øÐвÙ×÷
¡¡Èç¹ûÊÇFalse ÄÄô¾Í¿ÉÒÔ½øÐвÙ×÷¡«¡«ºÇ¿É¡«¡«ÎÒÊÇÕâÑùµÄ
¡¡¡¡²»¹ýÄã¿ÉÒÔ¿´¿´¡¡
¡¡SQLËø»úÖÆ
¡¡¡¡ÒÔÏÂÊÇÎÒÕÒµÄһЩÁÏ¡¡Èç¹ûÒªÀí½âSQLËø»úÖÆ ×îºÃ°ÑÏÂÀ´¿´ÍêŶ
ĬÈϵÄÊÂÎñ¸ôÀë¼ ......
MySQLÓÐËÄÖÖBLOBÀàÐÍ:
¡¡¡¡·tinyblob:½ö255¸ö×Ö·û
¡¡¡¡·blob:×î´óÏÞÖÆµ½65K×Ö½Ú
¡¡¡¡·mediumblob:ÏÞÖÆµ½16M×Ö½Ú
¡¡¡¡·longblob:¿É´ï4GB
¡¡¡¡ÔÚÿ¸öMySQLµÄÎĵµ(´ÓMySQL4.0¿ªÊ¼)µÄ½éÉÜÖÐ,Ò»¸ölongblobÁеÄ×î´óÔÊÐí³¤¶ÈÒÀÀµÓÚÔÚ¿Í»§/·þÎñÆ÷ÐÒéÖпÉÅäÖõÄ×î´ó°üµÄ´óСºÍ¿ÉÓÃÄÚ´æÊý¡£
¡¡¡ ......
À´Ô´:Ô¹ⲩ¿Í ºËÐÄÌáʾ£ºMySQLµÄ¹ÜÀíά»¤¹¤¾ß·Ç³£¶à£¬³ýÁËϵͳ×Ô´øµÄÃüÁîÐйÜÀí¹¤¾ßÖ®Í⣬»¹ÓÐÐí¶àÆäËûµÄͼÐλ¯¹ÜÀí¹¤¾ß£¬ÕâÀïÎÒ½éÉÜÎå¸öÎÒ¾³£Ê¹ÓõÄMySQLͼÐλ¯¹ÜÀí¹¤¾ß£¬¹©´ó¼Ò²Î¿¼¡£ MySQLÊÇÒ»¸ö·Ç³£Á÷ÐеÄСÐ͹ØÏµÐÍÊý¾Ý¿â¹ÜÀíϵͳ£¬2008Äê1ÔÂ16ºÅ±»Sun¹«Ë¾ÊÕ¹º¡£Ä¿Ç°MySQL±»¹ã·ºµØÓ¦ÓÃÔÚInternet ......
Oracle,MySQL,MSSQL ServerºÍAccessÊý¾Ý¿âµÄͳ¼Æº¯Êý
ÎÒÃÇÔÚ±à³ÌÖг£ÓõÄͳ¼Æº¯ÊýÓмÆÊý,ÇóºÍ,Çó×î´óÖµ,Çó×îСֵ,Ç󯽾ù,·½²îºÍ±ê×¼²î.
·½²î(Variance)
·½²îÊDZê׼ƫ²îµÄƽ·½¡£×éÖеÄÖµ£¬ÓëËüÃÇÆ½¾ùÖµÖ®¼äÆ«Àë³Ì¶ÈµÄ¶ÈÁ¿¡£
±ê׼ƫ²î(Standard Deviation)
Ò»¸ö²ÎÊý£¬Ö¸³öÒ»ÖÖ·½Ê½£¬Ò»¸ö¸ÅÂʺ¯ÊýÒÔÕâÖÖ·½Ê½·Ö²¼ÔÚÆ½¾ùÖµ¸ ......