mapping文件：

     
          insert into WF_RISK_PROJECT_APPROVAL (RISKTGID, PROJID, CREATEDATE,       UPDATEDATE, STATUS, CONCLUSION,       CREATOR, RISKTYPE, APPLYTYPE,       ISCOMPENSATORY)    values (#{risktgid,jdbcType=NUMERIC}, #{projid,jdbcType=NUMERIC}, #{createdate,jdbcType=TIMESTAMP},       #{updatedate,jdbcType=TIMESTAMP}, #{status,jdbcType=INTEGER}, #{conclusion,jdbcType=VARCHAR},       #{creator,jdbcType=VARCHAR}, #{risktype,jdbcType=INTEGER}, #{applytype,jdbcType=INTEGER},       #{iscompensatory,jdbcType=INTEGER})      
      
               SELECT @@IDENTITY AS RISKTGID      
        
       
     
          insert into WF_RISK_PROJECT_APPROVAL    
            
       
                RISKTGID,      
             
       
                PROJID,      
             
       
                CREATEDATE,      
             
       
                UPDATEDATE,      
             
       
                STATUS,      
             
       
                CONCLUSION,      
             
       
                CREATOR,      
             
       
                RISKTYPE,      
             
       
                APPLYTYPE,      
             
       
                ISCOMPENSATORY,      
           
          
            
       
                #{risktgid,jdbcType=NUMERIC},      
             
       
                #{projid,jdbcType=NUMERIC},      
             
       
                #{createdate,jdbcType=TIMESTAMP},      
             
       
                #{updatedate,jdbcType=TIMESTAMP},      
             
       
                #{status,jdbcType=INTEGER},      
             
       
                #{conclusion,jdbcType=VARCHAR},      
             
       
                #{creator,jdbcType=VARCHAR},      
             
       
                #{risktype,jdbcType=INTEGER},      
             
       
                #{applytype,jdbcType=INTEGER},      
             
       
                #{iscompensatory,jdbcType=INTEGER},      
           
          
      
                 SELECT @@IDENTITY AS RISKTGID    
        
     

如上中的selectKey中的写法即可，然后就可以在action中使用了