mybatis 动态sql

• where if

    
        select * from user
        
            
                and name like '%${name}%'
            
            
                and sex =#{sex}
            
        
    

• for each

    
        select * from user 
        
            
                
                    #{id}
                
            
        
    

• sql
  定义sql段

    
        and id=#{id}
    
    
        and username like '%${username}%'
    


    
        select * from user