groovy学习7-groovy sql

发现groovy操作数据库很简单，一行import，2行操作代码。

 

 

代码

   
     

    
      
    
      import groovy.sql.Sql


    
      /*
    
      *
 * @author <a href="mailto:[email protected]">张挺</a>
 * @since 2010-4-2 15:07:35
 *
 
    
      */
    
      
piEstimate 
    
      =
    
       
    
      3
    
      ;
println(
    
      "
    
      Pi is about ${piEstimate}
    
      "
    
      );
println(
    
      "
    
      Pi is closer to ${22 / 7}
    
      "
    
      );


    
      //
    
      使用Sql对象查询
    
      
//
    
      第一个it是普通的对象应用，第二个it是groovy表达式
    
      

    
      sql 
    
      =
    
       Sql.newInstance(
    
      "
    
      jdbc:mysql://localhost:3306/test
    
      "
    
      , 
    
      "
    
      root
    
      "
    
      ,
 
    
      "
    
      xxxxxxx
    
      "
    
      , 
    
      "
    
      com.mysql.jdbc.Driver
    
      "
    
      )
sql.eachRow(
    
      "
    
      select * from user
    
      "
    
      , { println it.id 
    
      +
    
       
    
      "
    
       -- ${it.username} --
    
      "
    
      });


    
      //
    
      取第一行
    
      

    
      row 
    
      =
    
       sql.firstRow(
    
      "
    
      select username, password from user
    
      "
    
      )
println 
    
      "
    
      Row: columnA = ${row.username} and columnB = ${row.password}
    
      "
    
      


    
      //
    
      执行插入
    
      

    
      username 
    
      =
    
       
    
      "
    
      yue
    
      "
    
      
password 
    
      =
    
       
    
      "
    
      O'shea
    
      "
    
      
sql.execute(
    
      "
    
      insert into user (username, password) values (${username}, ${password})
    
      "
    
      )



    
      //
    
      another insert demo use prepareStatment
    
      

    
      username 
    
      =
    
       
    
      "
    
      yue
    
      "
    
      
password 
    
      =
    
       
    
      "
    
      wu
    
      "
    
      
sql.execute(
    
      "
    
      insert into user (username, password) values (?,?)
    
      "
    
      , [username, password])


    
      //
    
      更新操作，也可以用sql.execute("update user set password = ? where id=?", [comment,4])
    
      

    
      comment 
    
      =
    
       
    
      "
    
      test
    
      "
    
      
sql.executeUpdate(
    
      "
    
      update user set password = ? where id=?
    
      "
    
      , [comment,
    
      4
    
      ])


    
      //
    
      delete
    
      

    
      sql.execute(
    
      "
    
      delete from word where word_id = ?
    
      "
    
       , [
    
      5
    
      ])


    
      //
    
      在业务逻辑层就可以这么用直接返回list
    
      

    
      def getPersons() {
 def persons 
    
      =
    
       []
 sql.eachRow(
    
      "
    
      Select * from user
    
      "
    
      ) {
 persons 
    
      <<
    
       it.toRowResult()
 }
 
    
      return
    
       persons
}


    
      //
    
      如果返回的类的属性和表明一致的话就可以这么做
    
      

    
      Person p 
    
      =
    
       
    
      new
    
       Person( it.toRowResult() )