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在java 中执行触发器代码、创表语句

 2008-06-23 20:43:35 来源:WEB开发网   
核心提示: 由于程序的需要,在SQLServer 中创建触发器及建表,在java 中执行触发器代码、创表语句,碰到了在java 代码中执行创建触发器及表, /**建立中间表*/ public static final String createMiddleTableSQL = "CREATE TABLE [d

   由于程序的需要,在SQLServer 中创建触发器及建表,碰到了在java 代码中执行创建触发器及表。

   /**建立中间表*/

   public static final String

     createMiddleTableSQL =

     "CREATE TABLE [dbo].[AlarmsMiddleTbl] ( "

     + " [id] [int] NOT NULL  , "

     + " [DeviceID] [smallint] NULL , "

     + " [Aid] [char] (10) COLLATE Chinese_PRC_BIN NULL , "

     + " [BeginTime] [datetime] NULL , "

     + " [EndTime] [datetime] NULL , "

     + " [Severity] [char] (2) COLLATE Chinese_PRC_BIN NULL , "

     + " [CondType] [char] (25) COLLATE Chinese_PRC_BIN NULL , "

     + " [DetailID] [smallint] NULL , "

     +

     " [AckNotes] [char] (150) COLLATE Chinese_PRC_BIN NULL , "

     +

     " [Description] [char] (255) COLLATE Chinese_PRC_BIN NULL , "

     +

     " [Systemtimes] [char] (30) COLLATE Chinese_PRC_BIN NULL "

     + ") ON [PRIMARY] ";

   /**在告警表上创建触发器*/

   public static final String createMiddleTblTriggerSQL =

     "CREATE  TRIGGER t_alarms "

     + "ON [NTBW].[dbo].[Alarms] "

     + "FOR INSERT, UPDATE "

     + "AS "

     + "DECLARE  @rows int "

     + "SELECT @rows =  @@rowcount "

     + "IF @rows = 0 "

     + "  return "

     +

     "IF EXISTS(SELECT 1 FROM inserted) AND NOT EXISTS(SELECT 1 FROM deleted) "

     + "BEGIN "

     + "  INSERT INTO [NTBW].[dbo].[AlarmsMiddleTbl] "

     + "  SELECT i.[id], i.[DeviceID], i.[Aid], i.[BeginTime], "

     +

     "  i.[EndTime], i.[Severity], i.[CondType], i.[DetailID], i.[AckNotes], "

     + "  i.[Description], getdate() from inserted i "

     + "END "

     +

     "IF EXISTS(SELECT 1 FROM inserted) AND EXISTS(SELECT 1 FROM deleted) AND "

     + " UPDATE(EndTime) "

     + "BEGIN "

     + "  INSERT INTO [NTBW].[dbo].[AlarmsMiddleTbl] "

     + "  SELECT i.[id], i.[DeviceID], i.[Aid], i.[BeginTime], "

     +

     "  i.[EndTime], i.[Severity], i.[CondType], i.[DetailID], i.[AckNotes], "

     + "  i.[Description], getdate() from inserted i "

     + "END "

     + "IF @@error <> 0 "

     + "BEGIN "

     + "  RAISERROR('ERROR',16,1) "

     + "  rollback transaction "

     + "  return "

     + "END ";

JAVA中执行以上语句过程:

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/** 
 
 * 创建中间表或者触发器 
 
 * 
 
 * @param sql String 
 
 * @return boolean 返回语句执行结果,true 成功,false 失败 
 
 */ 
 
private boolean createTableOrTrigger(String sql) 
 
{ 
 
   Connection con = null; 
 
   PreparedStatement st = null; 
 
   boolean result = false; 
 
   try 
 
   { 
 
     con = dbh.getConnection(); 
 
     st = con.prepareStatement(sql); 
 
     st.execute(); 
 
     result = true; 
 
     dbh.closeConnections(null, st, con); 
 
   } 
 
   catch (SQLException ex) 
 
   { 
 
     Log.error("Unable to create :" + 
 
          sql + " ,ErrorCode :" + ex.getErrorCode() + 
 
          ",Exception :" + 
 
          ex.getLocalizedMessage()); 
 
     dbh.closeConnections(null, st, con); 
 
   } 
 
 
 
   return result; 
 

Tags:java 执行 触发器

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