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在java 中执行触发器代码、创表语句

来源:互联网  宽屏版  评论
2008-06-24 08:57:06

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:

view plaincopy to clipboardprint?

/**

* 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;

}

 
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: view plaincopy to clipboardprint? /** * 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; }
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