$PBExportHeader$f_sys_scidentity.srf
global type f_sys_scidentity from function_object
end type

forward prototypes
global function long f_sys_scidentity (long arg_sc_id, string arg_tablename, string arg_columnname, ref string arg_msg, boolean arg_ifcommit, transaction arg_transaction)
end prototypes

global function long f_sys_scidentity (long arg_sc_id, string arg_tablename, string arg_columnname, ref string arg_msg, boolean arg_ifcommit, transaction arg_transaction);//f_sys_scidentity
//long arg_sc_id       :目标学校id,>=0;(如果是为取得学校id本身,可以赋0)
//string arg_tablename :目标表名称
//string arg_columnname:目标表字段名称
//return 0  //操作失败
//return >0 //操作成功返回新ID


Long new_selfid = 0,ls_idtop
Long rslt_id = 1
String str_dwSQl,str_SyntaxFromSQL
datastore ds_maxid
Long ins_maxid
Long add_n = 1
String ls_msg = ""



IF arg_sc_id < 0 THEN
	arg_msg = '错误唯一编码'
	rslt_id = 0
	GOTO ext
END IF

arg_tablename = Lower(arg_tablename)
arg_columnname = Lower(arg_columnname)


//-------------------------------------------------------1.ID加1
UPDATE Sys_scIdentity
	SET ScIdentityno = ScIdentityno + 1
	WHERE Sys_scIdentity.Scid = :arg_sc_id AND
	lower(Sys_scIdentity.tablename) = :arg_tablename AND
	lower(Sys_scIdentity.columnname) = :arg_columnname
	Using arg_transaction;
IF arg_transaction.SQLCode <> 0 THEN
	arg_msg = '更新相关唯一码记录操作失败'+arg_transaction.SQLErrText
	rslt_id = 0
	GOTO ext
END IF

//-------------------------------------------------------2.如果无则加入新ID
IF arg_transaction.SQLNRows = 0 THEN
	new_selfid = 0
	INSERT INTO Sys_scIdentity (id,Scid,ScIdentityno,tablename,columnname)
		VALUES (:new_selfid,:arg_sc_id,11,:arg_tablename,:arg_columnname)
		Using arg_transaction;
	//预留1~10的id作系统约定的预设数据id
	IF arg_transaction.SQLCode <> 0 THEN
		arg_msg = '新建相关唯一码记录操作失败'+arg_transaction.SQLErrText
		rslt_id = 0
		GOTO ext
	END IF
END IF

//-------------------------------------------------------3.查询最新ID
SELECT top 1 Sys_scIdentity.ScIdentityno
	INTO :rslt_id
	FROM Sys_scIdentity
	WHERE Sys_scIdentity.Scid = :arg_sc_id AND
	lower(Sys_scIdentity.tablename) = :arg_tablename AND
	lower(Sys_scIdentity.columnname) = :arg_columnname
	Using arg_transaction;
	
IF arg_transaction.SQLCode <> 0 THEN //---------查询ID失败
	arg_msg = '查询相关唯一码记录操作失败'+arg_transaction.SQLErrText
	rslt_id = 0
	GOTO ext
END IF


IF sys_option_if_sql2008 = 0 THEN
	//-------------------------------------------------------4.建立查找最大ID_dw
	ds_maxid = Create datastore
	str_dwSQl = 'select max('+arg_columnname+') as maxid from '+arg_tablename
	str_SyntaxFromSQL = sqlca.SyntaxFromSQL(str_dwSQl,"style(type=grid)",ls_msg) //本地检查
	IF ls_msg > '' THEN
		arg_msg = "dw语法生成失败"
		rslt_id = 0
		GOTO ext
	END IF
	
	ds_maxid.Create(str_SyntaxFromSQL,ls_msg)
	IF ls_msg > '' THEN
		arg_msg = "建立相关DW失败"
		rslt_id = 0
		GOTO ext
	END IF
	ds_maxid.SetTransObject(arg_transaction)
	ds_maxid.Retrieve()
	ins_maxid = ds_maxid.GetItemNumber(1,1)
	IF IsNull(ins_maxid) THEN
		ins_maxid = 10
	END IF
	Destroy ds_maxid
	
	//--------------------------------------------------------5.比较ID
	IF ins_maxid < rslt_id THEN
		GOTO ext
	ELSE
		add_n = ins_maxid - rslt_id + 1
		
		UPDATE Sys_scIdentity
			SET ScIdentityno = ScIdentityno + :add_n
			WHERE Sys_scIdentity.Scid = :arg_sc_id AND
			lower(Sys_scIdentity.tablename) = :arg_tablename AND
			lower(Sys_scIdentity.columnname) = :arg_columnname
			Using arg_transaction;
		IF arg_transaction.SQLCode <> 0 THEN
			arg_msg = '更新相关唯一码记录操作失败'+arg_transaction.SQLErrText
			rslt_id = 0
			GOTO ext
		END IF
		
		rslt_id = rslt_id + add_n
		GOTO ext
	END IF
END IF

//-----------------------------------------------------------
ext:
IF IsNull(rslt_id) THEN rslt_id = 0
IF arg_ifcommit And  rslt_id > 0 THEN
	COMMIT Using arg_transaction;
END IF
IF rslt_id = 0 THEN
	ROLLBACK Using arg_transaction;
END IF

RETURN rslt_id




end function