oracle中sum字符串方法

CREATE OR REPLACE FUNCTION SumString(i_TableName IN VARCHAR2,

i_GroupColName IN VARCHAR2,

i_ResultColName IN VARCHAR2,

i_GroupColValue IN VARCHAR2,

i_Separator IN VARCHAR2)

RETURN VARCHAR2 IS

TYPE T_Cur IS REF CURSOR;

C_Cur T_Cur;

V_Sql VARCHAR2(2000);

V_Result VARCHAR2(2000);

V_Tmp VARCHAR2(200);

V_Cnt NUMBER := 0;

BEGIN

V_Result := ' ';

V_Sql := 'SELECT ' || i_ResultColName || ' FROM ' || i_TableName ||

' WHERE ' || i_GroupColName || ' = ' || i_GroupColValue;

OPEN C_Cur FOR V_Sql;

LOOP

FETCH C_Cur

INTO V_Tmp;

EXIT WHEN C_Cur%NOTFOUND;

IF V_Cnt = 0 THEN

V_Result := V_Tmp;

ELSE

V_Result := V_Result || i_Separator || V_Tmp;

END IF;

V_Cnt := V_Cnt + 1;

END LOOP;

CLOSE C_Cur;

RETURN V_Result;

END SUMSTRING;