Firebird 存储过程 字段信息

CREATE PROCEDURE ProGetColumnInfo(TableName varchar(50))

returns (TableCode VARCHAR(50),FIELDNAME VARCHAR(20),ID INT,TYPENAME VARCHAR(20),LEN INT,SCALE int, SUBTYPE INT,IsPrimary INT)

AS

begin

    FOR

    SELECT  a.RDB$RELATION_NAME, b.RDB$FIELD_NAME ,

    b.RDB$FIELD_ID , d.RDB$TYPE_NAME ,

    c.RDB$FIELD_LENGTH/2 , c.RDB$FIELD_SCALE,c.RDB$FIELD_SUB_TYPE,

    CASE WHEN EXISTS(select 1 FROM RDB$INDEX_SEGMENTS T1 INNER JOIN  RDB$RELATION_CONSTRAINTS T2

    ON T1.RDB$INDEX_NAME =T2.RDB$INDEX_NAME

    WHERE T2.RDB$CONSTRAINT_TYPE = 'PRIMARY KEY'

    AND T2.RDB$RELATION_NAME = A.RDB$RELATION_NAME  AND T1.RDB$FIELD_NAME=b.RDB$FIELD_NAME)

    THEN 1 ELSE 0 END  AS IsPrimary

    FROM RDB$RELATIONS a  

    INNER JOIN RDB$RELATION_FIELDS b  ON a.RDB$RELATION_NAME = b.RDB$RELATION_NAME

    INNER JOIN RDB$FIELDS c    ON b.RDB$FIELD_SOURCE = c.RDB$FIELD_NAME

    INNER JOIN RDB$TYPES d    ON c.RDB$FIELD_TYPE = d.RDB$TYPE

    WHERE a.RDB$SYSTEM_FLAG = 0

    AND d.RDB$FIELD_NAME = 'RDB$FIELD_TYPE'  

    AND a.RDB$RELATION_NAME=:TableName

    ORDER BY a.RDB$RELATION_NAME, b.RDB$FIELD_ID

    INTO TableCode,FIELDNAME,ID,TYPENAME,LEN,SCALE, SUBTYPE,IsPrimary

    DO

    BEGIN

        suspend;

    END

END