达梦数据库字符串切割-自定义函数

--根据分隔符返回分隔的组数

CREATE OR REPLACE 
        FUNCTION get_StrArrayLength(STR VARCHAR(2000),SPLIT1 VARCHAR(10)) 
                RETURN INT 
        AS 
                V_LOCATION INT; 
                V_START    INT; 
                V_LENGTH   INT; 
        BEGIN 
                STR:=LTRIM(RTRIM(STR)); 
                V_LOCATION :=LOCATE(SPLIT1,STR); 
                V_LENGTH  :=1; 
                WHILE V_LOCATION <>0 
                LOOP 
                        V_START:=V_LOCATION+1; 
                        V_LOCATION   :=LOCATE(SPLIT1,STR,V_START); 
                        V_LENGTH  :=V_LENGTH+1; 
                END LOOP; 
                RETURN V_LENGTH; 
        END;

--取出根据某个字符切割后的第n个字符串

CREATE OR REPLACE 
        FUNCTION get_StrArrayStrOfIndex(STR VARCHAR(2000),SPLIT1 VARCHAR(10), 
                INDEX1   INT) 
                RETURN VARCHAR(2000) 
        AS 
                V_LOCATION INT; 
                V_START    INT; 
                V_NEXT     INT; 
                V_SEED     INT; 
        BEGIN 
                STR:=LTRIM(RTRIM(STR)); 
                V_START    :=1; 
                V_NEXT :=1; 
                V_SEED :=LEN(SPLIT1); 
                V_LOCATION :=LOCATE(SPLIT1,STR); 
                WHILE V_LOCATION  <>0 AND INDEX1 >V_NEXT 
                LOOP 
                        V_START:=V_LOCATION+V_SEED; 
                        V_LOCATION :=LOCATE(SPLIT1,STR,V_START); 
                        V_NEXT :=V_NEXT+1; 
                END LOOP; 
                IF V_LOCATION=0 THEN 
                        V_LOCATION :=LEN(STR)+1; 
                END IF; 
                RETURN SUBSTRING(STR,V_START,V_LOCATION-V_START); 
        END;

--调用方法

SELECT get_StrArrayLength('8a,9c,4c,5K',',') FROM SYSDBA.SYSDUAL ;

SELECT get_StrArrayStrOfIndex('8a,9c,4c,5K',',',3) FROM SYSDBA.SYSDUAL;