SQLSERVER

//性能
SET STATISTICS IO on;  
SET STATISTICS TIME on;

//Mysql 切分字符串

CREATE  PROCEDURE proc_split(
    inputstring VARCHAR(1000),
    delim CHAR(1)
)
BEGIN
    DECLARE strlen INT;
    DECLARE last_index INT;
    DECLARE cur_index INT;
    DECLARE cur_char VARCHAR(200);
    DECLARE len INT;
    SET cur_index=1;
    SET last_index=0;
    SET strlen=LENGTH(inputstring);  
    DROP TABLE IF EXISTS splittable;
    CREATE TEMPORARY TABLE splittable(
        id INT AUTO_INCREMENT,
        VALUE VARCHAR(20),
        PRIMARY KEY (`ID`),
        UNIQUE KEY `ID` (`ID`)
    ) ;
    WHILE(cur_index<=strlen) DO    
    BEGIN
        IF SUBSTRING(inputstring FROM cur_index FOR 1)=delim OR cur_index=strlen THEN
            SET len=cur_index-last_index-1;
            IF cur_index=strlen THEN
               SET len=len+1;
            END IF;
            INSERT INTO splittable(`value`)VALUES(SUBSTRING(inputstring FROM (last_index+1) FOR len));
            SET last_index=cur_index;
        END IF;
        SET cur_index=cur_index+1;
    END;
    END WHILE;
END;

CALL proc_split('1,2,3,4,3,4,3,4,4',',') ;
SELECT * from  splittable;

//SQL SERVER 切分

CREATE FUNCTION fnSplitStr (
    @sText      NVARCHAR(Max),
    @sDelim     CHAR(1)
)

RETURNS @retArray TABLE (
    value   VARCHAR(100)
)
AS
BEGIN
    DECLARE 
        @posStart        BIGINT,
        @posNext        BIGINT,
        @valLen            BIGINT,
        @sValue            NVARCHAR(100);

    IF @sDelim IS NULL 
    BEGIN
        IF LEN(@sText)>100 SET @sText = SUBSTRING(@sText, 1, 100)
        
        INSERT @retArray (value)
        VALUES (@sText);
    END
    ELSE
    BEGIN
        SET @posStart = 1;

        WHILE @posStart <= LEN(@sText)
        BEGIN
            SET @posNext = CHARINDEX(@sDelim, @sText, @posStart);

            IF @posNext <= 0 
                SET @valLen = LEN(@sText) - @posStart + 1;
            ELSE
                SET @valLen = @posNext - @posStart;

            SET @sValue = SUBSTRING(@sText, @posStart, @valLen);
            SET @posStart = @posStart + @valLen + 1;

            IF LEN(@sValue) > 0
            BEGIN
                IF LEN(@sValue)>100 SET @sValue = SUBSTRING(@sValue, 1, 100)
                
                INSERT @retArray (value)
                VALUES (@sValue);
            END
        END
    END
    RETURN
END


SELECT *  FROM  fnSplitStr('1,2,3,2,,3,3',',')

一只站在树上的鸟儿，从来不会害怕树枝会断裂，因为它相信的不是树枝，而是它自己的翅膀。与其每天担心未来，不如努力做好现在。