2)case語句

mysql?>?DELIMITER?//

mysql?>CREATEPROCEDUREproc3?(inparameterint)

->begin

->declarevarint;

->setvar=parameter+1;

->casevar

->when0then

->insertintotvalues(17);

->when1then

->insertintotvalues(18);

->else

->insertintotvalues(19);

->endcase;

->end;

->?//

mysql?>?DELIMITER?;

4.6.2循環語句

1)while ···· end whilemysql?>?DELIMITER?//

mysql?>CREATEPROCEDUREproc4()

->begin

->declarevarint;

->setvar=0;

->?while?var<6?do

->insertintotvalues(var);

->setvar=var+1;

->endwhile;

->end;

->?//

mysql?>?DELIMITER?;

2)repeat···· end repeat：它在執行操作后檢查結果，而while則是執行前進行檢查。mysql?>?DELIMITER?//

mysql?>CREATEPROCEDUREproc5?()

->begin

->declarevint;

->setv=0;

->?repeat

->insertintotvalues(v);

->setv=v+1;

->?until?v>=5

->endrepeat;

->end;

->?//

mysql?>?DELIMITER?;

3)loop ·····end loop：loop循環不需要初始條件，這點和while循環相似，同時和repeat循環一樣不需要結束條件, leave語句的意義是離開循環。

[begin_label:]LOOP

statement_list

END LOOP [end_label]

mysql?>?DELIMITER?//

mysql?>CREATEPROCEDUREproc6?()

->begin

->declarevint;

->setv=0;

->?LOOP_LABLE:loop

->insertintotvalues(v);

->setv=v+1;

->?if?v?>=5then

->?leave?LOOP_LABLE;

->endif;

->endloop;

->end;

->?//

mysql?>?DELIMITER?;

4.6.3LEAVE語句：跳出循環控制

LEAVE label

注：label標號可以用在begin repeat while 或者loop 語句前，語句標號只能在合法的語句前面使用。可以跳出循環，使運行指令達到復合語句的最后一步。

4.6.4ITERATE迭代：通過引用復合語句的標號,跳出本次循環，執行下一輪。mysql?>?DELIMITER?//

mysql?>CREATEPROCEDUREproc10?()

->begin

->declarevint;

->setv=0;

->?LOOP_LABLE:loop

->?if?v=3then

->setv=v+1;

->?ITERATELOOP_LABLE;

->endif;

->insertintotvalues(v);

->setv=v+1;

->?if?v>=5then

->?leave?LOOP_LABLE;

->endif;

->endloop;

->end;

->?//

mysql?>?DELIMITER?;

4.7MySQL存儲過程的基本函數

(1).字符串類

CHARSET(str) //返回字串字符集CONCAT (string2 [,... ]) //連接字串INSTR (string ,substring ) //返回substring首次在string中出現的位置,不存在返回0

LCASE (string2 ) //LCASE (string2 ) //轉換成小寫LEFT (string2 ,length ) //從string2中的左邊起取length個字符LENGTH (string ) //string長度LOAD_FILE (file_name ) //從文件讀取內容LOCATE (substring , string [,start_position ] )同INSTR,但可指定開始位置LPAD (string2 ,length ,pad ) //重復用pad加在string開頭,直到字串長度為length

LTRIM (string2 ) //LTRIM (string2 ) //去除前端空格REPEAT (string2 ,count ) //重復count次REPLACE (str ,search_str ,replace_str ) //在str中用replace_str替換search_str

RPAD (string2 ,length ,pad) //RPAD (string2 ,length ,pad) //在str后用pad補充,直到長度為length

RTRIM (string2 ) //RTRIM (string2 ) //去除后端空格STRCMP (string1 ,string2 ) //逐字符比較兩字串大小,SUBSTRING (str , position [,length ]) //從str的position開始,取length個字符,注：mysql中處理字符串時，默認第一個字符下標為1，即參數position必須大于等于1例：

mysql>selectsubstring('abcd',0,2);

+-----------------------+

|substring('abcd',0,2)?|

+-----------------------+

|?|

+-----------------------+

1?rowinset(0.00?sec)

mysql>selectsubstring('abcd',1,2);

+-----------------------+

|substring('abcd',1,2)?|

+-----------------------+

|?ab?|

+-----------------------+

1?rowinset(0.02?sec)

TRIM([[BOTH|LEADING|TRAILING] [padding] FROM]string2) //去除指定位置的指定字符UCASE (string2 ) //轉換成大寫RIGHT(string2,length) //取string2最后length個字符SPACE(count) //生成count個空格

(2).數學類

ABS (number2 ) //絕對值BIN (decimal_number ) //十進制轉二進制CEILING (number2 ) //向上取整CONV(number2,from_base,to_base) //進制轉換FLOOR (number2 ) //向下取整FORMAT (number,decimal_places ) //保留小數位數HEX (DecimalNumber ) //轉十六進制注：HEX()中可傳入字符串，則返回其ASC-11碼，如HEX('DEF')返回4142143也可以傳入十進制整數，返回其十六進制編碼，如HEX(25)返回19

LEAST (number , number2 [,..]) //LEAST (number , number2 [,..]) //求最小值MOD (numerator ,denominator ) //求余POWER (number ,power ) //求指數RAND([seed]) //隨機數

ROUND (number [,decimals ]) //四舍五入,decimals為小數位數]

注：返回類型并非均為整數，如：

(1)默認變為整形值mysql>selectround(1.23);

+-------------+

|?round(1.23)?|

+-------------+

|?1?|

+-------------+

1?rowinset(0.00?sec)

mysql>selectround(1.56);

+-------------+

|?round(1.56)?|

+-------------+

|?2?|

+-------------+

1?rowinset(0.00?sec)

(2)可以設定小數位數，返回浮點型數據mysql>selectround(1.567,2);

+----------------+

|?round(1.567,2)?|

+----------------+

|?1.57?|

+----------------+

1?rowinset(0.00?sec)

(3).日期時間類ADDTIME (date2 ,time_interval ) //將time_interval加到date2

CONVERT_TZ (datetime2 ,fromTZ ,toTZ ) //轉換時區CURRENT_DATE ( ) //當前日期CURRENT_TIME ( ) //當前時間CURRENT_TIMESTAMP ( ) //當前時間戳DATE (datetime ) //返回datetime的日期部分DATE_ADD (date2 , INTERVAL d_value d_type ) //在date2中加上日期或時間DATE_FORMAT (datetime ,FormatCodes ) //使用formatcodes格式顯示datetime

DATE_SUB (date2 , INTERVAL d_value d_type ) //在date2上減去一個時間DATEDIFF (date1 ,date2 ) //兩個日期差DAY (date ) //返回日期的天DAYNAME (date ) //英文星期DAYOFWEEK (date ) //星期(1-7) ,1為星期天DAYOFYEAR (date ) //一年中的第幾天EXTRACT (interval_name FROM date ) //從date中提取日期的指定部分MAKEDATE (year ,day ) //給出年及年中的第幾天,生成日期串MAKETIME (hour ,minute ,second ) //生成時間串MONTHNAME (date ) //英文月份名NOW ( ) //當前時間SEC_TO_TIME (seconds ) //秒數轉成時間STR_TO_DATE (string ,format ) //字串轉成時間,以format格式顯示TIMEDIFF (datetime1 ,datetime2 ) //兩個時間差TIME_TO_SEC (time ) //時間轉秒數]

WEEK (date_time [,start_of_week ]) //第幾周YEAR (datetime ) //年份DAYOFMONTH(datetime) //月的第幾天HOUR(datetime) //小時LAST_DAY(date) //date的月的最后日期MICROSECOND(datetime) //微秒MONTH(datetime) //月MINUTE(datetime) //分返回符號,正負或0

SQRT(number2) //開平方

總結

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