DELIMITER // CREATE PROCEDURE MultipleVariablesProcedure() BEGIN -- 声明多个变量 DECLARE var1 INT DEFAULT 0; DECLARE var2 VARCHAR(50) DEFAULT 'Hello'; DECLARE var3 DECIMAL(10, 2) DEFAULT 100.00; -- 为变量赋值 SET var1 = 10; SET var2 = 'World'; SET var3 = 200.50; -- 输出变量的值...
This way is tedious and inconvenient. However, we have a more efficient way to declare multiple variables in one statement. We can use the DECLARE statement in the following form so that we can assign values to these variables in one SELECT statement: 这种方式既乏味又不便。 但是,我们有一种...
DELIMITER ;;CREATEPROCEDURE`optimize_table`()BEGINDECLAREtableSchemaVARCHAR(100);DECLAREtableNameVARCHAR(100);DECLAREstopFlagINTDEFAULT0;--大于30%碎片率的清理DECLARErsCURSORFORSELECTtable_schema,table_nameFROMinformation_schema.tablesWHERE((data_free/1024)/((data_length+index_length+data_free)/1024))>...
Name:'DECLARE VARIABLE'Description: Syntax: DECLARE var_name [, var_name] ... type [DEFAULT value] 声明本地变量。 default 子句,是提供默认值。如果不写,则值为null 例子:DECLARE PINT; set 分配值给变量。 mysql>help set Name:'SET'Description: Syntax: SET variable= expr [, variable =expr] ....
DROPTABLEIFEXISTSt1;CREATETABLEt1(c1TEXTNOTNULL);DROPPROCEDUREIFEXISTSp;delimiter//CREATEPROCEDUREp()BEGIN-- Declare variables to hold diagnostics area informationDECLAREerrcountINT;DECLAREerrnoINT;DECLAREmsgTEXT;DECLAREEXITHANDLERFORSQLEXCEPTIONBEGIN-- Here the current DA is nonempty because no prior state...
DECLARE i INT DEFAULT 0; myloop:LOOP -- 这里的myloop是我给循环起的一个标号或者是别名,这是语法要求,不起就会报错 SET i=i+1; IF i>=5 THEN LEAVE myloop; -- 根据我的循环标号中断循环 leave是中断循环的意思, 相当于Java中的break
Section 7.1.10, “Server Status Variables” Section 29.12.6.4, “The prepared_statements_instances Table”DECLARE Section 15.1.17, “CREATE PROCEDURE and CREATE FUNCTION Statements” Section 15.6.3, “DECLARE Statement” Section 15.6.7.3, “GET DIAGNOSTICS Statement” Section 15.6.7.5, “SIGNAL State...
@ sql/sql_string.h Declare append_ulonglong(). @ sql/sql_yacc.yy Support stored procedure variables in LIMIT.[13 Apr 2010 21:57] Bugs System A patch for this bug has been committed. After review, it may be pushed to the relevant source trees for release in the next version. You ...
2. Use CONDITON HANDLER. Recommended and suitable for multiple variables : BEGIN DECLARE COL_A, COL_B INT; ... -- say at this point COL_A is 1, COL_B is undefined yet BEGIN DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' BEGIN -- handle the ER_SP_FETCH_NO_DATA case gracefully : ...
DECLARE EXIT HANDLER FOR 1328 SELECT "HY000 (ER_SP_WRONG_NO_OF_FETCH_ARGS) Incorrect number of FETCH variables" as 'ERROR_NO SQLSTATE'; /*DECLARE CONTINUE HANDLER FOR 1329 SELECT "02000 (ER_SP_FETCH_NO_DATA) No data - zero rows fetched, selected, or processed" as 'ERROR_NO SQLSTATE...