1. 关于配置项的关系,以下类图展示了DECLARE变量与存储过程及 SQL 语句之间的关系: MySQL+DECLARE(variable_name: String, datatype: String)+SET(variable_name: String, value: any)+SELECT(variable_name: String)DECLARESETSELECT 调试步骤 调试DECLARE引用变量相关问题时,可以采取以下步骤,一步步确认问题的根源: ...
15:10:27 declare @val1 int set @val1=4 print @myvariable Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'declare @myvariable int set @myvariable=4 print @myvariable' at line ...
Declare syntax error in MySQL Workbench - The DECLARE syntax must between BEGIN and END. The syntax is as follows −BEGIN DECLARE yourVariableName1 dataType, DECLARE yourVariableName2 dataType, . . . . ENDHere is the query to avoid DECLARE syntax error
Cursor declarations must appear before handler declarations and after variable and condition declarations. A stored program may contain multiple cursor declarations, but each cursor declared in a given block must have a unique name. For an example, see Section 15.6.6, “Cursors”. ...
The following example uses a handler forSQLSTATE '23000', which occurs for a duplicate-key error: mysql>CREATETABLEtest.t(s1INT,PRIMARYKEY(s1));Query OK, 0 rows affected (0.00 sec)mysql>delimiter//mysql>CREATEPROCEDUREhandlerdemo()BEGINDECLARECONTINUEHANDLERFORSQLSTATE'23000'SET@x2=1;SET@x=...
mysql>CREATETABLEtest.t(s1INT,PRIMARYKEY(s1));Query OK, 0 rows affected (0.00 sec)mysql>delimiter//mysql>CREATEPROCEDUREhandlerdemo()BEGINDECLARECONTINUEHANDLERFORSQLSTATE'23000'SET@x2=1;SET@x=1;INSERTINTOtest.tVALUES(1);SET@x=2;INSERTINTOtest.tVALUES(1);SET@x=3;END;//Query OK, 0 ...