1 2 3 4 5 10Code language: SQL (Structured Query Language) (sql) In this example, we had a variable named l_counter, which is also the name of the index. The result shows that l_counter in the FOR loop hides the variable l_counter declared in the enclosing block. To reference the...
PLSQL 的 for循环的小例子 开始 DECLAREv_lowerNUMBER:=1; v_upperNUMBER:=10;BEGINFORiINv_lower .. v_upper LOOP dbms_output.put_line('i is:'||i);ENDLOOP;END; 要注意,i 并没有进行事前定义。运行的结果是: anonymous block completed iis:1iis:2iis:3iis:4iis:5iis:6iis:7iis:8iis:9iis...
Oracle PL/SQL程序都是以块(block)为基本单位,整个Oracle PL/SQL块分三部分:声明部分(用declare开头)、执行部分(以 begin开头)和异常处理部分(以exception开头)。其中执行部分是必须的,其他两个部分可选。无论Oracle PL/SQL程序段的代码量有多大,其基本结构就是由这三部分组成。 2.控制结构 Oracle PL/SQL程序段...
问从未输入FORALL时的FORALL和sql%rowcountEN对PL/SQL而言，任何的PL/SQL块或者子程序都是PL/SQL引擎...
This statement can be invoked within a PL/SQL procedure, function, trigger, or anonymous block. Authorization No specific authorization is required to reference a row expression within an SQL statement; however, for successful statement execution, all other authorization requirements for processing a cu...
一、单行函数 函数分为系统内置函数自定义函数(后期学习的plsql 中定义);了解系统内置函数(方法),重点掌握 to_date 、 to_char (字符和日期的转换)...根据函数的返回结果,我们将函数分为单行函数和多行函数 1)、单行函数:一条记录返回一个结果 2)、多行函数 组函数 聚合函数 (重点) :多条记录 返回一个结...
{ plsql_block | call 支持,有差异。 gaussdb不支持 ::= routine_clause } plsql_block,仅支 持execute procedure function_name ( arguments );方 式执行function, 并且function需要 用户定义,必须声 明为不带参数并返 回类型为触发器, 在触发器触发时执 行。 instead_of_d instead of 支持,有差异。
PlSqlStatement A represtation of a PL/SQL statement, or compound construct that can be used where a simple statement could (eg a block, if, loop etc). class PlSqlSubProgram A representation of a PL/SQL procedure or function. class PlSqlVariable A representation of a PL/SQL...
Host arrays are declared in a host environment such as an OCI or a Pro*C program and must be prefixed with a colon to distinguish them from PL/SQL collections. In the example below, an input host array is used in aDELETEstatement. At run time, the anonymous PL/SQL block is sent to...
For example, use this function as a check to exit the PLSQL block between batches when in a long running PL/SQL loop. This feature is available starting Oracle Database 19c, release update 10. SQL> select SYS_CONTEXT('USERENV', 'DRAIN_STATUS') from dual ; SYS_CONTEXT('USERENV','...