Bind variables: 变量是在 host environment中定义,主要是提供参数给 PL/SQL BLOCK 系统绑定变量,可以通过 print 显示内容, 例如 PRINT g_n , VARIABLE return_code NUMBER ( 可以直接在PL/SQL中使用,不用再 declare , 此种变量必须要冒号 : 1:VARIABLEg_salary NUMBER 2:BEGIN 3:SELECTsalary 4:INTO:g_sal...
一、演示动态SQL的使用下面的示例中,首先使用动态SQL基于scott.emp创建表tb2,然后里直接使用动态SQL从新表中获取记录数并输出。再接下来是定义了一个动态PL/SQL代码并执行以获取当前的系统时间,最后使用动态SQL对新表进行更新。DECLARE --定义变量以及给变量设定初始值 sql_stmt VARCHAR2(100); plsql_block ...
Once an object type is defined and installed in the schema, you can use it to declare objects in any PL/SQL block, subprogram, or package. For example, you can use the object type to specify the datatype of an object attribute, table column, PL/SQL variable, bind variable, record fiel...
我有一个PL/SQL查询: DECLARE v_table_owner VARCHAR2(30) := 'TEST_USER'; v_table_name VARCHAR2(30) := 'TEST_TABLE'; v_view_name VARCHAR2(30) := 'PARTITION_TABLE_VIEW'; BEGIN -- Create a view to associate partitions with tables EXECUTE IMMEDIATE 'CREATE OR REPLACE VIEW ' || v_...
SQL() expression now accepts bind variables for other field values. For example: SQL(‘Department ‘ || :deptno) LIST(select) expression now accepts bind variables for other field values. For example: LIST(select empno from emp where deptno = :deptno) SQL() expression now accepts a select ...
Click the SQL Commands icon to display the SQL Commands page. On the SQL Commands page, enter the PL/SQL code in Example 4-1. Note that some of the lines of code are terminated with a semi colon (;) and the entire code unit is terminated with a slash (/). The slash is required...
w_sql := w_sql || ' and :B4 is null' ; END IF; OPEN w_cursor for w_sql using p_id_articolo, p_c_promozione, p_c_tema, p_c_prestazione; LOOP ... END LOOP; Posted in PL/SQL | Leave a Comment » Tags: bind variable, dynamic sql February 17, 2011...
PL/SQL详细介绍,设置oracle相关 1. 实现参照完整性 指若两个表之间具有主从关系(即主外键关系),当删除主表数据时,必须确保相关的从表数据已经被删除. 当修改主表的主键列数据时,必须确保相关从表数据已经被修改.为了实现级联删除,可在定义外部键约束时指定ON DELETE CASCADE关键字...
The “Linked Query” function can now open Master/Detail SQL Windows that remain synchronized: If you move to a new record in the master SQL Window, the detail SQL Window will automatically be refreshed after updating the master bind variable (:m_deptno). TheCustomlinked query allows you to...
替换变量可以放在SQL或PL/SQL语句中的任意位置,包含select值或字段,from表名,where字段或条件,order by、group by、having等任意位置,以及PL/SQL语句的deaclre、begin中的任意位置。 替换变量在使用时,进行的是字符串替换,没有数据类型之分,全部为字符串,在SQL语句执行之前已由sqlplus等工具完成了SQL语句的字符串替...