When bind variables appear in a SQL statement, the database assumes that cursor sharing is intended and that different invocations use the same execution plan. If different invocations of the cursor significantly benefit from different execution plans, then bind-aware cursor matching is required. Bin...
两个SQL语句中必须使用相同的名字的绑定变量(bind variables) 比如: 第一组的两个SQL语句是相同的(可以共享),而第二组中的两个语句是不同的(即使在运行时,赋于不同的绑定变量相同的值) a. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select pin,name from people where pin=:blk1.pin;select pin...
DBMS_Sql.parse(cursor_id,'insert into t values(:username,:user_id,Sysdate)',DBMS_SQL.V7); DBMS_Sql.bind_variable(cursor_id,'username','test'||to_char(i)); DBMS_Sql.bind_variable(cursor_id,'user_id',i); xRow:=DBMS_Sql.execute(cursor_id); --insert into t values('test'||to_c...
两个SQL语句中必须使用相同的名字的绑定变量(bind variables) 比如: 第一组的两个SQL语句是相同的(可以共享),而第二组中的两个语句是不同的(即使在运行时,赋于不同的绑定变量相同的值) a. selectpin,namefrompeoplewherepin=:blk1.pin; selectpin,namefrompeoplewherepin=:blk1.pin; 1. 2. b. selectpin...
C. 两个SQL语句中必须使用相同的名字的绑定变量(bind variables) 例如: 第一组的两个SQL语句是相同的(可以共享),而第二组中的两个语句是不同的(即使在运行时,赋于不同的绑定变量相同的值) a. select pin , name from people where pin = :blk1.pin; ...
plant_detail b where a.city_id = b.city_id 不能 用户jack 通过private synonym访问plant_detail 而jill 是表的所有者,对象不同. C. 两个SQL语句中必须使用相同的名字的绑定变量(bind variables) 例如:第一组的两个SQL语句是相同的(可以共享),而第二组中的两个语句是不同的(即使在运行时,赋于不同的绑...
Whena query uses literals, the optimizer can use theliteral values to find the best plan. However, when a query uses bindvariables, the optimizer must select the best plan without the presence ofliterals in the SQL text. This task can be extremely difficult. By peeking at bind values the ...
Deletes one or more substitution variables that you defined either explicitly (with the DEFINE command) or implicitly (with a START command argument). Use the following commands to create and display bind variables: PRINT [variable...]
Deletes one or more substitution variables that you defined either explicitly (with the DEFINE command) or implicitly (with a START command argument). Use the following commands to create and display bind variables: PRINT [variable ...] Displays the current values of bind variables, or lists al...
Generates editable PL/SQL block for populating parameters Full functioning debugger Control program execution(Step into, over, ...) Inspect and modify variables Configure breakpoint conditions 11. Run and Create Reports Suite of Reports Data Dictionary ...