四、DECLARE CURSOR WITH PARAMETER (%ISOPEN) DECLARE t_name books.books_name%TYPE; CURSOR cur(id varchar2) IS SELECT books_name FROM books WHERE books_id=id; BEGIN IF cur%ISOPEN THEN --%ISOPEN DBMS_OUTPUT.PUT_LINE('CURSOR HAS BEEN OPENED!'); ELSE OPEN CUR('0003'); END IF; FETCH c...
The result set of this cursor is all course_numbers whose subject_id matches the subject_id passed to the cursor via the parameter. Cursor with return clause The basic syntax for a cursor with a return clause is: CURSOR cursor_name RETURN field%ROWTYPE IS SELECT_statement; For example, you...
Ifyou have no library cache misses, then you might be able to accelerateexecution calls by setting the value of the initialization parameter CURSOR_SPACE_FOR_TIME to true. This parameter specifieswhether a cursor can be deallocatedfromthe library cache to make room for anew SQL statement. CURSOR...
2. 显式游标PL/SQL also lets you declare explicit cursors. An explicit cursor has a name and is associated with a query (SQLSELECT statement)—usually one that returns multiple rows. After declaring an explicit cursor, you must open it (with theOPEN statement),...
LRM-00112: multiplevalues not allowed for parameter 'query' EXP-00019: failed toprocess parameters, type 'EXP HELP=Y' for help EXP-00000: Exportterminated unsuccessfully 这通常是因为Query子句包含特殊字符导致的,由于特殊字符在命令行通常需要转义,所以导出的语法结构通常与众不同。在Windows上,通常可以使用...
问oracle open cursor with字符串变量出现错误EN我在使用字符串变量打开游标时遇到问题介绍oracle cursor(...
访问V$LIBRARYCACHE视图可以显示实际使用的语句(SQL和PL/SQL)访问内存的情况。如果init.ora的参数SHARED_POOL_SIZE设置得太小,内存中就没有足够的空间来存储所有的语句。固定命中率通常应该是95%或更高,而重载的次数不应该超过1%。查询V$SQL_BIND_CAPTURE视图,看看每个SQL绑定是否太高,是否需要CURSOR_SHARING。
( _ "EMPCURSOR", OracleType.Cursor)).Direction = _ ParameterDirection.Output cmd.Parameters.Add(New OracleParameter(_ "DEPTCURSOR", OracleType.Cursor)).Direction = _ ParameterDirection.Output rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection) While (rdr.Read()) REM do something with the ...
ORA-17012 Parameter Type Conflict 参数类型冲突。 ORA-17014 ResultSet.next was not called 未调用 ResultSet.next。 ORA-17015 Statement was cancelled 语句被取消。 ORA-17016 Statement timed out 语句超时。 ORA-17017 Cursor already initialized 已初始化游标。 ORA-17018 Invalid cursor 无效的游标。 ORA-...
固定命中率通常应该是95%或更高,而重载的次数不应该超过1%。查询V$SQL_BIND_CAPTURE视图,看看每个SQL绑定是否太高,是否需要CURSOR_SHARING。SQL> select sum(pinhits)/sum(pins)*100 from v$librarycache; SUM(PINHITS)/SUM(PINS)*100 --- 98.2787413813059SQL> select sum(pinhits-reloads)/...