Before starting to fetch rows from the cursor, you must open it. To open a cursor, you use the following syntax: OPENcursor_name;Code language:PostgreSQL SQL dialect and PL/pgSQL(pgsql) In this syntax,cursor_nameis the name of the cursor you declare in the declaration section. When you...
A cursor is a SELECT statement that is defined within the declaration section of your PLSQL code. We'll take a look at three different syntaxes for cursors. Cursor without parameters (simplest) The basic syntax for a cursor without parameters is: CURSOR cursor_name IS SELECT_statement; For ...
The syntax for theCURSOR FOR Loopis: FOR record_index incursor_name LOOP {.statements.} END LOOP; You would use aCURSOR FOR Loopwhen you want to fetch and process every record in a cursor. TheCURSOR FOR Loopwill terminate when all of the records in the cursor have been fetched. 译:当...
The following illustrates the syntax of the cursorFOR LOOPstatement: FORrecordINcursor_nameLOOPprocess_record_statements;ENDLOOP;Code language:PostgreSQL SQL dialect and PL/pgSQL(pgsql) 1) record Therecordis the name of the index that the cursorFOR LOOPstatement declares implicitly as a%ROWTYPEreco...
sharedcursor就是指缓存在librarycache(SGA下的Shared Pool)里的一种library cache object,说白了就是指缓存在library cache里的sql和匿名pl/sql。 它们是Oracle缓存在librarycache中的几十种librarycache object之一,它所属于的namespace是CRSR(也就是cursor的缩写)。
适用范围:SQL Server 请求定位更新。 此过程对游标的提取缓冲区内的一行或多行执行操作。 sp_cursor 通过在表格数据流(TDS)数据包中指定 ID = 1 来调用。 Transact-SQL 语法约定 语法 syntaxsql 复制 sp_cursor cursor , optype , rownum , table [ , value [ ...n ] ] [ ; ] 参数 重要 扩展...
定义了 Transact-SQL 服务器游标的属性,例如游标的滚动行为和用于生成游标所操作的结果集的查询。 DECLARE CURSOR 既接受基于 ISO 标准的语法,也接受使用一组 Transact-SQL 扩展的语法。 Transact-SQL 语法约定 语法 ISO 语法: syntaxsql 复制 DECLARE cursor_name [ INSENSITIVE ] [ SCROLL ] CURSOR FOR select...
The DB2® data server supports dynamic queries through the OPEN FOR statement in PL/SQL contexts.Syntax >>-OPEN--cursor-variable-name--FOR--dynamic-string---> >--+---+--->< | .-,---. | | V | | '-USING---bind-arg-+-' Description OPEN cursor-variable-name Specifies an ide...
Transact-SQL 语法约定 语法 ISO 语法: syntaxsql复制 DECLAREcursor_name[INSENSITIVE] [SCROLL]CURSORFORselect_statement[FOR{READ_ONLY|UPDATE[OFcolumn_name[ , ...n ] ] } ] [ ; ] Transact-SQL 扩展语法: syntaxsql复制 DECLAREcursor_nameCURSOR[LOCAL|GLOBAL] [FORWARD_ONLY|SCROLL] [STATIC|KEYSET|DY...
Transact-SQL 语法约定 语法 syntaxsql 复制 sp_cursor_list [ @cursor_return = ] cursor_return OUTPUT , [ @cursor_scope = ] cursor_scope [ ; ] 参数 [ @cursor_return = ] cursor_return OUTPUT 声明的游标变量的名称。 @cursor_return是 CURSOR 类型的 OUTPUT 参数。 游标是可滚动的动态只读游标...