在PostgreSQL 中,除了标准 SQL 语句之外还支持使用各种过程语言(例如 PL/pgSQL、C、PL/Tcl、PL/Python、PL/Perl、PL/Java 等 )创建复杂的过程和函数,称为存储过程(Stored Procedure)和自定义函数(User-Defined Function)。存储过程支持许多过程元素,例如控制结构、循环和复杂的计算。 使用存储过程带来的好处包括: ...
7.带参数的cursor CURSOR C_USER(C_ID NUMBER) IS SELECT NAME FROM USER WHERE TYPEID=C_ID; OPEN C_USER(变量值); LOOP FETCH C_USER INTO V_NAME; EXIT FETCH C_USER%NOTFOUND; do something END LOOP; CLOSE C_USER; 1. 2. 3. 4. 5. 6. 7. 8. 8.用pl/sql developer debug 连接数据...
create or replace procedure allEmps is --声明游标 cursor c1 is select * from emps; begin for v_row in c1 loop dbms_output.put_line(v_row.ename||'--->'||v_row.job||'--->'||v_row.sal); end loop; end; --调用 begin allemps(); end; 1. 2. 3. 4. 5. 6. 7. 8. 9....
This topic provides reference information about cursor compatibility between Microsoft SQL Server 2019 and Amazon Aurora PostgreSQL. It introduces the concept of cursors and their role in database operations, explaining how they allow developers to work with result sets s...
max_cursor_result_set_size mv_enable_aqmv_for_session navigate_super_null_on_error parse_super_null_on_error pg_federation_repeatable_read query_group search_path spectrum_enable_pseudo_columns enable_spectrum_oid spectrum_query_maxerror statement_timeout stored_proc_log_min_messages timezone use...
nested loop join: The right relation is scanned once for every row found in the left relation. This strategy is easy to implement but can be very time consuming. (However, if the right relation can be scanned with an index scan, this can be a good strategy. It is possible to use valu...
One alternative is to use a temporary table and a cursor. Binds Unlike other relational databases like Oracle, PostgreSQL does not support bind variables. Instead, PostgreSQL uses the PREPARE statement to achieve similar results. SQL Server supports bind variables. Each parameter marker in ...
CREATE OR REPLACE FUNCTION public.foo() RETURNS refcursor AS $$ declare c cursor for select 1; r refcursor; begin open c; r := 'c'; return r; end; $$ LANGUAGE plpgsql; select * from plpgsql_check_function('foo', extra_warnings =>false, compatibility_warnings => true); ┌────...
FUNCTION test_func() IS Cursor data_cursor IS SELECT * from test1; BEGIN FOR I IN data_cursor LOOP Do something with I; END LOOP; END; Conversion result: CREATE OR REPLACE FUNCTION test_func() AS $body$ DECLARE data_cursor cursor for select *...
DTS does not migrate the following types of data: CURSOR, ROWVERSION, SQL_VARIANT, HIERARCHYID, POLYGON, GEOMETRY, and GEOGRAPHY. If you select tables as the objects to be migrated, you can modify the mapping relation between columns. If column mapping is u...