import{z}from'zod';import{queryValidatedCursor}from'@prairielearn/postgres';constUserSchema=z.object({id:z.string(),name:z.string(),});constcursor=awaitqueryValidatedCursor(sql.select_all_users,{},UserSchema);forawait(constusersofcursor.iterate(100)){for(constuserofusers){console.log(user);}...
For example, granting the trigger privilege to a table allows users to create triggers; but, as opposed to Oracle, only the owner of the table can drop triggers. 8. Hierarchical queriesPostgres does not support the START WITH . . . CONNECT BY syntax that Oracle uses f...
例如,假设有一个名为users的表,其中包含一个名为trigger_example的触发器。你可以执行以下命令来手动调用触发器: 这里的column_name是表中的任意列名。通过将列设置为其当前值,不会实际更改任何数据,但会触发触发器的执行。 执行更新操作后,触发器将在每一行上执行定义的操作。你可以在触发器的定义中指定要执行...
CREATEORREPLACEPROCEDUREemp_job(p_empnoINOUTemp.empno%TYPE,p_enameINOUTemp.ename%TYPE,p_jobOUTemp.job%TYPE)ISv_empno emp.empno%TYPE;v_ename emp.ename%TYPE;v_job emp.job%TYPE;BEGINSELECTename,jobINTOv_ename,v_jobFROMempWHEREempno=p_empno;p_ename :=v_ename;p_job :=...
For example, if you have a table with two columns—id and value—and a stored procedure that adds one to each value in the table, you could write the following two functions to test this procedure: CREATEFUNCTIONunit_tests.add_one_positive()RETURNStest_resultAS$$ ...
CREATE OR REPLACE FUNCTION cp_simpleupdate(thekey integer, thevalue varchar(50)) RETURNS void AS $BODY$ UPDATE testtable SET test_stuff = $2 WHERE test_id = $1 $BODY$ LANGUAGE 'sql' VOLATILE;--Example use SELECT cp_simpleupdate(1, 'set to this'); ...
For this example, we’re working with one of our staging databases, and pick a relatively simple query that can benefit from JIT: SELECTCOUNT(*)FROMlog_linesWHERElog_classification=65AND(details->>'new_dead_tuples')::integer>=0;
CREATE OR REPLACE PROCEDURE etl.my_test_procedure() LANGUAGE sql AS $$ CREATE TEMP TABLE IF NOT EXISTS my_temp( var1 VARCHAR(255), var2 VARCHAR(255) ) ON COMMIT DROP; INSERT INTO my_temp ( var1, var2 ) SELECT table_schema,
Example: Stored Procedure --- CREATE PROCEDURE Test (n varying character,val REAL) DECLARE cid INTEGER; BEGIN SELECT custid INTO cid FROM account WHERE name=n; UPDATE checking SET balance=balance-val WHERE custid=cid; END; JDBC Code --...
We’ll have a lot more exciting improvements on the re-partitioning front over the next few releases as we introduce new infrastructure for INSERT..SELECT with re-partitioning, that will speed up joins as well. Stored procedure call delegation helps you avoid round trips Stored procedures are ...