PostgreSQL for in loop 模板是 FORvarINREVERSE1..10LOOP statement_list END LOOP; REVERSE 不知道什么意思…… 一般用的是 FORvarIN1..10LOOP statement_listENDLOOP; 如果是navicate for+tab出来的模板,需要自己手动定义值,不然是不生效的。 var是一个变量,它刚开始的时候是等于1..10中的1,可以对var进行...
/* Open up a cursor for loop, also selecting * the "p" function which will write rows to * t2 for every row fetched from t1. */ FOR crec IN (Select tcol, p(tcol) FROM t1) LOOP -- Break out of the loop immediately EXIT; END LOOP; END; / Select COUNT(*) FROM t2; 注意:%...
In this code, we create a TEXT array that contains four elements. After this, we iterate over the given array via a for loop and display all array elements using a “RAISE NOTICE” statement: Example 3: Iterating For Loop in Reverse Order Specifying the “REVERSE” keyword in for loop’...
for [循环计数器] in [REVERSE] [下限]..[上限] loop 代码; end loop; 2.例子: CREATE OR REPLACE PROCEDURE PROC_FOR1 (a IN OUT INT) AS BEGIN FOR I IN REVERSE 1 .. a LOOP PRINT I; a:=I-1; END LOOP; END; call proc_for1(5); 结果: 5 4 3 2 1 四、REPEAT语句 1.语法: REP...
从1开始到形参a2 FOR i IN 1..a2 LOOP 从100开始到形参a2 FOR i IN 100..a2 LOOP 当循环结束的时候要加上“end loop;”(注意不要少了分号“;”) 函数的调用: -- SQL 代码块 SELECTtest_for(array[1,4,5,6,7,8],6742) 循环一个可迭代对象,即对数组的遍历,分为三种情况,目前我还在学习中, ...
ENDLOOP;这段代码会从fields数组中获取字段的元素，然后将其用于语句中。通过使用这个简单的for循环，我们就可以非常快速、高效地创建一个表。您还可以使用for循环来为表中的每个字段创建索引，以提高检索速度：FOR i IN array_lower(fields, 1)..array_upper(fields, 1)EXECUTE 'CREATE INDEX ON products (' ，...
wait_for_port_open wait_for_port_open函数输入postmasterProcess对象,输入等待时间。 def wait_for_port_open(self, postmaster, timeout): """Waits until PostgreSQL opens ports.""" for _ in polling_loop(timeout): if self.cancellable.is_cancelled: return False # 可取消 if not postmaster.is_runn...
问未在PostgreSQL中的for-in循环内调用的函数EN今天领导提个需求，要求在金额上强制保留两位小数，本想着...
fornotifyinconn.notifies: print(notify.payload) attach_partition(notify.channel, notify.payload) conn.notifies.clear() loop=asyncio.get_event_loop() loop.add_reader(conn, handle_notify) loop.run_forever() 总结 本文向您介绍了两种自动创建分区的方案,以下为每种方案的总结分析: ...
That’s all about using a “CONTINUE” statement in PostgreSQL. Conclusion In PostgreSQL, loops are used in the queries to perform single code/statements for multiple rows in the table. The continue statement can be integrated with the loop to skip the values that satisfy the condition mentioned...