postgrel中写一个存储过程,需求是 创建一个用户表,在创建一个分区表,在每个月26号的时候向这个分区表更新插入一遍分区表
时间: 2023-02-26 08:07:11 浏览: 81
下面是一个例子,该存储过程创建一个用户表并创建一个分区表。每个月26日,它会向该分区表中插入数据:
```
CREATE OR REPLACE FUNCTION update_partitioned_table()
RETURNS VOID AS $$
DECLARE
partition_name TEXT;
current_date TIMESTAMP;
BEGIN
-- Create the main table if it doesn't exist
CREATE TABLE IF NOT EXISTS users (
id SERIAL PRIMARY KEY,
name TEXT NOT NULL,
email TEXT NOT NULL
);
-- Create the partitioned table if it doesn't exist
CREATE TABLE IF NOT EXISTS users_partitioned (
CHECK (created_at >= date_trunc('month', created_at))
) INHERITS (users);
-- Get the current date
SELECT NOW() INTO current_date;
-- If today is the 26th of the month, update the partitioned table
IF EXTRACT(DAY FROM current_date) = 26 THEN
-- Generate the name of the partition to be created
partition_name := 'users_' || TO_CHAR(current_date, 'YYYY_MM');
-- Create the partition if it doesn't exist
EXECUTE 'CREATE TABLE IF NOT EXISTS ' || partition_name || ' (
CHECK (created_at >= ''2022-01-01'' AND created_at < ''2022-02-01'')
) INHERITS (users_partitioned);';
-- Insert data into the partition
EXECUTE 'INSERT INTO ' || partition_name || ' SELECT * FROM users WHERE created_at >= ''2022-01-01'' AND created_at < ''2022-02-01''';
END IF;
END;
$$ LANGUAGE plpgsql;
```
该存储过程使用PL/pgSQL编写,并使用`EXECUTE`语句执行动态SQL。需要注意的是,该代码中的分区表的示例数据时间范围仅为示例,需要根据实际需求进行修改。