PostgreSQL通过mysql_fdw连通MySQL实战

1）使用yum安装依赖和开发包
yum install postgresql-server-devel mysql-devel
2) 解压编译安装
unzip /opt/mysql_fdw-REL-2_9_3.zip -d /home/postgres
cd myql_fdw-REL-2_9_3
make USE_PGXS=1
make USE_PGXS=1 install

安装成功后，你需要重启 PostgreSQL服务，
或者至少让正在使用的数据库重新加载共享库。

1)加载扩展插件
CREATE EXTENSION mysql_fdw;
2)创建服务器对象
CREATE SERVER mysql_server 
FOREIGN DATA WRAPPER mysql_fdw 
OPTIONS (host '192.168.3.11', port '3306');
3) 授权
GRANT USAGE ON FOREIGN 
SERVER mysql_server TO postgres;

CREATE USER MAPPING FOR postgres
SERVER mysql_server
OPTIONS (username 'root', password 'root@A123');

CREATE FOREIGN TABLE warehouse (
warehouse_id int,
warehouse_name text,
warehouse_created timestamp
)SERVER mysql_server
OPTIONS (dbname 'aidb', table_name 'warehouse');

1）插入数据 
INSERT INTO warehouse values (1, 'UPS', current_date);
INSERT INTO warehouse values (2, 'TV', current_date);
INSERT INTO warehouse values (3, 'Table', current_date);
2）删除更新数据
DELETE FROM warehouse where warehouse_id = 3;
UPDATE warehouse set warehouse_name = 'UPS_NEW' where warehouse_id = 1;
3）查看 执行计划
EXPLAIN VERBOSE 
SELECT warehouse_id, warehouse_name 
FROM warehouse 
WHERE warehouse_name LIKE 'TV' limit 1;

IMPORT FOREIGN SCHEMA someschema
FROM SERVER mysql_server
INTO public;

查看所有外部表的定义
SELECT * FROM pg_foreign_table;
以标准 SQL 视角查看外部表
SELECT * FROM 
information_schema.foreign_tables;
查看 mysql_fdw 服务器的连接配置
SELECT * FROM pg_foreign_server;
查看连接到 MySQL 所用的用户名映射
SELECT * FROM pg_user_mappings;