MySQL实现跨服务器查询 https://blog.csdn.net/LYK_for_dba/article/details/78180444 mysql> create database lianxi; mysql> use lianxi mysql> CREATE TABLE tab_test_fed ( id int(20) NOT NULL auto_increment, name varchar(32) NOT NULL default '', PRIMARY K
库1 gxjob 库2 funshixi SELECT a.`company_id`,b.`companyname` FROM `gxjob`.`qj_activity_thousands_of_schools` AS a LEFT JOIN `funshixi`.`qj_company` AS b ON a.company_id = b.companyid;
业务场景: 当一个公司大了之后就会将各种业务进行分开,最简单的就是例如:公司的机构表,那么就会将他们分成开来,那么就会在一个实例中, 如果要获取相关信息就会去关联这张表进行关联查询 从而导致了跨库关联多表查询: 首先看sql: select f.id as id, m.name as name from fr_db.person f left join mall.person_test m on f.id =m.pid where f.id = #{id,jdbcType=INTEGER} 这个
一:跨库查询 Openrowset/opendatasource() is an ad-hoc method to access remote server's data. So, if you only need to access the remote server's data once and you do not to persist the connection info, this would be the right choice. Otherwise, you should c
前一段时间在工作中遇到了跨库事务问题,后来在网上查询了一下,现在做一下整理和总结. 1.首先要确保mysql开启XA事务支持 SHOW VARIABLES LIKE '%XA%' 如果innodb_support_xa的值是ON就说明mysql已经开启对XA事务的支持了. 如果不是就执行: SET innodb_support_xa = ON <?PHP $dbtest1 = new mysqli("172.20.101.17","public","