MySql 查询数据库中所有表名以及对比分布式库中字段和表的不同

MySql 查询数据库中所有表名以及对比分布式库中字段和表的不同

查询数据库中所有表名select table_name from information_schema.tables where table_schema='数据库名' and table_type='base table';查询指定数据库中指定表的所有字段名column_nameselect column_name from information_schema.columns where table_schema='数据库名' and table_name='表名';

#查看分布式系统中不同库所有相同表名的comment的不同的表

select * from ( select TABLE_NAME, TABLE_COMMENT from information_schema.tables where table_schema='test1_1207_bak' and table_type='base table' ) aINNER JOIN ( select TABLE_NAME, TABLE_COMMENT from information_schema.tables where table_schema='test2_1207_bak' and table_type='base table' ) b on a.TABLE_NAME=b.TABLE_NAMEwhere a.TABLE_COMMENT!=b.TABLE_COMMENT;

#查看分布式库中同一表的同一字段类型,字段长度和comment等不同之处

select a.table_name,b.table_name,a.column_name,b.column_name,a.data_type,b.data_type,a.COLUMN_TYPE,b.COLUMN_TYPE,a.CHARACTER_MAXIMUM_LENGTH,b.CHARACTER_MAXIMUM_LENGTH,a.NUMERIC_PRECISION,b.NUMERIC_PRECISION,a.NUMERIC_SCALE,b.NUMERIC_SCALE,a.COLUMN_KEY,b.COLUMN_KEY,a.EXTRA,b.EXTRA,a.my_COLUMN_COMMENT,b.my_COLUMN_COMMENT from( select table_name,column_name,data_type,COLUMN_TYPE,CHARACTER_MAXIMUM_LENGTH,NUMERIC_PRECISION,NUMERIC_SCALE,COLUMN_KEY,EXTRA, CASE WHEN COLUMN_COMMENT is null THEN '' ELSE COLUMN_COMMENT END as my_COLUMN_COMMENT from information_schema.columns where table_schema='test2_1207_bak') aINNER JOIN ( select table_name,column_name,data_type,COLUMN_TYPE,CHARACTER_MAXIMUM_LENGTH,NUMERIC_PRECISION,NUMERIC_SCALE,COLUMN_KEY,EXTRA, CASE WHEN COLUMN_COMMENT is null THEN '' ELSE COLUMN_COMMENT END as my_COLUMN_COMMENT from information_schema.columns where table_schema='test1_1207_bak') b on a.table_name=b.table_name and a.column_name=b.column_name where a.data_type!=b.data_type or a.my_COLUMN_COMMENT!=b.my_COLUMN_COMMENT;

#查询缺失表语句：

select table_name from information_schema.tables where table_schema='test1_1207_bak' and table_type='base table' and table_name not in( select table_name from information_schema.tables where table_schema='test2_1207_bak' and table_type='base table' );

#改用存储过程实现为

# 对比不同库中表区别存储过程DROP PROCEDURE IF EXISTS p_find_dif_table;delimiter $$create procedure p_find_dif_table(database_name1 VARCHAR(100),database_name2 VARCHAR(100))begin -- 比较database_name1库表名与database_name2表名不同的表select table_name as db1_table_name from information_schema.tables where table_schema=database_name1 and table_type='base table' and table_name not in( select table_name from information_schema.tables where table_schema=database_name2 and table_type='base table' );-- 比较database_name2库表名与database_name1表名不同的表select table_name as db2_table_name from information_schema.tables where table_schema=database_name2 and table_type='base table' and table_name not in( select table_name from information_schema.tables where table_schema=database_name1 and table_type='base table' );end;$$delimiter ;-- 调用存储过程CALL p_find_dif_table('test1_1207_bak','test2_1207_bak');

#查询具体表缺失字段语句：

select column_name from information_schema.columns where table_schema='test2_1207_bak' and table_name='oi_auto' and column_name not in ( select column_name from information_schema.columns where table_schema='test1_1207_bak' and table_name='oi_auto' );

# 改用存储过程和游标实现，对比数据库缺失字段

drop TABLE if EXISTS `release_no_field`;CREATE TABLE `release_no_field` ( `column_name` varchar(255), `table_name` varchar(255), `db_name` varchar(255)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='正式库中缺失字段';drop TABLE if EXISTS `beta_no_field`;CREATE TABLE `beta_no_field` ( `column_name` varchar(255), `table_name` varchar(255), `db_name` varchar(255)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='测试库中缺失字段';# 对比不同库中缺失字段存储过程DROP PROCEDURE IF EXISTS p_find_dif_column;delimiter $$create procedure p_find_dif_column(release_db VARCHAR(100),beta_db VARCHAR(100))begin DECLARE cur_table VARCHAR(100); DECLARE no_more_record INT DEFAULT 0; DECLARE cur_record CURSOR FOR SELECT TABLE_NAME from information_schema.tables where table_schema=release_db and table_type='base table' and TABLE_NAME not in('release_no_field','beta_no_field'); DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_record = 1; OPEN cur_record; FETCH cur_record INTO cur_table; delete from release_no_field; delete from beta_no_field; WHILE no_more_record != 1 DO -- 正式库中缺失字段 INSERT INTO release_no_field(column_name,table_name,db_name) select column_name,table_name,release_db from information_schema.columns where table_schema=beta_db and table_name=cur_table and column_name not in ( select column_name from information_schema.columns where table_schema=release_db and table_name=cur_table ); -- 测试库中缺失字段 INSERT INTO beta_no_field(column_name,table_name,db_name) select column_name,table_name,beta_db from information_schema.columns where table_schema=release_db and table_name=cur_table and column_name not in ( select column_name from information_schema.columns where table_schema=beta_db and table_name=cur_table ); FETCH cur_record INTO cur_table; END WHILE; CLOSE cur_record; SELECT * from release_no_field; SELECT * from beta_no_field;end;$$delimiter ;

对比不同库同一表同一字段类型不一致

SELECT hosp_release.table_name AS table_name, hosp_release.column_name AS column_name, hosp_release.column_type AS hosp_release_column_type, hosp_beta.column_type AS hosp_beta_column_type FROM ( select table_name,column_name,column_type from information_schema.columns where table_schema='hosp2' and table_name in ( select TABLE_NAME from information_schema.tables where table_schema='hosp2' and table_type='base table' )) hosp_release , ( select table_name,column_name,column_type from information_schema.columns where table_schema='hosp_shunde_0226' and table_name in ( select TABLE_NAME from information_schema.tables where table_schema='hosp_shunde_0226' and table_type='base table' )) hosp_betaWHERE hosp_release.table_name=hosp_beta.table_name and hosp_release.column_name=hosp_beta.column_name and hosp_release.column_type!=hosp_beta.column_type

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