Question

我想在MySQL中使用架构数据库进行查询它显示了两个数据库模式之间的列，触发器和存储过程之间的区别：生产和开发。

查询，而不是工具
我见过Compare two MySQL databases
其中列出了可以执行此任务的工具，但我想知道是否有查询可以执行此任务。
请仅建议查询，我真的不想了解工具，命令行黑客等。

我正在查看生产数据库和开发数据库是否不同步以及添加或更改了哪些字段，过程等，因此如果我推出使用该数据库的客户端软件的新更新，我可以更新生产数据库。

我正在使用MySQL 5.1最新版本。

Answer 1

Johan，尝试运行此脚本。在脚本开头指定要在变量中比较的两个数据库。查询返回数据集，并设置表/视图列的状态。

状态'仅在源'中 - 对象仅存在于db1中; 状态'仅在目标' - 对象仅存在于db2中; 状态'在两个模式中' - 对象存在于db1和db2中，但细节可能不同;例如：value'varchar（255）/ int（11）'表示源字段类型为'varchar（255）'，target为'int（11）'，值'null'表示细节相等;

SET @source_db = 'db1';
SET @target_db = 'db2';

SELECT 
  'Only in source' exist_type,
  c1.table_schema, c1.table_name, c1.column_name, c1.ordinal_position, c1.column_default, c1.is_nullable, c1.numeric_precision, c1.numeric_scale, c1.character_set_name, c1.collation_name, c1.column_type, c1.column_key, c1.extra, c1.column_comment
FROM
  (SELECT * FROM information_schema.columns WHERE TABLE_SCHEMA = @source_db) c1
  LEFT JOIN (SELECT * FROM information_schema.columns WHERE TABLE_SCHEMA = @target_db) c2
    ON c1.TABLE_name = c2.TABLE_name AND c1.column_name = c2.column_name
WHERE c2.column_name is null

UNION ALL

SELECT
  'Only in target' exist_type,
  c2.table_schema, c2.table_name, c2.column_name, c2.ordinal_position, c2.column_default, c2.is_nullable, c2.numeric_precision, c2.numeric_scale, c2.character_set_name, c2.collation_name, c2.column_type, c2.column_key, c2.extra, c2.column_comment
FROM
  (SELECT * FROM information_schema.columns WHERE TABLE_SCHEMA = @source_db) c1
  RIGHT JOIN (SELECT * FROM information_schema.columns WHERE TABLE_SCHEMA = @target_db) c2
    ON c1.TABLE_name = c2.TABLE_name AND c1.column_name = c2.column_name
WHERE c1.column_name is null

UNION ALL

SELECT 
  'In both schemas' exist_type,
  CONCAT(c1.table_schema, '/', c2.table_schema),
  c1.table_name, c1.column_name,
  IF(c1.ordinal_position = c2.ordinal_position OR c1.ordinal_position IS NULL AND c2.ordinal_position IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.ordinal_position, ''), IFNULL(c2.ordinal_position, ''))),
  IF(c1.column_default = c2.column_default OR c1.column_default IS NULL AND c2.column_default IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.column_default, ''), IFNULL(c2.column_default, ''))),
  IF(c1.is_nullable = c2.is_nullable OR c1.is_nullable IS NULL AND c2.is_nullable IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.is_nullable, ''), IFNULL(c2.is_nullable, ''))),
  IF(c1.numeric_precision = c2.numeric_precision OR c1.numeric_precision IS NULL AND c2.numeric_precision IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.numeric_precision, ''), IFNULL(c2.numeric_precision, ''))),
  IF(c1.numeric_scale = c2.numeric_scale OR c1.numeric_scale IS NULL AND c2.numeric_scale IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.numeric_scale, ''), IFNULL(c2.numeric_scale, ''))),
  IF(c1.character_set_name = c2.character_set_name OR c1.character_set_name IS NULL AND c2.character_set_name IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.character_set_name, ''), IFNULL(c2.character_set_name, ''))),
  IF(c1.collation_name = c2.collation_name OR c1.collation_name IS NULL AND c2.collation_name IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.collation_name, ''), IFNULL(c2.collation_name, ''))),
  IF(c1.column_type = c2.column_type OR c1.column_type IS NULL AND c2.column_type IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.column_type, ''), IFNULL(c2.column_type, ''))),
  IF(c1.column_key = c2.column_key OR c1.column_key IS NULL AND c2.column_key IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.column_key, ''), IFNULL(c2.column_key, ''))),
  IF(c1.extra = c2.extra OR c1.extra IS NULL AND c2.extra IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.extra, ''), IFNULL(c2.extra, ''))),
  IF(c1.column_comment = c2.column_comment OR c1.column_comment IS NULL AND c2.column_comment IS NULL, NULL, CONCAT_WS('/', IFNULL(c1.column_comment, ''), IFNULL(c2.column_comment, '')))
FROM
  (SELECT * FROM information_schema.columns WHERE TABLE_SCHEMA = @source_db) c1
  JOIN (SELECT * FROM information_schema.columns WHERE TABLE_SCHEMA = @target_db) c2
    ON c1.TABLE_name = c2.TABLE_name AND c1.column_name = c2.column_name;

可以修改此脚本以查找触发器和例程之间的差异。

Answer 2

您所关注的所有数据都应位于information_schema数据库的表格中。

您可能能够与某种仅显示差异的联接进行比较，但尝试在查询或单个查询中执行此操作似乎是一种过于复杂的方法来解决问题，我想你是用脚射击自己。

快速简便的解决方案是diff每个数据库mysqldump --no-data的内容，或者从信息模式中提取数据并进行差异化。

Answer 3

t1与t2相比

select 
 (case t1.table_name=t2.table_name when 1 then concat(t1.table_name,"==",t2.table_name) else concat(t1.table_name,"!=",t2.table_name) end) as table_name,
 (case t1.column_name=t2.column_name when 1 then concat(t1.column_name,"==", t2.column_name) else concat(t1.column_name,"!=", t2.column_name) end) as column_name,
 (case t1.ORDINAL_POSITION=t2.ORDINAL_POSITION when 1 then concat(t1.ORDINAL_POSITION,"==", t2.ORDINAL_POSITION) else concat(t1.ORDINAL_POSITION,"!=", t2.ORDINAL_POSITION) end) as ORDINAL_POSITION
......--columns in information_schema
from columns t1 left join (select * from columns where table_schema='t2') t2 on t2.table_name=t1.table_name and t2.column_name=t1.column_name where t1.table_schema='t1';

希望这有帮助!!

Answer 4

Johan你已经缩小了你的答案域，说你想要一个“查询”来比较数据库：）

但是我的建议是考虑“二进制日志记录”。我已经成功地将它用于类似目的。

       a) enable logs 
       b) Go through all binary logs files 
       c) grep desired statements
       d) at then end purge/reset binary logs  ie. RESET MASTER

显然你会在生产数据库上执行此操作。

其他方式可能是：How to synchronize development and production database

Answer 5

这是一个古老的，但它的确有效。在devart的例子的基础上，我继续建立了程序和功能的比较：

SET @source_db = 'qls_projects_for_comparison';
SET @target_db = 'qls_projects';

-- Pick one and comment out the other
-- SET @routine_type = 'FUNCTION';
SET @routine_type = 'PROCEDURE';

-- Get the ones only in the source
SELECT
  'Only in SOURCE' exist_type, C1.ROUTINE_NAME, C1.ROUTINE_SCHEMA,         
C1.ROUTINE_TYPE, C1.LAST_ALTERED, C1.DEFINER as 'Source Definer', C2.DEFINER 
as     'Target Definer', def_compare as 'Compare Definitions'  
FROM (    
(SELECT *,'' as def_compare FROM INFORMATION_SCHEMA.ROUTINES WHERE 
ROUTINE_TYPE = @routine_type AND ROUTINE_SCHEMA = @source_db) C1
LEFT JOIN (SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 
@routine_type AND ROUTINE_SCHEMA = @target_db) C2
ON C1.ROUTINE_NAME = C2.ROUTINE_NAME
)
WHERE C2.ROUTINE_NAME IS NULL

UNION ALL

-- Get the ones only in the target
SELECT
  'Only in TARGET' exist_type, C2.ROUTINE_NAME, C2.ROUTINE_SCHEMA,             
C2.ROUTINE_TYPE, C2.LAST_ALTERED, C1.DEFINER as 'Source Definer', C2.DEFINER 
as 'Target Definer', def_compare as 'Compare Definitions'  
FROM (    
(SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 
@routine_type AND ROUTINE_SCHEMA = @source_db) C1
RIGHT JOIN (SELECT *,'' as def_compare FROM INFORMATION_SCHEMA.ROUTINES 
WHERE ROUTINE_TYPE = @routine_type AND ROUTINE_SCHEMA = @target_db) C2
ON C1.ROUTINE_NAME = C2.ROUTINE_NAME
)
WHERE C1.ROUTINE_NAME IS NULL

UNION ALL

-- Get the ones in both and compare the bodies of the routines 

SELECT 
'In both schemas' exist_type
, C2.ROUTINE_NAME
, C2.ROUTINE_SCHEMA
, C2.ROUTINE_TYPE
, C2.LAST_ALTERED
, C1.DEFINER as 'Source Definer'
, C2.DEFINER as 'Target Definer', 
IF(C1.ROUTINE_DEFINITION=C2.ROUTINE_DEFINITION, 'Matches','Does Not Match') 
as 'Compare Definitions'
FROM (    
   (SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 
@routine_type AND ROUTINE_SCHEMA = @source_db) C1
  INNER JOIN (SELECT * FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 
@routine_type AND ROUTINE_SCHEMA = @target_db) C2
    ON C1.ROUTINE_NAME = C2.ROUTINE_NAME
)

MySQL查询显示开发和生产模式之间的差异

5 个答案: