我想使用 MySQL
中的模式数据库进行查询，以显示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
我见过的工具比较两个 MySQL 数据库
其中列出了可以执行此任务的工具，但我想知道是否有可以执行此任务的查询。
请只提出疑问，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。
约翰，试着运行这个脚本。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“仅在目标中”- 对象仅存在于 db2 中；状态 'In both schemas' - 对象存在于 db1 和 db2 中，但细节可能不同；例如： value 'varchar(255)/int(11)' 表示源字段类型是 'varchar(255)' 而目标是 'int(11)'， value 'null' 表示细节是相等的；
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。
您需要的所有数据都应该在information_schema数据库的表中。
您可能可以使用某种仅向您显示差异的连接进行比较，但尝试在查询或单个查询中进行比较似乎是解决问题的一种过于复杂的方法，我认为您是在自欺欺人脚。
快速简便的解决方案是获取每个数据库diff的内容，mysqldump --no-data或者从信息模式中提取数据并对其进行比较。
约翰你已经通过说你想要一个“查询”来比较数据库来缩小你的回答范围:)
但是，我对您的建议是考虑“二进制日志记录”。我已经成功地将它用于类似的目的。
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，您将在生产数据库上执行此操作。
其他方式可能是：如何同步开发和生产数据库
t1 与 t2 比较
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！
这是一个古老的，但它的工作原理。基于 devart 的示例，我继续构建过程和函数的比较：
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
)