可遇不可求的Question之MySql4.0前版本不支持union与批量SQL提交

批量SQL提交

参考 21.2.6. Connector/NET Connection String Options Reference 。

Allow Batch

true

When true, multiple SQL statements can be sent with one command execution. -Note- Starting with MySQL 4.1.1, batch statements should be separated by the server-defined separator character. Commands sent to earlier versions of MySQL should be separated with ';'.

Allow Batch 只从MySQL 4.1.1之后 才支持.

union 在3.0版本中是不支持的.

12.2.7. SELECT Syntax

http://dev.mysql.com/doc/refman/4.1/en/select.html

Support for UNION statements and subqueries is available as of MySQL 4.0 and 4.1, respectively. See Section 12.2.7.3, “UNION Syntax”, and Section 12.2.8, “Subquery Syntax”.

12.2.7.3. UNION Syntax

SELECT ...
UNION [ALL | DISTINCT] SELECT ...
[UNION [ALL | DISTINCT] SELECT ...]

UNION is used to combine the result from multiple SELECT statements into a single result set. UNION is available from MySQL 4.0.0 on.