每个定义的XA资源都必须具有唯一的数据库名称，此名称需与相关代码建立到数据源的连接时使用的名称匹配。
Each XA resource defined must have a unique database name that matches the name used when the relevant code makes its connection to the data source.
在执行时，当建立数据库连接时，确定用户应用程序代码页，而且它只在连接期间有效。
At execution time, the user application code page is established when a database connection is made, and it is in effect for the duration of the connection.
此外，由于SQL架构与数据库访问代码不匹配造成的缺陷也可以完全避免，因为SQL架构和访问代码都是由生成器建立的。
In addition, any bugs that occur when the SQL schema doesn't match the database access code are all but eliminated because the generator builds both the SQL schema and the access code.
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