To create a new SQL statement, you must first import the DB schema into your simple project.
要创建新的sql语句，必须先将DB模式导入到简单项目中。
The first parameter marker is to hold the relational schema or the DB owner name of the registered annotated XML schema.
第一个参数标记符用于存放注册的带注释的XML模式的关系模式或db所有者名称。
It contains information regarding your data source (DB URL, schema name, username, password, etc.) and references to other configuration files that will contain your mapping information.
它包含与数据源有关的信息(数据库url、模式名称、用户名、口令等)，以及对包含映射信息的其他配置文件的引用。
In addition, you can use DB-Access to display catalog tables and information schema.
另外，您可以使用DBA显示目录表和信息模式。
We will build the tables in our database using the rake db: test: prepare command. Running this command will duplicate the schema from the development database into the test database.
我们用rakedb：test：prepare命令在数据库中建立表。
We will build the tables in our database using the rake db: test: prepare command. Running this command will duplicate the schema from the development database into the test database.
我们用rakedb：test：prepare命令在数据库中建立表。
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