问题描述
据我了解，一旦执行
Class.forName("net.sourceforge.jtds.jdbc.Driver");
我初始化应用程序以全局使用JTDS SQL Server驱动程序，并且
I initialize the application to use JTDS SQL Server driver globally and
java.sql.DriverManager.getConnection(url, user, password);
之后将全部返回SQL Server连接.
returns SQL Server connections all after that.
但是，如果我想在同一功能中使用多个不同的数据库引擎，先获得JTDS SQL Server连接，然后再获得一个PostgreSQL连接，然后再重新建立一个新的JTDS SQL Server连接，该怎么办?
But what if I want to work with multiple different database engines in the same function, getting a JTDS SQL Server connection, then, for example a PostgreSQL connection and then a new JTDS SQL Server connection again?
推荐答案
您误会了.当您使用Class.forName()加载驱动程序类时，该驱动程序会在驱动程序管理器中注册自己.您可以使用任意数量的驱动程序来完成此操作.
You misunderstand. When you load a driver class with Class.forName(), that driver registers itself with the driver manager. You can do this with as many drivers as you want.
getConnection()的第一个参数是一个URL，它将唯一地标识用于该连接的驱动程序.
The first parameter of getConnection() is a URL that will uniquely identify the driver to use for that connection.
但是，我建议您使用连接池(例如 Apache DBCP ).这样一来，您就可以根据需要获得连接，并提供一些其他功能，例如，如果忘记将连接返回到池中，则会发出警告.
However, rather than getting connections directly from the driver manager, I recommend that you use a connection pool (such as Apache DBCP). This will let you get connections on an as-needed basis, and will provide some additional functionality such as warning you if you forget to return the connection to the pool.
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