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为打开的连接更改当前数据库。
Public Overrides Sub ChangeDatabase(ByVal connectionString As String)
public override void ChangeDatabase(string connectionString)
connectionString 用于打开新数据库连接的完整连接字符串。
即使存在参数错误，也会关闭与当前数据库的连接。
UL Ext：connectionString 为完整的连接字符串，而不是 dbn 或 dbf 值。
Visual Basic 语法