fennykk opened a new issue #2863: Can I change DataSourceMetaData's pattern ? URL: https://github.com/apache/incubator-shardingsphere/issues/2863 **i have 128 databases**, if i use druid for database pool, it will create **256 threads** for these databases, but these threads are useless, maybe 2 threads is enough. so i use my company database pool called "caelus", it can change the database dynamic, and its core call like this: `String jdbcUrl = "jdbc:mysql://127.0.0.1:3306?useUnicode=true";` `Connection connection = DriverManager.getDriver(jdbcUrl).connect(jdbcUrl, driverProperties);` `connection.setCatalog("database001");` caelus use setCatalog to change the actual database when i use druid , the connection may like this `String jdbcUrl = "jdbc:mysql://127.0.0.1:3306/database001?useUnicode=true";` `Connection connection = DriverManager.getDriver(jdbcUrl).connect(jdbcUrl, driverProperties);` at lastest shardingsphere version , MySQLDataSourceMetaData will check the jdbcUrl the pattern like `private final Pattern pattern = Pattern.compile("jdbc:mysql:(\\w*:)?//([\\w\\-\\.]+):?([0-9]*)/([\\w\\-]+);?\\S*", Pattern.CASE_INSENSITIVE);` so when i use the lastest version , my jdbcUrl is invalid because the metaData url is `jdbc:mysql://127.0.0.1:3306?useUnicode=true` finally i found no way to change this pattern , so i can only use the old version 2.0.3
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