sharding-proxy hang-up when entering "use sharding-db" instruction

[cherrylzhao]

For English only, other languages we will close it directly.

Please answer these questions before submitting your issue. Thanks!

Which version of Sharding-Sphere do you using?

sharding-proxy 3.0.0.M2-SNAPSHOT

Expected behavior

"use sharing_db" instructions can return successfully.

Actual behavior

suspended in command-line

Steps to reproduce the behavior

• mysql -h127.0.0.1 -P3307 -uroot -proot
• use sharding_db

Please provide the reproduce example codes (such as a github link).

[tristaZero]

When the DataSourceName configured is different with the actual database name, the statement 'SHOW COLUMNS FROM tbl_name [FROM db_name] ' will get error. This is because the sharding SQLBuilder can not can the actual database name to replace the defualt database name.

So, this enhancement will analyze JDBC Url to get the actual database name to replace the defualt database name.

[tristaZero]

fixed in Support authorization parsing for Sharding core #996.