Getting Server Metadata
Problem
You want to the MySQL server to tell you about itself.
Solution
Several SELECT
and SHOW
statements return information about the server.
Discussion
MySQL offers several SQL
statements that provide you with information about the server itself
and about your current client connection. A few that you may find
useful are listed here. To obtain the information provided by any of
them, issue the query, then process the result set to retrieve the
query output. Both SHOW
statements allow a
LIKE
'
pattern
'
clause for limiting the results only to those rows matching the
pattern.
Statement |
Information produced by statement |
---|---|
|
Server version string |
|
Current database name (empty if none) |
|
Current username |
|
Server status indicators |
|
Server configuration variables |
These queries are all MySQL-specific. If you’re working in Java, JDBC provides several database-independent methods for obtaining server metadata, some of which provide the same information as some of the preceding statements. Use your connection object to obtain the database metadata, then invoke the appropriate methods to get the information in which you’re interested. You should consult a JDBC reference for a complete list, but here are a few representative examples:
DatabaseMetaData md = conn.getMetaData ( ); // can also get this with SELECT VERSION( ) System.out.println ("Product version: " + md.getDatabaseProductVersion ...
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