Determining the Current Database

9.15.1 Problem

Has any database been selected as the current database? What is its name?

9.15.2 Solution

Use the DATABASE( ) function.

9.15.3 Discussion

SELECT DATABASE( ) returns the name of the current database, or the empty string if no database has been selected. This Python code uses the statement to present a status display containing information about the current connection:

cursor = conn.cursor ( )
cursor.execute ("SELECT DATABASE( )")
row = cursor.fetchone ( )
cursor.close
if row == None or len (row) == 0 or row[0] == "":
 db = "(no database selected)"
else:
 db = row[0]
print "Current database:", db

Using the mysql Client Program

Writing MySQL-Based Programs

Record Selection Techniques

Working with Strings

Working with Dates and Times

Sorting Query Results

Generating Summaries

Modifying Tables with ALTER TABLE

Obtaining and Using Metadata

Importing and Exporting Data

Generating and Using Sequences

Using Multiple Tables

Statistical Techniques

Handling Duplicates

Performing Transactions

Introduction to MySQL on the Web

Incorporating Query Resultsinto Web Pages

Processing Web Input with MySQL

Using MySQL-Based Web Session Management

Appendix A. Obtaining MySQL Software

Appendix B. JSP and Tomcat Primer

Appendix C. References



MySQL Cookbook
MySQL Cookbook
ISBN: 059652708X
EAN: 2147483647
Year: 2005
Pages: 412
Authors: Paul DuBois

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