Checking Whether a String Contains a Substring

4.6.1 Problem

You want to know whether a given string occurs within another string.

4.6.2 Solution

Use LOCATE( ).

4.6.3 Discussion

The LOCATE( ) function takes two arguments representing the substring that you're looking for and the string in which to look for it. The return value is the position at which the substring occurs, or 0 if it's not present. An optional third argument may be given to indicate the position within the string at which to start looking.

mysql> SELECT name, LOCATE('in',name), LOCATE('in',name,3) FROM metal;
+----------+-------------------+---------------------+
| name | LOCATE('in',name) | LOCATE('in',name,3) |
+----------+-------------------+---------------------+
| copper | 0 | 0 |
| gold | 0 | 0 |
| iron | 0 | 0 |
| lead | 0 | 0 |
| mercury | 0 | 0 |
| platinum | 5 | 5 |
| silver | 0 | 0 |
| tin | 2 | 0 |
+----------+-------------------+---------------------+

LOCATE( ) is not case sensitive as of MySQL 4.0.0, and is case sensitive before that.

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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