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Changes
→PostgreSQL and MySQL
: [http://www.mysql.com/downloads/connector/j/ Mysql Connector]
: Retrieving AUTO_INCREMENT Column Values [http://dev.mysql.com/doc/refman/5.0/en/connector-j-usagenotes-basic.html#connector-j-usagenotes-last-insert-id]
: LikeEscape:
::
Note
Because MySQL uses C escape syntax in strings (for example, “\n” to represent a newline character), you must double any “\” that you use in LIKE strings. For example, to search for “\n”, specify it as “\\n”. To search for “\”, specify it as “\\\\”; this is because the backslashes are stripped once by the parser and again when the pattern match is made, leaving a single backslash to be matched against.
Exception: At the end of the pattern string, backslash can be specified as “\\”. At the end of the string, backslash stands for itself because there is nothing following to escape. Suppose that a table contains the following values:
mysql> SELECT filename FROM t1;
+--------------+
| filename |
+--------------+
| C: |
| C:\ |
| C:\Programs |
| C:\Programs\ |
+--------------+
To test for values that end with backslash, you can match the values using either of the following patterns:
mysql> SELECT filename, filename LIKE '%\\' FROM t1;
+--------------+---------------------+
| filename | filename LIKE '%\\' |
+--------------+---------------------+
| C: | 0 |
| C:\ | 1 |
| C:\Programs | 0 |
| C:\Programs\ | 1 |
+--------------+---------------------+
mysql> SELECT filename, filename LIKE '%\\\\' FROM t1;
+--------------+-----------------------+
| filename | filename LIKE '%\\\\' |
+--------------+-----------------------+
| C: | 0 |
| C:\ | 1 |
| C:\Programs | 0 |
| C:\Programs\ | 1 |
+--------------+-----------------------+
*The current versions are MySQL 5.1 and PostgreSQL 8.4.
#PostgreSQL is a unified database server with a single storage engine. MySQL has two layers, an upper SQL layer and a set of storage engines. [http://www.wikivs.com/wiki/MySQL_vs_PostgreSQL]
