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Migrate database engine from MySQL to SQLite: Difference between revisions
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Migrate database engine from MySQL to SQLite (edit)
Revision as of 07:42, 13 November 2019
, 13 November 2019→Steps of migration database engine from MySQL to SQLite
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== Notes == | Steps of migration database engine from MySQL to SQLite | ||
== Steps of migration database engine from MySQL to SQLite == | |||
# Migrate database data from MySQL to SQLite using the [[SQLite management software]] | |||
# Modify the scripts of database connection and SQL query syntax because some MySQL functions are not compatible in SQLite | |||
# Testing the scripts | |||
== Notes of modification of scripts == | |||
* Remove database name from SQL query: SQLite will consider the database name as table name | * Remove database name from SQL query: SQLite will consider the database name as table name | ||
* In MySQL, string are able to quoted with single quote symbol {{kbd | key=<nowiki>'</nowiki>}} or double quote symbol {{kbd | key=<nowiki>"</nowiki>}}. In SQLite the string quoted with double quote symbol will be considered as '''column name'''! It will cause the problem: "no such column: xxx" | * In MySQL, string are able to quoted with single quote symbol {{kbd | key=<nowiki>'</nowiki>}} or double quote symbol {{kbd | key=<nowiki>"</nowiki>}}. In SQLite the string quoted with double quote symbol will be considered as '''column name'''! It will cause the problem: "no such column: xxx" | ||
* Replace the following functions | * Replace the following functions | ||
** Replace MySQL [https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_char-length CHAR_LENGTH] function with SQLite [https://www.sqlitetutorial.net/sqlite-functions/sqlite-length/#targetText=SQLite%20Length,returns%20the%20number%20of%20bytes. Length] function<ref>[https://github.com/owncloudarchive/mozilla_sync/issues/47 sqlite does not have CHAR_LENGTH function · Issue #47 · owncloudarchive/mozilla_sync]</ref> | ** Replace MySQL [https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_char-length CHAR_LENGTH] function with SQLite [https://www.sqlitetutorial.net/sqlite-functions/sqlite-length/#targetText=SQLite%20Length,returns%20the%20number%20of%20bytes. Length] function<ref>[https://github.com/owncloudarchive/mozilla_sync/issues/47 sqlite does not have CHAR_LENGTH function · Issue #47 · owncloudarchive/mozilla_sync]</ref> | ||
** Replace MySQL {{kbd | key=IF}} function with SQLite {{kbd | key=CASE}} function | ** Replace MySQL {{kbd | key=IF}} function with SQLite {{kbd | key=CASE}} function<ref>[https://www.sqlitetutorial.net/sqlite-case/ SQLite CASE Expression: Simple CASE & Search CASE]</ref> | ||
** Replace MySQL {{kbd | key=LOCATE}} function<ref>[https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_locate MySQL :: MySQL 8.0 Reference Manual :: 12.5 String Functions and Operators]</ref> with SQLite INSTR {{kbd | key=CASE}} function<ref>[https://www.sqlitetutorial.net/sqlite-functions/sqlite-instr/ SQLite INSTR]</ref> | ** Replace MySQL {{kbd | key=LOCATE}} function<ref>[https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_locate MySQL :: MySQL 8.0 Reference Manual :: 12.5 String Functions and Operators]</ref> with SQLite INSTR {{kbd | key=CASE}} function<ref>[https://www.sqlitetutorial.net/sqlite-functions/sqlite-instr/ SQLite INSTR]</ref> | ||
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</pre> | </pre> | ||
* Other functions not supported: SET | * Other functions are not supported such as: SET, Truncate<ref>[https://www.runoob.com/sqlite/sqlite-truncate-table.html SQLite Truncate Table | 菜鸟教程]</ref>, INGORE | ||
== References == | == References == | ||
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[[Category:MySQL]] | [[Category:MySQL]] | ||
[[Category:SQLite]] | [[Category:SQLite]] | ||
[[Category:Tool]] | |||