Migrate database engine from MySQL to SQLite: Difference between revisions

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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"
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* Other functions are not supported such as: 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
 
== SQLite management software ==
Comparison of SQLite management softwares
 
[https://sqlitebrowser.org/ DB Browser for SQLite] v. 3.11.2
* Import: (1) database from SQL file (2) table from CSV file
* Export: (1) database to SQL file (2) table(s) as CSV file (3) table(s) as JSON file
* Export the query result: ok. Steps (1) execute SQL (2) click "Save the results" as CSV file
 
''$'' [https://www.navicat.com/cht/products/navicat-premium Navicat Premium]
* Import: (1) database from SQL file (2) table from CSV/Excel file
* Export: (1) database to SQL file (2) table(s) as CSV/Excel file
* Export the query result: ok
 


== References ==
== References ==

Latest revision as of 07:42, 13 November 2019

Steps of migration database engine from MySQL to SQLite

Steps of migration database engine from MySQL to SQLite[edit]

  1. Migrate database data from MySQL to SQLite using the SQLite management software
  2. Modify the scripts of database connection and SQL query syntax because some MySQL functions are not compatible in SQLite
  3. Testing the scripts

Notes of modification of scripts[edit]

  • 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 ' or double quote symbol ". 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 MySQL CHAR_LENGTH function with SQLite Length function[1]
    • Replace MySQL IF function with SQLite CASE function[2]
    • Replace MySQL LOCATE function[3] with SQLite INSTR CASE function[4]
-- MySQL
LOCATE(substr,str), LOCATE(substr,str,pos)

-- SQLite
INSTR(string, substring);
  • Other functions are not supported such as: SET, Truncate[5], INGORE

References[edit]

  1. ↑ sqlite does not have CHAR_LENGTH function · Issue #47 · owncloudarchive/mozilla_sync
  2. ↑ SQLite CASE Expression: Simple CASE & Search CASE
  3. ↑ MySQL :: MySQL 8.0 Reference Manual :: 12.5 String Functions and Operators
  4. ↑ SQLite INSTR
  5. ↑ SQLite Truncate Table | 菜鸟教程
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