Kexi/Migration: Difference between revisions

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Data Migration And Sharing.
==Add support for appending CSV data to an existing table==
*Status: TODO
*{{wish|305505}}


===Rationale===
{{Note|TODO: Move content from [http://kexi-project.org/wiki/wikiview/[email protected]]}}
Appending CSV data to an existing table gives a simple means for merging CSV data chunks in one step.


===Assumptions & Requirements===
*[[/General/]]
*The data should be appended to the existing table, without changes made to the
*[[Kexi/Junior_Jobs#Migration|Junior Jobs]]
*Data is in largely the same format (regarding column or data types) as the data used to create the original table, to achieve this:
**Data types for columns should be taken from the schema of the destination table
**Column names stay untouched in the destination table, however autodetection should be still used to figure out value of the "First row contains column names" option; the option can be changed in the


*Conflicts resolutions:
==File formats==
**Data type violations (for example when importing string when numeric value is expected): TODO - for 2.6 we need to have friendly error message at least
*[[/CSV/]]
***Future: propose skipping conflicting values
*[[/MDB/]]
**Primary key violations: TODO - for 2.6 we need to have friendly error message at least
*[[/ODB/]]
***Future: propose skipping records with conflicting values or replacing the old records with new ones
*[[/Spreadsheet/]]
**Future: unique key violations: TODO
*[[/SQLite/]]
*[[/Fixed Width Text/]]


===GUI Design===
==Servers==
Existing GUI is based on single dialog as follows:<br/>
*[[/MySQL/]]
[[Image:Kexi CSV Import Dialog.png|500px]]
*[[/PostgreSQL/]]
 
Switching to KAssistantDialog is needed.
Proposed pages:
1. File selection (implementation already exists but uses separate modal dialog)
 
2. Data preview and options (implementation already exists but uses separate modal dialog)
 
3. Destination Selection page:
*[KexiCommandLinkButton 3.1]: Import data into a new table
*[KexiCommandLinkButton 3.2]: Append data to existing table
 
4.1. (when 3.1 clicked) Save Object As (implementation already exists but uses separate modal dialog)
 
4.2. (when 3.2 clicked) Select destination table
*use KexiFieldListView for the list of tables
*double click on name should do the same as clicking Next button
 
5. Importing
*display progress bar
*while importing disable all buttons but cancel
*hide the progress when done with importing and display "Data has been successfully imported to table "%1" (implementation already exists but uses separate modal dialog)
*available buttons should be: "Open..." and "Close"; "Cancel" should not be displayed after importing (implementation already exists but uses separate modal dialog)
 
==Porting to non-modal assistants==
*Status: TODO
 
'''What is involved in porting to the new gui?''' <jstaniek>: We sit and design the given assistant and I am helping with using the API and possibly extending/fixing it. The difference is that many imports can be started concurrently so some extra checking may be needed but this is a side note. Also e.g. user could try to edit/remove a source table during export. So this is fun. But after the change the GUI would be a lot more natural I think.
 
==Migration from file-based project to a MySQL database project==
This is sqlite3 to mysql conversion using python script sqlite3-to-mysql.py, see also this [http://www.redmine.org/boards/2/topics/12793 thread].
 
Steps for importing mydb project from file into a MySQL db server:
 
1. Execute:
% sqlite3 mydb.kexi .dump > mydb.sql
2. Download [[/sqlite3-to-mysql.py/]] and run:
% ./sqlite3-to-mysql.py mydb.sql > mydb.mysql
3. Create empty MySQL database
% mysqladmin -p -u ..... create mydb
4. Finally, import
% mysql -p -u ..... mydb < mydb.mysql
 
Notes:
*This tool can fail if large photos where stored in the database.
*This tool is pretty slow.
*Final solution will be just one click away in Kexi.
 
==Primary Key Matters==
*Status: IN PROGRESS
 
This section lists matters and solutions needed while importing new or existing primary key is encountered in the destination table.

Latest revision as of 21:47, 12 October 2014

Data Migration And Sharing.

Note

TODO: Move content from [1]


File formats

Servers