![]() Explanatory text has a maximum length of 255 characters. ![]() In GAMS set elements have a maximum length of 63 characters. String columns will have the type VARCHAR(255) instead of TEXT.Īn example of explanatory text is: Set cty / AFG 'Afghanistan' Using both -small -fast will write the data most efficiently. Try to speed up writing the data using some non-standard pragmas. A user-friendly SQL VIEW is created to hide the complexities of the joins. We will not allow adding data to existing tables. This will allow adding new symbols in new tables. This optional flag will export explanatory text for set elements.ĭon't delete the database file before processing. This is an optional flag that will cause gdx2sqlite to print additional debugging information. The following options are available: Options 'GDX2SQLITE' is a command line tool that is best called from within a GAMS program using the $call or Execute statement, e.g.: execute_unload "results.gdx", yield, price Įxecute "gdx2sqlite -i results.gdx -o results.db" In summary: SQLite is a useful export format for GAMS solution data sets. Many programs support reading SQLite database files, either through a native database access driver or via a standard ODBC interface. Another useful format is CSV files, but typically several CSV files are needed to store a data set stored in a GDX file. For some large data sets this size limit present in MS Access and DBF database files causes problems. The main advantages of using SQLite over other single file database systems such as MS Access is that SQLite is free and in the public domain and that it does not impose a 2 GB file size limit. GDX2SQLITE.EXE is a tool to dump the complete contents of a GAMS GDX file (see GAMS Data eXchange (GDX)) into a SQLite database file (the website contains a wealth of information on SQLite).Ī SQLite database is stored in a single file so it can be easily e-mailed or otherwise transmitted. Please use Connect agent SQLWriter instead. Author Erwin Kalvelagen Date NovemAttention GDX2SQLITE is deprecated (see GAMS 40 GDX2SQLITE release notes). If you are already familiar with SQL, you will notice the differences between SQL standard and the SQL dialect used in SQLite.A Tool to dump GDX contents into SQLite database file. You will first start querying data from the sample database. This section presents basic SQL statements that you can use with SQLite.
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