1grass-mesql(1)              GRASS GIS User's Manual             grass-mesql(1)
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5MySQL embedded driver in GRASS
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KEYWORDS

8       database, attribute table, driver
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DESCRIPTION

11       MySQL database driver in GRASS enables GRASS to store vector attributes
12       in MySQL embedded database without necessity to run MySQL server.
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Driver and database name

15       GRASS modules require 2 parameters to connect to a database.  Those pa‐
16       rameters are ’driver’ and ’database’. For MySQL embedded driver the pa‐
17       rameter ’driver’ should be set to value ’mesql’.  The parameter  ’data‐
18       base’ is a full path to the directory where database tables are stored.
19       The best place is a directory in the mapset. The directory must be cre‐
20       ated  before  use of the driver. In the name of database it is possible
21       to use 3 variables:
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23           •   $GISDBASE - path to current GISBASE
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25           •   $LOCATION_NAME - name of current location
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27           •   $MAPSET - name of current mapset
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29       Examples of connection parameters:
30       db.connect driver=mesql database=’$GISDBASE/$LOCATION_NAME/$MAPSET/mysql’
31       db.connect driver=mesql database=/home/user1/db
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Data types, indexes

34       For more information about supported data types  and  indexes  see  the
35       documentation for MySQL (mysql) driver.
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Database type

38       Because  database  closing  was found very slow if InnoDB was used, the
39       InnoDB storage is disabled by default (hardcoded ’--skip-innodb’ server
40       option).
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Note

43       The  embedded  server is started with hardcoded ’--bootstrap’ option to
44       avoid warning about missing "mysql.time_zone_leap_second  table".  This
45       can be fixed in future.
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Troubleshooting: SQL syntax error

48       Attempting  to use a reserved SQL word as column or table name will re‐
49       sult in a "SQL syntax" error. The list of reserved words for MySQL  can
50       be found in the MySQL manual.
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SEE ALSO

53        db.connect, SQL support in GRASS GIS
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AUTHOR

56       Radim Blazek
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58       Credits: Development of the driver was sponsored by Faunalia (Italy) as
59       part of a project for ATAC.
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61       Main index - Database index - Topics index - Keywords Index - Full  in‐
62       dex
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64       © 2003-2022 GRASS Development Team, GRASS GIS 8 Reference Manual
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68GRASS 8.2.1                                                     grass-mesql(1)
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