grass-mesql(1grass)

1grass-mesql(1)                Grass 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
16       parameters  are  ’driver’ and ’database’. For MySQL embedded driver the
17       parameter ’driver’ should be  set  to  value  ’mesql’.   The  parameter
18       ’database’  is  a  full path to the directory where database tables are
19       stored. The best place is a directory in the mapset. The directory must
20       be created before use of the driver. In the name of database it is pos‐
21       sible 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
49       result in a "SQL syntax" error. The list of reserved  words  for  MySQL
50       can be found in the MySQL manual.
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Credits

56       Development  of the driver was sponsored by Faunalia (Italy) as part of
57       a project for ATAC.
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AUTHOR

60       Radim Blazek
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62       Last changed: $Date: 2014-04-20 12:09:22 +0200 (Sun, 20 Apr 2014) $
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64       Main index - Database index - Topics index  -  Keywords  Index  -  Full
65       index
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67       © 2003-2013 GRASS Development Team, GRASS GIS 7.0.svn Reference Manual
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71GRASS 7.4.4                                                     grass-mesql(1)