db.execute(1grass)

1db.execute(1)                 Grass User's Manual                db.execute(1)
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NAME

6       db.execute  - Executes any SQL statement.
7       For SELECT statements use ’db.select’.
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KEYWORDS

10       database, attribute table, SQL
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SYNOPSIS

13       db.execute
14       db.execute --help
15       db.execute   [-i]    [sql=sql_query]     [input=name]     [driver=name]
16       [database=name]    [schema=name]    [--help]   [--verbose]    [--quiet]
17       [--ui]
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19   Flags:
20       -i
21           Ignore SQL errors and continue
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23       --help
24           Print usage summary
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26       --verbose
27           Verbose module output
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29       --quiet
30           Quiet module output
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32       --ui
33           Force launching GUI dialog
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35   Parameters:
36       sql=sql_query
37           SQL statement
38           Example: update rybniky set kapri = ’hodne’ where kapri = ’malo’
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40       input=name
41           Name of file containing SQL statement(s)
42           ’-’ for standard input
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44       driver=name
45           Name of database driver
46           Options: dbf, mesql, mysql, odbc, ogr, pg, sqlite
47           Default: sqlite
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49       database=name
50           Name of database
51           Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db
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53       schema=name
54           Database schema
55           Do not use this option if schemas are not supported by driver/data‐
56           base server
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DESCRIPTION

59       db.execute allows the user to execute SQL statements.
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NOTES

62       db.execute only executes SQL statements and does not return  any  data.
63       If you need data returned from the database, use db.select.
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65       If  parameters for database connection are already set with db.connect,
66       they are taken as default values and do not need to be  specified  each
67       time.
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69       If  you have a large number of SQL commands to process, it is much much
70       faster to place all the SQL statements into a text file and  use  input
71       file  parameter  than it is to process each statement individually in a
72       loop. If multiple instruction lines are given, each SQL line  must  end
73       with a semicolon.
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75       Please  see  the individual GRASS SQL interface for how to create a new
76       database.
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EXAMPLES

79       Create a new table with columns ’cat’ and ’soiltype’:
80       db.execute sql="CREATE TABLE soils (cat integer, soiltype varchar(10))"
81       Create a new table using a file with SQL statements
82       db.execute driver=odbc database=grassdb input=file.sql
83       Insert new row into attribute table:
84       db.execute sql="INSERT INTO mysites (id,name,east,north) values (30,’Ala’,1657340,5072301)"
85       Update attribute entries to new value based on SQL rule:
86       db.execute sql="UPDATE roads SET travelcost=5 WHERE cat=1"
87       Update attribute entries to new value based on SQL rule:
88       db.execute sql="UPDATE dourokukan SET testc=50 WHERE testc is NULL"
89       Delete selected rows from attribute table:
90       db.execute sql="DELETE FROM gsod_stationlist WHERE latitude < -91"
91       Add new column to attribute table:
92       db.execute sql="ALTER TABLE roads ADD COLUMN length double"
93       Column type conversion - update new column from  existing  column  (all
94       drivers except for DBF):
95       # ’z_value’ is varchar and ’z’ is double precision:
96       echo "UPDATE geodetic_pts SET z = CAST(z_value AS numeric)" | db.execute input=-
97       Drop column from attribute table:
98       db.execute sql="ALTER TABLE roads DROP COLUMN length"
99       Drop table (not supported by all drivers):
100       db.execute sql="DROP TABLE fmacopy"
101       Update   attribute  with  multiple  SQL  instructions  in  file  (e.g.,
102       file.sql, instruction line must end with a semicolon):
103       UPDATE roads SET travelcost=5 WHERE cat=1;
104       UPDATE roads SET travelcost=2 WHERE cat=2;
105       db.execute input=file.sql
106       Join table ’myroads’ to table ’extratab’ based on common  ’cat’  column
107       values (not supported by DBF driver):
108       db.execute sql="UPDATE extratab SET names=(SELECT label FROM myroads WHERE extratab.cat=myroads.cat)"
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AUTHOR

117       CERL
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119       Last changed: $Date: 2014-11-28 10:57:47 +0100 (Fri, 28 Nov 2014) $
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SOURCE CODE

122       Available at: db.execute source code (history)
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124       Main index | Database index | Topics index | Keywords index | Graphical
125       index | Full index
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127       © 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual
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131GRASS 7.6.0                                                      db.execute(1)