NAME
db.execute - Executes any SQL statement.
For SELECT statements use 'db.select'.
KEYWORDS
database,
attribute table,
SQL
SYNOPSIS
db.execute
db.execute --help
db.execute [-i] [sql=sql_query] [input=name] [driver=name] [database=name] [schema=name] [--help] [--verbose] [--quiet] [--ui]
Flags:
- -i
- Ignore SQL errors and continue
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- sql=sql_query
- SQL statement
- Example: update rybniky set kapri = 'hodne' where kapri = 'malo'
- input=name
- Name of file containing SQL statement(s)
- '-' for standard input
- driver=name
- Name of database driver
- Options: dbf, odbc, ogr, pg, sqlite
- Default: sqlite
- database=name
- Name of database
- Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db
- schema=name
- Database schema
- Do not use this option if schemas are not supported by driver/database server
db.execute allows the user to execute SQL statements.
db.execute only executes SQL statements and does not return
any data. If you need data returned from the database, use
db.select.
If parameters for database connection are already set with
db.connect, they are taken as default
values and do not need to be specified each time.
If you have a large number of SQL commands to process, it is much
faster to place all the SQL statements into a text file and
use input file parameter than it is to process each statement
individually in a loop. If multiple instruction lines are given, each
SQL line must end with a semicolon.
Please see the individual GRASS SQL interface
for how to create a new database.
Create a new table with columns 'cat' and 'soiltype':
db.execute sql="CREATE TABLE soils (cat integer, soiltype varchar(10))"
Create a new table using a file with SQL statements
db.execute driver=odbc database=grassdb input=file.sql
Insert new row into attribute table:
db.execute sql="INSERT INTO mysites (id,name,east,north) values (30,'Ala',1657340,5072301)"
Update attribute entries to new value based on SQL rule:
db.execute sql="UPDATE roads SET travelcost=5 WHERE cat=1"
Update attribute entries to new value based on SQL rule:
db.execute sql="UPDATE dourokukan SET testc=50 WHERE testc is NULL"
Delete selected rows from attribute table:
db.execute sql="DELETE FROM gsod_stationlist WHERE latitude < -91"
Add new column to attribute table:
db.execute sql="ALTER TABLE roads ADD COLUMN length double"
Column type conversion - update new column from existing column (all
drivers except for DBF):
# 'z_value' is varchar and 'z' is double precision:
echo "UPDATE geodetic_pts SET z = CAST(z_value AS numeric)" | db.execute input=-
Drop column from attribute table:
db.execute sql="ALTER TABLE roads DROP COLUMN length"
Drop table (not supported by all drivers):
db.execute sql="DROP TABLE fmacopy"
Update attribute with multiple SQL instructions in file
(e.g.,
file.sql, instruction line must end with a semicolon):
UPDATE roads SET travelcost=5 WHERE cat=1;
UPDATE roads SET travelcost=2 WHERE cat=2;
db.execute input=file.sql
Join table 'myroads' to table 'extratab' based on common 'cat' column
values (not supported by DBF driver):
db.execute sql="UPDATE extratab SET names=(SELECT label FROM myroads WHERE extratab.cat=myroads.cat)"
db.columns,
db.describe,
db.drivers,
db.droptable,
db.login,
db.select,
db.tables,
GRASS SQL interface
CERL
SOURCE CODE
Available at:
db.execute source code
(history)
Latest change: Monday Jan 22 17:14:14 2024 in commit: cfc987854f21a84ccfc8b65b2716922e5d8dc0eb
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© 2003-2024
GRASS Development Team,
GRASS GIS 8.5.0dev Reference Manual