db.executegrass - Online in the Cloud

PROGRAM:

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: mysql, odbc, sqlite, pg, ogr, dbf
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

DESCRIPTION

db.execute allows the user to execute SQL statements.

NOTES

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 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.

EXAMPLES

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)"

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