09-03-2009
Dynamic SQL for where clause
Hi,
I have an app which user can query the database based on 4 criteria, that is Field1, Field2, Field3 and Field4
Mya I know how to write a dynamic SQL where I can choose to retrieve data based on their selected value.
eg. where Field1=AAA
eg. where Field1=AAA and Field2=BBB
eg. where Field2=BBB and Field4=CCC, etc.
I have been trying to code:
mySQL="Select Field1, Field2, Field3, Field4 from table1 "
if [ $field1 != "All" ] ; then
myWhere=" where Field1='$field1' " ;
else
myWhere=" where Field1 like '%' " ;
fi
if [ $field2 != "All" ] ; then
myWhere= ${myWhere} || " minus " || ${mySQL} || ${myWhere} || " and Field2 <> '$field2' " ;
fi
if [ $field3 != "All" ] ; then
myWhere= ${myWhere} || " minus " || ${mySQL} || ${myWhere} || " and Field3 <> '$field3' " ;
fi
if [ $field4 != "All" ] ; then
myWhere= ${myWhere} || " minus " || ${mySQL} || ${myWhere} || " and Field4 <> '$field4' " ;
fi
mySQL=${mySQL} || ${myWhere} ;
sqlplus -S "$ORACCS" <<-__EOF__
${myWhere} ;
__EOF__
I am hitting syntax error while trying to compare Field2. Please advise how should I create a dynamic SQL. Thanks in advance.
Regards
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LEARN ABOUT DEBIAN
databaseintro
databaseintro(1grass) Grass User's Manual databaseintro(1grass)
Database management in GRASS GIS
Attribute management in general
GRASS can be linked to one or many database management systems (DBMS). The db.* set of commands provides basic SQL support for attribute
management, while the v.db.* set of commands operates on the vector map (see Vector introduction).
Available drivers
Available drivers are listed in SQL support in GRASS GIS.
Notes:
The default DBF driver provides only very limited SQL support (as DBF is not an SQL DB) while the other DBMS backends (such as PostgreSQL,
MySQL etc) provide full SQL support since the SQL commands are sent directly to the DBMS.
DB connection management
The current database management settings are shown or modified with db.connect for current mapset. Available DBMI drivers are listed with
db.drivers. Some DBMI backends require a user/password for driver/database to be set with db.login. In order to test a driver, run
db.test.
Attribute data import and export
Attribute data can be imported with db.in.ogr from various formats and exported with db.out.ogr. To internally copy a a full table or
selectively parts of it, use db.copy.
Further conversion tools:
MDB Tools: Convert MS-Access data to SQL, DBF, etc.
Openoffice.org with SQL Databases
SQL commands
GRASS supports to main SQL operations, execution of an SQL statement (db.execute) and selection of data from a table (db.select). See the
SQL help page for examples.
Managing the default DBMI settings
Per default vector map attributes are stored in DBF table files. This default definition can be modified with db.connect. If an external
DBMS is used, db.login may be required.
Creating a database
Specific commands are explained on the individual driver pages (these pages are only available if driver was compiled in this installa-
tion):
DBF: see DBF page
SQLite: SQLite page
mySQL: meSQL pages
ODBC: ODBC page (connect to Oracle, etc.)
PostgreSQL: PostgreSQL and PostGIS page
Metadata
All columns for a given table are listed with db.columns. The command db.describe describes a table in detail. To list all available
tables for a given database, run db.tables.
Table maintenance
To drop a column from a selected attribute table, use db.dropcol. With db.droptable an attribute table can be deleted.
Database Schema
Currently schema support only works for PostgreSQL connections. Default schema can be set with db.connect. Note that the default schema
will be used by all db.* modules.
db.tables returns 'schema.table' if schemas are available in the database.
Migrating to a different database engine
To migrate a GRASS database table (or a GRASS vector map) to a different DBMI engine, the best solution is to create a new MAPSET, define
the DBMI settings accordingly with db.login. Then the table of interest can be copied over with db.copy from the original MAPSET. Like-
wise, a vector map including its table(s) are copied from the original MAPSET to the current MAPSET with g.copy.
See also
Introduction to GRASS vector map processing
Introduction to GRASS raster map processing
Main index - database index - full index
(C) 2008-2011 GRASS Development Team
GRASS 6.4.2 databaseintro(1grass)