org.h2gis.functions.spatial.properties

Class ColumnSRID

java.lang.Object

org.h2gis.api.AbstractFunction

org.h2gis.functions.spatial.properties.ColumnSRID

All Implemented Interfaces:

org.h2gis.api.Function, org.h2gis.api.ScalarFunction

public class ColumnSRID
extends org.h2gis.api.AbstractFunction
implements org.h2gis.api.ScalarFunction

Get the column SRID from constraints and data.

Author:

Nicolas Fortin

Field Summary

Fields inherited from interface org.h2gis.api.ScalarFunction

PROP_DETERMINISTIC, PROP_NOBUFFER

Fields inherited from interface org.h2gis.api.Function

PROP_NAME, PROP_REMARKS

Constructor Summary

Constructors

Constructor and Description
ColumnSRID()

Method Summary

Modifier and Type	Method and Description
static String	fetchConstraint(Connection connection, String catalogName, String schemaName, String tableName) Read table constraints from database metadata.
String	getJavaStaticMethod()
static int	getSRID(Connection connection, String catalogName, String schemaName, String tableName, String columnName, String constraint)
static int	getSRIDFromConstraint(String constraint, String columnName)

Methods inherited from class org.h2gis.api.AbstractFunction

addProperty, getProperty, removeProperty

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.h2gis.api.Function

getProperty

Constructor Detail

ColumnSRID

public ColumnSRID()

Method Detail

getJavaStaticMethod

public String getJavaStaticMethod()

Specified by:

getJavaStaticMethod in interface org.h2gis.api.ScalarFunction

getSRIDFromConstraint

public static int getSRIDFromConstraint(String constraint,
                                        String columnName)

Parameters:

constraint - Constraint expression ex:"ST_SRID(the_geom) = 27572"

Returns:

The SRID or 0 if no constraint are found or constraint on other column

fetchConstraint

public static String fetchConstraint(Connection connection,
                                     String catalogName,
                                     String schemaName,
                                     String tableName)
                              throws SQLException

Read table constraints from database metadata.

Parameters:

connection - Active connection

catalogName - Catalog name or empty string

schemaName - Schema name or empty string

tableName - table name

Returns:

Found table constraints

Throws:

SQLException

getSRID

public static int getSRID(Connection connection,
                          String catalogName,
                          String schemaName,
                          String tableName,
                          String columnName,
                          String constraint)

Parameters:

connection - Active connection

tableName - Target table name

columnName - Spatial field name

constraint - Column constraint

Returns:

The column SRID from constraints and data.