svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.db / org.gvsig.fmap.dal.db.jdbc / src / main / java / org / gvsig / fmap / dal / store / jdbc2 / spi / operations / CalculateEnvelopeOfColumnOperation.java @ 44349
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package org.gvsig.fmap.dal.store.jdbc2.spi.operations; |
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import java.sql.Connection; |
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import java.sql.ResultSet; |
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import java.sql.SQLException; |
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import java.sql.Statement; |
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import org.apache.commons.lang3.StringUtils; |
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import org.cresques.cts.IProjection; |
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import org.gvsig.expressionevaluator.ExpressionBuilder; |
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import org.gvsig.expressionevaluator.ExpressionBuilder.Variable; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.store.jdbc.exception.JDBCSQLException; |
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import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
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import org.gvsig.fmap.dal.store.jdbc2.JDBCUtils; |
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import org.gvsig.fmap.dal.store.jdbc2.OperationsFactory.TableReference; |
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import org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_TABLE; |
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import org.gvsig.fmap.geom.Geometry; |
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import org.gvsig.fmap.geom.primitive.Envelope; |
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public class CalculateEnvelopeOfColumnOperation extends AbstractConnectionOperation { |
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private final TableReference table; |
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private final String columnName; |
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private final String baseFilter; |
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private final Envelope limit; |
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private final IProjection crs; |
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public CalculateEnvelopeOfColumnOperation(
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JDBCHelper helper, |
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TableReference table, |
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String columnName,
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String baseFilter,
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Envelope limit, |
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IProjection crs |
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) { |
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super(helper);
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this.table = table;
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this.columnName = columnName;
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this.baseFilter = baseFilter;
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this.limit = limit;
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this.crs = crs;
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} |
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@Override
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public final Object perform(Connection conn) throws DataException { |
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Envelope env = calculateEnvelopeOfColumn( |
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conn, |
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table, |
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columnName, |
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baseFilter, |
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limit, |
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crs |
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); |
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return env;
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} |
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public Envelope calculateEnvelopeOfColumn(
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Connection conn,
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TableReference table, |
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String columnName,
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String baseFilter,
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Envelope limit, |
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IProjection crs |
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) throws DataException {
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//
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// Parece ser que en versiones anteriores a SQL Server 2012 no esta
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// disponible la funcion ST_ExtentAggregate.
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// Habria que determinar si es necesario implementar una alternativa
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// para estos casos.
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//
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// https://alastaira.wordpress.com/2011/07/26/determining-the-geographic-extent-of-spatial-features-in-a-sql-server-table/
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//
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JDBCSQLBuilderBase sqlbuilder = this.createSQLBuilder();
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ExpressionBuilder expbuilder = sqlbuilder.expression(); |
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sqlbuilder.select().column().value( |
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expbuilder.ifnull( |
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expbuilder.column(columnName), |
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expbuilder.constant(null),
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expbuilder.as_geometry( |
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expbuilder.ST_ExtentAggregate( |
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expbuilder.column(columnName) |
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) |
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) |
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) |
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); |
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sqlbuilder.select().group_by(expbuilder.column(columnName)); |
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sqlbuilder.select().from().table() |
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.database(this.table.getDatabase())
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.schema(this.table.getSchema())
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.name(this.table.getTable());
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sqlbuilder.select().from().subquery(this.table.getSubquery());
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if (StringUtils.isEmpty(baseFilter)) {
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if (limit != null) { |
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sqlbuilder.select().where().set( |
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expbuilder.ST_Intersects( |
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expbuilder.ST_Envelope( |
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expbuilder.column(columnName) |
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), |
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expbuilder.ST_Envelope( |
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expbuilder.geometry(limit.getGeometry(), crs) |
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) |
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) |
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); |
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} |
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} else {
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sqlbuilder.select().where().set( expbuilder.custom(baseFilter) ); |
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if (limit != null) { |
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sqlbuilder.select().where().and( |
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expbuilder.ST_Intersects( |
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expbuilder.ST_Envelope( |
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expbuilder.column(columnName) |
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), |
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expbuilder.ST_Envelope( |
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expbuilder.geometry(limit.getGeometry(), crs) |
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) |
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) |
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); |
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} |
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} |
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sqlbuilder.setProperties( |
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Variable.class, |
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PROP_TABLE, table |
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); |
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String sql = sqlbuilder.select().toString();
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Statement st = null; |
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ResultSet rs = null; |
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try {
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st = conn.createStatement(); |
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rs = JDBCUtils.executeQuery(st, sql); |
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if (!rs.next()) {
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return null; |
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} |
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Geometry geom = this.helper.getGeometryFromColumn(rs, 1); |
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if (geom == null) { |
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return null; |
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} |
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return geom.getEnvelope();
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} catch (SQLException ex) { |
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throw new JDBCSQLException(ex); |
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} finally {
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JDBCUtils.closeQuietly(st); |
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JDBCUtils.closeQuietly(rs); |
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} |
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} |
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} |