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 / FetchFeatureProviderByReferenceOperation.java @ 43020
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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.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.fmap.dal.feature.spi.FeatureProvider; |
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import org.gvsig.fmap.dal.feature.spi.FeatureReferenceProviderServices; |
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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.spi.JDBCSQLBuilderBase; |
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public class FetchFeatureProviderByReferenceOperation extends AbstractConnectionOperation { |
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private final FeatureType featureType; |
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private final FeatureReferenceProviderServices reference; |
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private final String schema; |
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private final String table; |
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private final String database; |
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public FetchFeatureProviderByReferenceOperation(
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JDBCHelper helper, |
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FeatureReferenceProviderServices reference, |
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FeatureType featureType, |
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String database,
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String schema,
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String table
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) { |
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super(helper);
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this.reference = reference;
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this.database = database;
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this.schema = schema;
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this.table = table;
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this.featureType = featureType;
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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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FeatureProvider feature = fetchFeatureProviderByReference( |
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conn, |
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reference, |
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featureType, |
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database, |
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schema, |
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table |
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); |
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return feature;
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} |
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public FeatureProvider fetchFeatureProviderByReference(
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Connection conn,
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FeatureReferenceProviderServices reference, |
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// FeatureType storeType,
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FeatureType featureType, |
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String database,
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String schema,
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String table
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) throws DataException {
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// FeatureAttributeDescriptor[] primaryKey = storeType.getPrimaryKey();
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String[] primaryKeys = reference.getKeyNames(); |
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JDBCSQLBuilderBase sqlbuilder = this.createSQLBuilder();
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for (FeatureAttributeDescriptor attr : featureType) {
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sqlbuilder.select().column().name(attr.getName()); |
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} |
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sqlbuilder.select().from().table().database(database).schema(schema).name(table); |
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for (String name : primaryKeys ) { |
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if( !sqlbuilder.select().has_column(name) ) {
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sqlbuilder.select().column().name(name); |
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} |
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Object value = reference.getKeyValue(name);
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if( value == null ) { |
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sqlbuilder.select().where().and( |
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sqlbuilder.isNull(sqlbuilder.column(name)) |
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); |
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} else {
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sqlbuilder.select().where().and( |
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sqlbuilder.eq( |
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sqlbuilder.column(name), |
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sqlbuilder.parameter(name).as_variable() |
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) |
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); |
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} |
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} |
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sqlbuilder.select().limit(1);
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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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FeatureProvider data = this.helper.createFeature(featureType);
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this.helper.fetchFeature(data, rs);
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return data;
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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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} |