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 / TableIsEmptyOperation.java @ 46518
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2020 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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package org.gvsig.fmap.dal.store.jdbc2.spi.operations; |
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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.gvsig.expressionevaluator.ExpressionBuilder; |
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import org.gvsig.fmap.dal.SQLBuilder; |
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import static org.gvsig.fmap.dal.SQLBuilder.PROP_TABLENAME; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.FeatureQuery; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
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import org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase; |
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import org.gvsig.fmap.dal.store.jdbc.exception.JDBCSQLException; |
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import org.gvsig.fmap.dal.store.jdbc2.JDBCConnection; |
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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 static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_FEATURE_TYPE; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_JDBCHELPER; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_QUERY; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_SYMBOLTABLE; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_TABLE; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.operations.ResultSetForSetProviderOperation.getAllExtraColumns; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.operations.ResultSetForSetProviderOperation.process3_Where; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.operations.ResultSetForSetProviderOperation.process4_Aggregates; |
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import static org.gvsig.fmap.dal.store.jdbc2.spi.operations.ResultSetForSetProviderOperation.process5_GroupBys; |
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import org.gvsig.tools.evaluator.Evaluator; |
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public class TableIsEmptyOperation extends AbstractConnectionOperation { |
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private final TableReference table; |
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private final String baseFilter; |
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private final FeatureQuery query; |
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private final FeatureType featureType; |
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public TableIsEmptyOperation(
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JDBCHelper helper |
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) { |
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this(helper, null, null, null, null); |
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} |
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public TableIsEmptyOperation(
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JDBCHelper helper, |
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FeatureType featureType, |
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TableReference table, |
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String baseFilter,
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FeatureQuery query |
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) { |
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super(helper);
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this.featureType = featureType;
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this.table = table;
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this.baseFilter = baseFilter;
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this.query = query;
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} |
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@Override
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public final Object perform(JDBCConnection conn) throws DataException { |
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return this.tableIsEmpty(conn); |
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} |
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public String getSQL() { |
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JDBCSQLBuilderBase sqlbuilder = this.createSQLBuilder();
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ExpressionBuilder expbuilder = sqlbuilder.expression(); |
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expbuilder.setProperty(PROP_FEATURE_TYPE, this.featureType);
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expbuilder.setProperty(PROP_TABLE, table); |
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expbuilder.setProperty(PROP_TABLENAME, table.getTable()); |
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expbuilder.setProperty(PROP_SYMBOLTABLE, this.query==null? null:this.query.getSymbolTable()); |
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expbuilder.setProperty(PROP_JDBCHELPER, this.helper);
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expbuilder.setProperty(PROP_QUERY, this.query);
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SQLBuilder.SelectBuilder select = sqlbuilder.select(); |
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// select.column().all();
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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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select.from().subquery(this.table.getSubquery());
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// ResultSetForSetProviderOperation.process2_ComputedFields(helper, featureType, query, sqlbuilder, select, null);
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process3_Where(helper, featureType, query, sqlbuilder, select); |
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if (!StringUtils.isEmpty(baseFilter)) {
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select.where().set( expbuilder.custom(baseFilter) ); |
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} |
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if (this.query != null && (query.hasAggregateFunctions() || query.hasGroupByColumns())) { |
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process4_Aggregates(this.table, this.featureType, this.query, getAllExtraColumns(this.featureType, this.query), sqlbuilder, select, null); |
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process5_GroupBys(this.table, this.featureType, this.query, getAllExtraColumns(this.featureType, this.query), sqlbuilder, select, null); |
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} |
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sqlbuilder.select().limit(1);
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sqlbuilder.setProperties( |
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null,
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PROP_FEATURE_TYPE, this.featureType,
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PROP_TABLE, table, |
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PROP_SYMBOLTABLE, this.query==null? null:this.query.getSymbolTable(), |
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PROP_JDBCHELPER, this.helper,
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PROP_QUERY, this.query
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); |
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this.helper.expandCalculedColumns(sqlbuilder);
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this.helper.processSpecialFunctions(sqlbuilder, featureType, null); |
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if(select.getColumns().isEmpty()){
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select.column().value(expbuilder.constant(1));
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} |
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String sql = sqlbuilder.select().toString();
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return sql;
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} |
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public boolean tableIsEmpty(JDBCConnection conn) throws DataException { |
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String sql = this.getSQL(); |
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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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return !rs.next();
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} catch (SQLException ex) { |
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throw new JDBCSQLException(ex,sql); |
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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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} |