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 @ 44376
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1 | 43020 | jjdelcerro | package org.gvsig.fmap.dal.store.jdbc2.spi.operations; |
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2 | |||
3 | import java.sql.Connection; |
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4 | import java.sql.ResultSet; |
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5 | import java.sql.SQLException; |
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6 | import java.sql.Statement; |
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7 | import org.apache.commons.lang3.StringUtils; |
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8 | 44198 | jjdelcerro | import org.gvsig.expressionevaluator.ExpressionBuilder; |
9 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.exception.DataException; |
10 | 44376 | jjdelcerro | import org.gvsig.fmap.dal.feature.FeatureType; |
11 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
12 | import org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase; |
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13 | import org.gvsig.fmap.dal.store.jdbc.exception.JDBCSQLException; |
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14 | import org.gvsig.fmap.dal.store.jdbc2.JDBCUtils; |
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15 | 44058 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc2.OperationsFactory.TableReference; |
16 | 44198 | jjdelcerro | import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_FEATURE_TYPE; |
17 | import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_TABLE; |
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18 | 43020 | jjdelcerro | |
19 | public class TableIsEmptyOperation extends AbstractConnectionOperation { |
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20 | |||
21 | 44058 | jjdelcerro | private final TableReference table; |
22 | 43020 | jjdelcerro | private final String baseFilter; |
23 | private final String filter; |
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24 | 44376 | jjdelcerro | private final FeatureType featureType; |
25 | 43020 | jjdelcerro | |
26 | public TableIsEmptyOperation(
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27 | JDBCHelper helper |
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28 | ) { |
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29 | 44376 | jjdelcerro | this(helper, null, null, null, null); |
30 | 43020 | jjdelcerro | } |
31 | |||
32 | public TableIsEmptyOperation(
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33 | JDBCHelper helper, |
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34 | 44376 | jjdelcerro | FeatureType featureType, |
35 | 44058 | jjdelcerro | TableReference table, |
36 | 43020 | jjdelcerro | String baseFilter,
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37 | String filter
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38 | ) { |
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39 | super(helper);
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40 | 44376 | jjdelcerro | this.featureType = featureType;
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41 | 44058 | jjdelcerro | this.table = table;
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42 | 43020 | jjdelcerro | this.baseFilter = baseFilter;
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43 | this.filter = filter;
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44 | } |
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45 | |||
46 | @Override
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47 | public final Object perform(Connection conn) throws DataException { |
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48 | 44376 | jjdelcerro | return this.tableIsEmpty(conn, featureType, table, baseFilter, filter); |
49 | 43020 | jjdelcerro | } |
50 | |||
51 | public boolean tableIsEmpty(Connection conn, |
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52 | 44376 | jjdelcerro | FeatureType featureType, |
53 | 44058 | jjdelcerro | TableReference table, |
54 | 43020 | jjdelcerro | String baseFilter,
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55 | 44058 | jjdelcerro | String filter
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56 | ) throws DataException {
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57 | 43020 | jjdelcerro | |
58 | JDBCSQLBuilderBase sqlbuilder = this.createSQLBuilder();
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59 | 44198 | jjdelcerro | ExpressionBuilder expbuilder = sqlbuilder.expression(); |
60 | |||
61 | 43020 | jjdelcerro | sqlbuilder.select().column().all(); |
62 | 44058 | jjdelcerro | sqlbuilder.select().from().table() |
63 | .database(this.table.getDatabase())
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64 | .schema(this.table.getSchema())
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65 | .name(this.table.getTable());
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66 | sqlbuilder.select().from().subquery(this.table.getSubquery());
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67 | 43020 | jjdelcerro | if (!StringUtils.isEmpty(baseFilter)) {
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68 | 44198 | jjdelcerro | sqlbuilder.select().where().set( expbuilder.custom(baseFilter) ); |
69 | 43020 | jjdelcerro | } |
70 | if (!StringUtils.isEmpty(filter)) {
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71 | // El and() hace un set() si no hay un filtro previo
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72 | 44202 | jjdelcerro | sqlbuilder.select().where().and(expbuilder.toValue(filter)); |
73 | 43020 | jjdelcerro | } |
74 | sqlbuilder.select().limit(1);
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75 | 44376 | jjdelcerro | this.helper.replaceForeingValueFunction(sqlbuilder, featureType);
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76 | 44198 | jjdelcerro | sqlbuilder.setProperties( |
77 | ExpressionBuilder.Variable.class, |
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78 | PROP_TABLE, table |
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79 | ); |
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80 | 43020 | jjdelcerro | String sql = sqlbuilder.select().toString();
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81 | |||
82 | Statement st = null; |
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83 | ResultSet rs = null; |
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84 | try {
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85 | st = conn.createStatement(); |
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86 | rs = JDBCUtils.executeQuery(st, sql); |
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87 | return !rs.next();
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88 | |||
89 | } catch (SQLException ex) { |
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90 | throw new JDBCSQLException(ex); |
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91 | } finally {
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92 | JDBCUtils.closeQuietly(st); |
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93 | JDBCUtils.closeQuietly(rs); |
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94 | } |
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95 | } |
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96 | |||
97 | } |