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 @ 44198
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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 | import org.cresques.cts.IProjection; |
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9 | 44198 | jjdelcerro | import org.gvsig.expressionevaluator.ExpressionBuilder; |
10 | import org.gvsig.expressionevaluator.ExpressionBuilder.Variable; |
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11 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.exception.DataException; |
12 | import org.gvsig.fmap.dal.store.jdbc.exception.JDBCSQLException; |
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13 | import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
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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 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase; |
17 | 44198 | jjdelcerro | import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_TABLE; |
18 | 43020 | jjdelcerro | import org.gvsig.fmap.geom.Geometry; |
19 | import org.gvsig.fmap.geom.primitive.Envelope; |
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20 | |||
21 | public class CalculateEnvelopeOfColumnOperation extends AbstractConnectionOperation { |
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22 | |||
23 | 44058 | jjdelcerro | private final TableReference table; |
24 | 43020 | jjdelcerro | private final String columnName; |
25 | private final String baseFilter; |
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26 | private final Envelope limit; |
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27 | private final IProjection crs; |
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28 | |||
29 | public CalculateEnvelopeOfColumnOperation(
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30 | JDBCHelper helper, |
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31 | 44058 | jjdelcerro | TableReference table, |
32 | 43020 | jjdelcerro | String columnName,
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33 | String baseFilter,
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34 | Envelope limit, |
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35 | IProjection crs |
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36 | ) { |
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37 | super(helper);
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38 | 44058 | jjdelcerro | this.table = table;
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39 | 43020 | jjdelcerro | this.columnName = columnName;
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40 | this.baseFilter = baseFilter;
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41 | this.limit = limit;
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42 | this.crs = crs;
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43 | } |
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44 | |||
45 | @Override
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46 | public final Object perform(Connection conn) throws DataException { |
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47 | Envelope env = calculateEnvelopeOfColumn( |
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48 | conn, |
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49 | 44058 | jjdelcerro | table, |
50 | 43020 | jjdelcerro | columnName, |
51 | baseFilter, |
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52 | limit, |
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53 | crs |
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54 | ); |
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55 | return env;
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56 | } |
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57 | |||
58 | public Envelope calculateEnvelopeOfColumn(
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59 | Connection conn,
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60 | 44058 | jjdelcerro | TableReference table, |
61 | 43020 | jjdelcerro | String columnName,
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62 | String baseFilter,
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63 | Envelope limit, |
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64 | IProjection crs |
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65 | ) throws DataException {
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66 | |||
67 | 43088 | jjdelcerro | //
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68 | // Parece ser que en versiones anteriores a SQL Server 2012 no esta
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69 | // disponible la funcion ST_ExtentAggregate.
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70 | // Habria que determinar si es necesario implementar una alternativa
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71 | // para estos casos.
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72 | //
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73 | // https://alastaira.wordpress.com/2011/07/26/determining-the-geographic-extent-of-spatial-features-in-a-sql-server-table/
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74 | //
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75 | 43020 | jjdelcerro | JDBCSQLBuilderBase sqlbuilder = this.createSQLBuilder();
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76 | 44198 | jjdelcerro | ExpressionBuilder expbuilder = sqlbuilder.expression(); |
77 | |||
78 | 43020 | jjdelcerro | sqlbuilder.select().column().value( |
79 | 44198 | jjdelcerro | expbuilder.as_geometry( |
80 | expbuilder.ST_ExtentAggregate( |
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81 | expbuilder.column(columnName) |
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82 | 43020 | jjdelcerro | ) |
83 | ) |
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84 | ); |
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85 | |||
86 | 44058 | jjdelcerro | sqlbuilder.select().from().table() |
87 | .database(this.table.getDatabase())
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88 | .schema(this.table.getSchema())
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89 | .name(this.table.getTable());
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90 | sqlbuilder.select().from().subquery(this.table.getSubquery());
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91 | 43020 | jjdelcerro | |
92 | if (StringUtils.isEmpty(baseFilter)) {
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93 | if (limit != null) { |
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94 | sqlbuilder.select().where().set( |
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95 | 44198 | jjdelcerro | expbuilder.ST_Intersects( |
96 | expbuilder.ST_Envelope( |
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97 | expbuilder.column(columnName) |
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98 | 43020 | jjdelcerro | ), |
99 | 44198 | jjdelcerro | expbuilder.ST_Envelope( |
100 | expbuilder.geometry(limit.getGeometry(), crs) |
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101 | 43020 | jjdelcerro | ) |
102 | ) |
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103 | ); |
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104 | } |
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105 | } else {
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106 | 44198 | jjdelcerro | sqlbuilder.select().where().set( expbuilder.custom(baseFilter) ); |
107 | 43020 | jjdelcerro | if (limit != null) { |
108 | sqlbuilder.select().where().and( |
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109 | 44198 | jjdelcerro | expbuilder.ST_Intersects( |
110 | expbuilder.ST_Envelope( |
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111 | expbuilder.column(columnName) |
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112 | 43020 | jjdelcerro | ), |
113 | 44198 | jjdelcerro | expbuilder.ST_Envelope( |
114 | expbuilder.geometry(limit.getGeometry(), crs) |
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115 | 43020 | jjdelcerro | ) |
116 | ) |
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117 | ); |
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118 | } |
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119 | } |
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120 | 44198 | jjdelcerro | sqlbuilder.setProperties( |
121 | Variable.class, |
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122 | PROP_TABLE, table |
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123 | ); |
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124 | 43020 | jjdelcerro | String sql = sqlbuilder.select().toString();
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125 | |||
126 | Statement st = null; |
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127 | ResultSet rs = null; |
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128 | try {
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129 | st = conn.createStatement(); |
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130 | rs = JDBCUtils.executeQuery(st, sql); |
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131 | if (!rs.next()) {
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132 | return null; |
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133 | } |
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134 | Geometry geom = this.helper.getGeometryFromColumn(rs, 1); |
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135 | if (geom == null) { |
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136 | return null; |
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137 | } |
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138 | return geom.getEnvelope();
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139 | |||
140 | } catch (SQLException ex) { |
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141 | throw new JDBCSQLException(ex); |
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142 | } finally {
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143 | JDBCUtils.closeQuietly(st); |
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144 | JDBCUtils.closeQuietly(rs); |
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145 | } |
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146 | } |
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147 | |||
148 | } |