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 @ 44058
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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 | import org.gvsig.fmap.dal.exception.DataException; |
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10 | import org.gvsig.fmap.dal.store.jdbc.exception.JDBCSQLException; |
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11 | import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
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12 | import org.gvsig.fmap.dal.store.jdbc2.JDBCUtils; |
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13 | 44058 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc2.OperationsFactory.TableReference; |
14 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase; |
15 | import org.gvsig.fmap.geom.Geometry; |
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16 | import org.gvsig.fmap.geom.primitive.Envelope; |
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17 | |||
18 | public class CalculateEnvelopeOfColumnOperation extends AbstractConnectionOperation { |
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19 | |||
20 | 44058 | jjdelcerro | private final TableReference table; |
21 | 43020 | jjdelcerro | private final String columnName; |
22 | private final String baseFilter; |
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23 | private final Envelope limit; |
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24 | private final IProjection crs; |
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25 | |||
26 | public CalculateEnvelopeOfColumnOperation(
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27 | JDBCHelper helper, |
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28 | 44058 | jjdelcerro | TableReference table, |
29 | 43020 | jjdelcerro | String columnName,
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30 | String baseFilter,
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31 | Envelope limit, |
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32 | IProjection crs |
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33 | ) { |
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34 | super(helper);
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35 | 44058 | jjdelcerro | this.table = table;
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36 | 43020 | jjdelcerro | this.columnName = columnName;
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37 | this.baseFilter = baseFilter;
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38 | this.limit = limit;
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39 | this.crs = crs;
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40 | } |
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41 | |||
42 | @Override
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43 | public final Object perform(Connection conn) throws DataException { |
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44 | Envelope env = calculateEnvelopeOfColumn( |
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45 | conn, |
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46 | 44058 | jjdelcerro | table, |
47 | 43020 | jjdelcerro | columnName, |
48 | baseFilter, |
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49 | limit, |
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50 | crs |
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51 | ); |
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52 | return env;
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53 | } |
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54 | |||
55 | public Envelope calculateEnvelopeOfColumn(
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56 | Connection conn,
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57 | 44058 | jjdelcerro | TableReference table, |
58 | 43020 | jjdelcerro | String columnName,
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59 | String baseFilter,
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60 | Envelope limit, |
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61 | IProjection crs |
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62 | ) throws DataException {
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63 | |||
64 | 43088 | jjdelcerro | //
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65 | // Parece ser que en versiones anteriores a SQL Server 2012 no esta
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66 | // disponible la funcion ST_ExtentAggregate.
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67 | // Habria que determinar si es necesario implementar una alternativa
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68 | // para estos casos.
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69 | //
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70 | // https://alastaira.wordpress.com/2011/07/26/determining-the-geographic-extent-of-spatial-features-in-a-sql-server-table/
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71 | //
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72 | 43020 | jjdelcerro | JDBCSQLBuilderBase sqlbuilder = this.createSQLBuilder();
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73 | sqlbuilder.select().column().value( |
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74 | sqlbuilder.getAsGeometry( |
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75 | sqlbuilder.ST_ExtentAggregate( |
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76 | sqlbuilder.column(columnName) |
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77 | ) |
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78 | ) |
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79 | ); |
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80 | |||
81 | 44058 | jjdelcerro | sqlbuilder.select().from().table() |
82 | .database(this.table.getDatabase())
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83 | .schema(this.table.getSchema())
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84 | .name(this.table.getTable());
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85 | sqlbuilder.select().from().subquery(this.table.getSubquery());
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86 | 43020 | jjdelcerro | |
87 | if (StringUtils.isEmpty(baseFilter)) {
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88 | if (limit != null) { |
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89 | sqlbuilder.select().where().set( |
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90 | sqlbuilder.ST_Intersects( |
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91 | sqlbuilder.ST_Envelope( |
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92 | sqlbuilder.column(columnName) |
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93 | ), |
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94 | sqlbuilder.ST_Envelope( |
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95 | sqlbuilder.geometry(limit.getGeometry(), crs) |
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96 | ) |
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97 | ) |
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98 | ); |
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99 | } |
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100 | } else {
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101 | sqlbuilder.select().where().set( sqlbuilder.custom(baseFilter) ); |
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102 | if (limit != null) { |
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103 | sqlbuilder.select().where().and( |
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104 | sqlbuilder.ST_Intersects( |
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105 | sqlbuilder.ST_Envelope( |
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106 | sqlbuilder.column(columnName) |
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107 | ), |
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108 | sqlbuilder.ST_Envelope( |
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109 | sqlbuilder.geometry(limit.getGeometry(), crs) |
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110 | ) |
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111 | ) |
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112 | ); |
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113 | } |
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114 | } |
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115 | |||
116 | String sql = sqlbuilder.select().toString();
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117 | |||
118 | Statement st = null; |
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119 | ResultSet rs = null; |
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120 | try {
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121 | st = conn.createStatement(); |
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122 | rs = JDBCUtils.executeQuery(st, sql); |
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123 | if (!rs.next()) {
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124 | return null; |
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125 | } |
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126 | Geometry geom = this.helper.getGeometryFromColumn(rs, 1); |
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127 | if (geom == null) { |
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128 | return null; |
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129 | } |
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130 | return geom.getEnvelope();
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131 | |||
132 | } catch (SQLException ex) { |
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133 | throw new JDBCSQLException(ex); |
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134 | } finally {
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135 | JDBCUtils.closeQuietly(st); |
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136 | JDBCUtils.closeQuietly(rs); |
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137 | } |
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138 | } |
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139 | |||
140 | } |