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 @ 44748
History | View | Annotate | Download (6.29 KB)
1 | 43020 | jjdelcerro | package org.gvsig.fmap.dal.store.jdbc2.spi.operations; |
---|---|---|---|
2 | |||
3 | import java.sql.Connection; |
||
4 | import java.sql.ResultSet; |
||
5 | import java.sql.SQLException; |
||
6 | import java.sql.Statement; |
||
7 | 44678 | jjdelcerro | import java.util.List; |
8 | 43020 | jjdelcerro | import org.apache.commons.lang3.StringUtils; |
9 | import org.cresques.cts.IProjection; |
||
10 | 44198 | jjdelcerro | import org.gvsig.expressionevaluator.ExpressionBuilder.Variable; |
11 | 44644 | jjdelcerro | import org.gvsig.expressionevaluator.GeometryExpressionBuilder; |
12 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.exception.DataException; |
13 | 44376 | jjdelcerro | import org.gvsig.fmap.dal.feature.FeatureType; |
14 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc.exception.JDBCSQLException; |
15 | import org.gvsig.fmap.dal.store.jdbc2.JDBCHelper; |
||
16 | import org.gvsig.fmap.dal.store.jdbc2.JDBCUtils; |
||
17 | 44058 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc2.OperationsFactory.TableReference; |
18 | 43020 | jjdelcerro | import org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase; |
19 | 44198 | jjdelcerro | import static org.gvsig.fmap.dal.store.jdbc2.spi.JDBCSQLBuilderBase.PROP_TABLE; |
20 | 43020 | jjdelcerro | import org.gvsig.fmap.geom.Geometry; |
21 | import org.gvsig.fmap.geom.primitive.Envelope; |
||
22 | |||
23 | public class CalculateEnvelopeOfColumnOperation extends AbstractConnectionOperation { |
||
24 | |||
25 | 44058 | jjdelcerro | private final TableReference table; |
26 | 43020 | jjdelcerro | private final String columnName; |
27 | private final String baseFilter; |
||
28 | private final Envelope limit; |
||
29 | private final IProjection crs; |
||
30 | 44376 | jjdelcerro | private final FeatureType featureType; |
31 | 43020 | jjdelcerro | |
32 | public CalculateEnvelopeOfColumnOperation(
|
||
33 | JDBCHelper helper, |
||
34 | 44376 | jjdelcerro | FeatureType featureType, |
35 | 44058 | jjdelcerro | TableReference table, |
36 | 43020 | jjdelcerro | String columnName,
|
37 | String baseFilter,
|
||
38 | Envelope limit, |
||
39 | IProjection crs |
||
40 | ) { |
||
41 | super(helper);
|
||
42 | 44376 | jjdelcerro | this.featureType = featureType;
|
43 | 44058 | jjdelcerro | this.table = table;
|
44 | 43020 | jjdelcerro | this.columnName = columnName;
|
45 | this.baseFilter = baseFilter;
|
||
46 | this.limit = limit;
|
||
47 | this.crs = crs;
|
||
48 | } |
||
49 | |||
50 | @Override
|
||
51 | public final Object perform(Connection conn) throws DataException { |
||
52 | 44678 | jjdelcerro | Envelope env = calculateEnvelopeOfColumn(conn); |
53 | 43020 | jjdelcerro | return env;
|
54 | } |
||
55 | |||
56 | 44678 | jjdelcerro | public String getSQL() { |
57 | 43088 | jjdelcerro | //
|
58 | // Parece ser que en versiones anteriores a SQL Server 2012 no esta
|
||
59 | // disponible la funcion ST_ExtentAggregate.
|
||
60 | // Habria que determinar si es necesario implementar una alternativa
|
||
61 | // para estos casos.
|
||
62 | //
|
||
63 | // https://alastaira.wordpress.com/2011/07/26/determining-the-geographic-extent-of-spatial-features-in-a-sql-server-table/
|
||
64 | //
|
||
65 | 43020 | jjdelcerro | JDBCSQLBuilderBase sqlbuilder = this.createSQLBuilder();
|
66 | 44644 | jjdelcerro | GeometryExpressionBuilder expbuilder = sqlbuilder.expression(); |
67 | 44198 | jjdelcerro | |
68 | 43020 | jjdelcerro | sqlbuilder.select().column().value( |
69 | 44361 | jjdelcerro | // expbuilder.ifnull(
|
70 | // expbuilder.column(columnName),
|
||
71 | // expbuilder.constant(null),
|
||
72 | 44345 | jjdelcerro | expbuilder.as_geometry( |
73 | expbuilder.ST_ExtentAggregate( |
||
74 | expbuilder.column(columnName) |
||
75 | ) |
||
76 | 43020 | jjdelcerro | ) |
77 | 44361 | jjdelcerro | // )
|
78 | 43020 | jjdelcerro | ); |
79 | 44361 | jjdelcerro | // sqlbuilder.select().group_by(expbuilder.column(columnName));
|
80 | 44058 | jjdelcerro | sqlbuilder.select().from().table() |
81 | .database(this.table.getDatabase())
|
||
82 | .schema(this.table.getSchema())
|
||
83 | .name(this.table.getTable());
|
||
84 | sqlbuilder.select().from().subquery(this.table.getSubquery());
|
||
85 | 43020 | jjdelcerro | |
86 | if (StringUtils.isEmpty(baseFilter)) {
|
||
87 | if (limit != null) { |
||
88 | sqlbuilder.select().where().set( |
||
89 | 44198 | jjdelcerro | expbuilder.ST_Intersects( |
90 | expbuilder.ST_Envelope( |
||
91 | expbuilder.column(columnName) |
||
92 | 43020 | jjdelcerro | ), |
93 | 44198 | jjdelcerro | expbuilder.ST_Envelope( |
94 | expbuilder.geometry(limit.getGeometry(), crs) |
||
95 | 43020 | jjdelcerro | ) |
96 | ) |
||
97 | ); |
||
98 | } |
||
99 | } else {
|
||
100 | 44198 | jjdelcerro | sqlbuilder.select().where().set( expbuilder.custom(baseFilter) ); |
101 | 43020 | jjdelcerro | if (limit != null) { |
102 | sqlbuilder.select().where().and( |
||
103 | 44198 | jjdelcerro | expbuilder.ST_Intersects( |
104 | expbuilder.ST_Envelope( |
||
105 | expbuilder.column(columnName) |
||
106 | 43020 | jjdelcerro | ), |
107 | 44198 | jjdelcerro | expbuilder.ST_Envelope( |
108 | expbuilder.geometry(limit.getGeometry(), crs) |
||
109 | 43020 | jjdelcerro | ) |
110 | ) |
||
111 | ); |
||
112 | } |
||
113 | } |
||
114 | 44361 | jjdelcerro | sqlbuilder.select().where().and( |
115 | expbuilder.not_is_null(expbuilder.column(columnName)) |
||
116 | ); |
||
117 | 44748 | jjdelcerro | this.helper.processSpecialFunctions(sqlbuilder, featureType, null); |
118 | 44198 | jjdelcerro | sqlbuilder.setProperties( |
119 | Variable.class, |
||
120 | PROP_TABLE, table |
||
121 | ); |
||
122 | 43020 | jjdelcerro | String sql = sqlbuilder.select().toString();
|
123 | 44678 | jjdelcerro | return sql;
|
124 | } |
||
125 | |||
126 | public Envelope calculateEnvelopeOfColumn(Connection conn) throws DataException { |
||
127 | String sql = this.getSQL(); |
||
128 | |||
129 | 43020 | jjdelcerro | Statement st = null; |
130 | ResultSet rs = null; |
||
131 | try {
|
||
132 | st = conn.createStatement(); |
||
133 | 44533 | jjdelcerro | try {
|
134 | 44608 | jjdelcerro | LOGGER.debug("execute query SQL:"+sql);
|
135 | 44533 | jjdelcerro | rs = st.executeQuery(sql); |
136 | // No llamo al de JDBC utils para que no meta el error
|
||
137 | // en el log.
|
||
138 | // rs = JDBCUtils.executeQuery(st, sql);
|
||
139 | } catch(SQLException ex) { |
||
140 | // Para calcular el envelope se esta lanzando una colsulta como:
|
||
141 | // SELECT ST_AsBinary(ST_Extent("geometry"))
|
||
142 | // FROM "gis_osm_roads_free_1"
|
||
143 | // WHERE ( ("geometry") IS NOT NULL )
|
||
144 | // Que falla cuando no hay registros al recibir un NULL en el
|
||
145 | // ST_AsBinary.
|
||
146 | // A falta de una forma mejor de detectar eso, si peta en este
|
||
147 | // punto asumiremos que no hay registros en la consulta y devolveremos
|
||
148 | // null como envelope.
|
||
149 | return null; |
||
150 | } |
||
151 | 43020 | jjdelcerro | if (!rs.next()) {
|
152 | return null; |
||
153 | } |
||
154 | Geometry geom = this.helper.getGeometryFromColumn(rs, 1); |
||
155 | if (geom == null) { |
||
156 | return null; |
||
157 | } |
||
158 | return geom.getEnvelope();
|
||
159 | |||
160 | } catch (SQLException ex) { |
||
161 | throw new JDBCSQLException(ex); |
||
162 | } finally {
|
||
163 | JDBCUtils.closeQuietly(st); |
||
164 | JDBCUtils.closeQuietly(rs); |
||
165 | } |
||
166 | } |
||
167 | |||
168 | } |