[英]How can you insert GeoJSON polygon into PostGIS using Java JDBC PreparedStatement placeholder?
[英]how to insert polygon to PostGIS using JDBC
我將多邊形作為一組點。 (文本或JSON表示形式)
我需要執行以下操作:
1)使用JDBC將多邊形插入PostGIS
2)我得到一個對象坐標(點),我需要檢查這個點是否在多邊形內。
我看到了不同的示例,但是沒有找到任何使用JDBC(Java)的示例。
您能否分享簡單的Java代碼段或將我指向已經存在的示例。
注意在我的情況下多邊形不是循環
謝謝奧列格。
1)你可以使用類似的東西
String url = "jdbc:postgresql://localhost:5432/test";
try (java.sql.Connection conn = DriverManager.getConnection(url, "user", "password")) {
Class.forName("org.postgresql.Driver");
GeometryFactory geometryFactory = new GeometryFactory(new PrecisionModel(), 4326);
PackedCoordinateSequenceFactory csFactory = new PackedCoordinateSequenceFactory();
CoordinateSequence sequence = csFactory.create(5, 2);
sequence.setOrdinate(0 /*first point*/, 0, 92.63671875);
sequence.setOrdinate(0 /*first point*/, 1, 56.88500172043518);
sequence.setOrdinate(1, 0, 101.66748046874999);
sequence.setOrdinate(1, 1, 56.88500172043518);
sequence.setOrdinate(2, 0, 101.66748046874999);
sequence.setOrdinate(2, 1, 59.80063426102869);
sequence.setOrdinate(3, 0, 92.63671875);
sequence.setOrdinate(3, 1, 59.80063426102869);
sequence.setOrdinate(4 /*closed point*/, 0, 92.63671875);
sequence.setOrdinate(4 /*closed point*/, 1, 56.88500172043518);
// pass an array of Coordinate or a CoordinateSequence
Polygon geo = geometryFactory.createPolygon(sequence);
// you can use it to check if this point inside polygons
// or you can use just query, something like that SELECT * FROM table_name WHERE st_contains(geom, your_point)
boolean isContains = geo.contains(geometryFactory.createPoint(new Coordinate(99.404296875,
58.60261057364717)));
WKBWriter writer = new WKBWriter();
PreparedStatement preparedStatement =
conn.prepareStatement("INSERT INTO table_name (geom) VALUES (ST_GeomFromWKB(?, 4326))");
preparedStatement.setBytes(1, writer.write(geo));
int rows = preparedStatement.executeUpdate();
if (rows > 0) {
System.out.println(" Successful insert! ");
} else {
System.out.println(" Failed insert!");
}
preparedStatement.close();
} catch (Exception e) {
e.printStackTrace();
}
dependencies for that (pom.xml, use repository http://repo.boundlessgeo.com/main/):
`<dependencies>
<dependency>
<groupId>org.locationtech.jts</groupId>
<artifactId>jts-core</artifactId>
<version>1.16.0</version>
</dependency>
<dependency>
<groupId>org.locationtech.jts</groupId>
<artifactId>jts-modules</artifactId>
<version>1.16.0</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-main</artifactId>
<version>20.1</version>
</dependency>
<dependency>
<groupId>org.geotools</groupId>
<artifactId>gt-geojson</artifactId>
<version>20.1</version>
</dependency>
<dependency>
<groupId>org.geotools.jdbc</groupId>
<artifactId>gt-jdbc-postgis</artifactId>
<version>20.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.1</version>
<scope>compile</scope>
</dependency>
</dependencies>`
2)您可以為此使用jts(如上所示),也可以使用Postgis查詢
SELECT * FROM table_name
WHERE st_contains(geom, st_setsrid(st_makepoint(99.404296875, 58.60261057364717), 4326))
您可以使用經典的JDBC調用,主要區別在於編寫的PL / SQL和使用的輸入/輸出格式。
示例:請參見org.locationtech.jts.io
示例:請參見org.locationtech.jts.geom
類和org.locationtech.jts.geom.Geometry.toText()
(導出為WKT格式)
您可以使用Postgis Geometry構造函數使用數據格式來構造對象。 有多種格式可用:WKT,EWKT,GeoJSON,GML,KML等。例如:
INSERT INTO table(geom) VALUES ST_GeomFromEWKT(?)
您可以使用Postgis 空間關系和度量功能。 就您而言, ST_Contains或ST_Intersects可能是准確的。
SELECT geom FROM table WHERE ST_Contains(geom, ST_GeomFromEWKT(?))
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