![]() The sections that follow describe the semantics of each SDO_GEOMETRY attribute, and then describe some usage considerations ( Section 2.2.6). Oracle Spatial also defines the SDO_POINT_TYPE, SDO_ELEM_INFO_ARRAY, and SDO_ORDINATE_ARRAY types, which are used in the SDO_GEOMETRY type definition, as follows:ĬREATE TYPE sdo_elem_info_array AS VARRAY (1048576) of NUMBER ĬREATE TYPE sdo_ordinate_array AS VARRAY (1048576) of NUMBER Oracle Spatial defines the object type SDO_GEOMETRY as: Tables of this sort are sometimes referred to as geometry tables. Any table that has a column of type SDO_GEOMETRY must have another column, or set of columns, that defines a unique primary key for that table. In the Spatial object-relational model, the geometric description of a spatial object is stored in a single row, in a single column of object type SDO_GEOMETRY in a user-defined table. Is a layer valid? (First, create the results table.)ĬREATE TABLE val_results (sdo_rowid ROWID, result VARCHAR2(2000)) ĮXECUTE SDO_GEOM.VALIDATE_LAYER_WITH_CONTEXT('COLA_MARKETS', 'SHAPE', SELECT c.name, SDO_GEOM.VALIDATE_GEOMETRY_WITH_CONTEXT(c.shape, 0.005)įROM cola_markets c WHERE c.name = 'cola_c' SELECT SDO_GEOM.SDO_DISTANCE(c_b.shape, c_d.shape, 0.005) Return the distance between two geometries. SELECT c.name, SDO_GEOM.SDO_AREA(c.shape, 0.005) FROM cola_markets c SELECT name, SDO_GEOM.SDO_AREA(shape, 0.005) FROM cola_markets WHERE c_b.name = 'cola_b' AND c_d.name = 'cola_d' SELECT SDO_GEOM.RELATE(c_b.shape, 'anyinteract', c_d.shape, 0.005) Do two geometries have any spatial relationship? WHERE c_a.name = 'cola_a' AND c_c.name = 'cola_c' SELECT SDO_GEOM.SDO_INTERSECTION(c_a.shape, c_c.shape, 0.005) Return the topological intersection of two geometries. Following line was for an earlier quadtree index: layer (that is, table-column combination here: COLA_MARKETS and SHAPE). before the Spatial index can be created. Update the USER_SDO_GEOM_METADATA view. Now insert an area of interest for Cola D. MDSYS.SDO_ELEM_INFO_ARRAY(1,1003,1), - one polygon (exterior polygon ring) The next two INSERT statements create areas of interest for define rectangle (lower left and upper right) with MDSYS.SDO_ORDINATE_ARRAY(1,1, 5,7) - only 2 points needed to ![]() has strong growth potential, and so on. Cola A is under competitive pressure, where Cola A ![]() example, where Cola A is the preferred drink, where The area could represent any user-defined criterion: for The next INSERT statement creates an area of interest for (For restrictions on spatial table and column names, see by residents, where the manufacturer believes the cola (for example, where the cola is most preferred Each row will be an area of interest for a specific given geography (such as city or state). Create a table for cola (soft drink) markets in a Section 2.6, "Unit of Measurement Support"Įxample 2-1 Simple Example: Inserting, Indexing, and Querying Spatial Data Section 2.5, "Spatial Index-Related Structures" Section 2.4, "Geometry Metadata Structure" Section 2.1, "Simple Example: Inserting, Indexing, and Querying Spatial Data" This chapter contains the following major sections: You may find it helpful to read this example quickly before you examine the detailed data type and metadata information later in the chapter. This chapter starts with a simple example that inserts, indexes, and queries spatial data. Spatial index creation and maintenance is done using basic DDL (CREATE, ALTER, DROP) and DML (INSERT, UPDATE, DELETE) statements. A geometry is stored as an object, in a single row, in a column of type SDO_GEOMETRY. The object-relational implementation of Oracle Spatial consists of a set of object data types, type methods, and operators, functions, and procedures that use these types.
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