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Figure 3–4 Map with geoFeature Element Showing Two Concentric Circles
3.2.6 jdbc_georaster_query Element
The jdbc_georaster_query element, which is used to define a GeoRaster theme, has the following definition:
ELEMENT jdbc_georaster_query PCDATA ATTLIST jdbc_georaster_query
asis TRUE|FALSE FALSE georaster_table CDATA REQUIRED
georaster_column CDATA REQUIRED raster_id CDATA IMPLIED
raster_table CDATA IMPLIED raster_pyramid CDATA IMPLIED
raster_bands CDATA IMPLIED datasource CDATA IMPLIED
polygon_mask CDATA IMPLIED transparent_nodata CDATA IMPLIED
jdbc_host CDATA IMPLIED jdbc_port CDATA IMPLIED
jdbc_sid CDATA IMPLIED jdbc_user CDATA IMPLIED
jdbc_password CDATA IMPLIED jdbc_srid CDATA IMPLIED
jdbc_mode thin|oci8 thin
For detailed usage and reference information about GeoRaster themes, see Section 2.3.4
.
3.2.7 jdbc_image_query Element
The jdbc_image_query element, which is used to define an image theme described in
Section 2.3.3 , has the following definition:
ELEMENT jdbc_image_query PCDATA ATTLIST jdbc_image_query
asis TRUE|FALSE FALSE image_format CDATA REQUIRED
MapViewer Map Request XML API 3-39
image_column CDATA REQUIRED image_mbr_column CDATA REQUIRED
image_resolution CDATA IMPLIED image_unit CDATA IMPLIED
datasource CDATA IMPLIED jdbc_host CDATA IMPLIED
jdbc_port CDATA IMPLIED jdbc_sid CDATA IMPLIED
jdbc_user CDATA IMPLIED jdbc_password CDATA IMPLIED
jdbc_srid CDATA IMPLIED jdbc_mode thin|oci8 thin
To define a theme dynamically, you must supply a valid SQL query as the content of the jdbc_image_query element. You must specify the JDBC connection
information for an image theme either datasource or the combination of jdbc_ host, jdbc_port, jdbc_sid, jdbc_user, and jdbc_password.
jdbc_srid is an optional attribute that specifies the coordinate system SDO_SRID value of the data to be rendered.
jdbc_mode identifies the Oracle JDBC driver thin or oci8 to use to connect to the database.
asis is an optional attribute. If it is set to TRUE, MapViewer does not attempt to modify the supplied query string. If asis is FALSE the default, MapViewer embeds
the SQL query as a subquery of its spatial filter query. For example, assume that you want a map centered at -122, 37 with size 1, and the supplied query is:
SELECT geometry, sales FROM crm_sales WHERE sales 100000; If asis is FALSE, the actual query that MapViewer executes is similar to:
SELECT FROM SELECT geometry, sales FROM crm_sales WHERE sales 100000
WHERE sdo_filtergeometry, sdo_geometry. . . -122.5, 36.5, -123.5, 37.5 . . . =TRUE;
In other words, the original query is further refined by a spatial filter query for the current map window. However, if asis is TRUE, MapViewer executes the query as
specified, namely:
SELECT geometry, sales FROM crm_sales WHERE sales 100000; image_format identifies the format such as GIF or JPEG of the image data. If the
image format is not supported by MapViewer, you must create and register a custom image renderer for the format, as explained in
Appendix C .
image_column identifies the column of type BLOB where each image is stored. image_mbr_column identifies the column of type SDO_GEOMETRY where the
footprint minimum bounding rectangle, or MBR of each image is stored. image_resolution is an optional attribute that identifies the original image
resolution number of image_unit units for each pixel. image_unit is an optional attribute, except it is required if you specify the image_
resolution attribute. The image_unit attribute specifies the unit of the resolution, such as M for meter. The value for this attribute must be one of the values in the SDO_
UNIT column of the MDSYS.SDO_DIST_UNITS table. In Example 2–12
in Section 2.3.3.1
, the image resolution is 2 meters per pixel.
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For an example of using the jdbc_image_query element to specify an image theme, see
Example 3–6 in
Section 3.1.6 .
3.2.8 jdbc_network_query Element
