ST_SetBandIndex
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名称

ST_SetBandIndex — 更新外部数据库外波段的外部波段编号

概要

raster ST_SetBandIndex(raster rast, integer band, integer outdbindex, boolean force=false);

描述

更新数据库外波段的外部波段编号。这不会影响与数据库外波段关联的外部栅格文件。

[Note]

如果 force 设置为 true，则不会进行任何测试以确保外部栅格文件和 PostGIS 栅格之间的兼容性（例如，对齐、像素支持）。 此模式适用于在外部栅格文件中移动波段的情况。
[Note]

在内部，此方法将 PostGIS 栅格在索引 band 处的波段替换为一个新波段，而不是更新现有的路径信息。

可用性: 2.5.0

示例

WITH foo AS (
    SELECT
        ST_AddBand(NULL::raster, '/home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif', NULL::int[]) AS rast
)
SELECT
    1 AS query,
    *
FROM ST_BandMetadata(
    (SELECT rast FROM foo),
    ARRAY[1,3,2]::int[]
)
UNION ALL
SELECT
    2,
    *
FROM ST_BandMetadata(
    (
        SELECT
            ST_SetBandIndex(
                rast,
                2,
                1
            ) AS rast
        FROM foo
    ),
    ARRAY[1,3,2]::int[]
)
ORDER BY 1, 2;

 query | bandnum | pixeltype | nodatavalue | isoutdb |                                      path                                       | outdbbandnum
-------+---------+-----------+-------------+---------+---------------------------------------------------------------------------------+--------------
     1 |       1 | 8BUI      |             | t       | /home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif       |            1
     1 |       2 | 8BUI      |             | t       | /home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif       |            2
     1 |       3 | 8BUI      |             | t       | /home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif       |            3
     2 |       1 | 8BUI      |             | t       | /home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif       |            1
     2 |       2 | 8BUI      |             | t       | /home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif       |            1
     2 |       3 | 8BUI      |             | t       | /home/pele/devel/geo/postgis-git/raster/test/regress/loader/Projected.tif       |            3