查询所有函数: SELECT * FROM pg_proc; 更新坐标系st_setsrid,查看坐标系:st_srid 创建空间索引: CREATE INDEX [indexname] ON [tablename] USING GIST ( [geometryfield] ); example:create index idx_poi5_geom on poi5 using gist(geom); 使用空间查询: select count(*) from poi5 a,poi5 b where…
UBoot常用命令手册 U-Boot还提供了更加详细的命令帮助,可以通过”?”显示支持的命令列表,通过help [CommandName]命令还可以查看每个命令的参数说明. 1.bootm bootm [addr [arg ...]] - boot application image stored in memory passing arguments 'arg ...'; when booting a Linux kernel, 'arg' can be the address of an i…