Postgresql 提供了外键表的功能，sqlite_fdw唯一的遗憾是只能select，希望github上能够尽快更新吧！
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下面我把sqlite_fdw 如何使用介绍下！
1、下载sqlite_fdw 软件包：
git clone https://github.com/gleu/sqlite_fdw 或者下载 .ZIP压缩文件
make
[postgres@mxl sqlite_fdw]$ make
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -O2 -fpic -I. -I./ -I/usr/local/pgsql/include/server -I/usr/local/pgsql/include/internal -D_GNU_SOURCE -I/usr/include/libxml2 -c -o src/sqlite_fdw.o src/sqlite_fdw.c
gcc -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -O2 -fpic -shared -o sqlite_fdw.so src/sqlite_fdw.o -L/usr/local/pgsql/lib -Wl,--as-needed -Wl,-rpath,'/usr/local/pgsql/lib',--enable-new-dtags -lsqlite3
make install
[root@mxl sqlite_fdw]# make install
/bin/mkdir -p '/usr/local/pgsql/lib'
/bin/mkdir -p '/usr/local/pgsql/share/extension'
/bin/mkdir -p '/usr/local/pgsql/share/extension'
/bin/mkdir -p '/usr/local/pgsql/share/doc/extension'
/usr/bin/install -c -m 755 sqlite_fdw.so '/usr/local/pgsql/lib/sqlite_fdw.so'
/usr/bin/install -c -m 644 sqlite_fdw.control '/usr/local/pgsql/share/extension/'
/usr/bin/install -c -m 644 sql/sqlite_fdw--0.0.1.sql '/usr/local/pgsql/share/extension/'
/usr/bin/install -c -m 644 doc/sqlite_fdw.md '/usr/local/pgsql/share/doc/extension/'
2、在数据库引用sqlite_fdw
postgres=# CREATE EXTENSION sqlite_fdw;
CREATE EXTENSION
postgres=# \dx ;
List of installed extensions
Name | Version | Schema | Description
--------------------+---------+------------+-----------------------------------------------------------
pg_stat_statements | 1.2 | public | track execution statistics of all SQL statements executed
plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language
sqlite_fdw | 0.0.1 | public | SQLite Foreign Data Wrapper
uuid-ossp | 1.0 | public | generate universally unique identifiers (UUIDs)
(4 rows)
3、创建一个fdw的server
CREATE SERVER sqlite_server FOREIGN DATA WRAPPER sqlite_fdw OPTIONS (database '/tmp/localdb.sqlite');
4、创建外键表
CREATE FOREIGN TABLE fdwuserrole(userid integer,roleid ingeter) SERVER sqlite_server OPTIONS (table 'userrole');
5、查看外键表server
postgres=# \des
List of foreign servers
Name | Owner | Foreign-data wrapper
---------------+----------+----------------------
sqlite_server | postgres | sqlite_fdw
(1 row)
6、删除外键表
drop FOREIGN table fdwuserrole;
问题：1
src/sqlite_fdw.c:37:21: error: sqlite3.h: No such file or directory
make 的时候提示解析不了sqlite头文件
rpm -Uvh http://www6.atomicorp.com/channels/atomic/centos/6/x86_64/RPMS/atomic-release-1.0-21.el6.art.noarch.rpm
yum update
yum sqlite-devel install -y
问题：2
安装sqlite_fdw的时候需要使用postgres 的pg_config 所以需要把postgres 的环境变量在root 添加一下
