通过unixODBC访问PostgreSQL数据库
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步骤1，先安装PostgreSQL
具体不详述，参考PostgreSQL的官方文档或下载、解压后的INSTALL文件中的指令即可
运行configure时指定安装目录：./configure --prefix=/usr/local/pgsql
我安装的是 PostgreSQL9.1.2
步骤2，再安装unixODBC
下载 unixODBC-2.3.1.tar.gz，以postgres 用户身份进行解压。
然后运行：./configure --prefix=/usr/local/unixodbc
然后 make
sudo make install
步骤3，再安装psqlodbc
一开始安装的是psqlodbc-09.01.0200.tar.gz，make的时候，发现和unixODBC有冲突。
查阅文档，解决方法是-----换版本！
所以，下载 psqlodbc-09.02.0100.tar.gz
以postgres用户身份解压缩，然后运行：
export LD_LIBRARY_PATH=/usr/local/unixodbc/lib:$LD_LIBRARY_PATH
./configure --prefix=/usr/local/psqlodbc --with-libpq=/usr/local/pgsql/ --with-unixodbc=/usr/local/pgsql/unixodbc/
再运行：
make
sudo make install
步骤4，配置unixODBC
[root@server etc]# pwd
/usr/local/unixodbc/etc
[root@server etc]# ls
ODBCDataSources odbc.ini odbcinst.ini
[root@server etc]# cat odbcinst.ini
[PostgreSQL]
Description=PostgreSQL driver for Linux
Driver=/usr/local/psqlodbc/lib/psqlodbcw.so
Setup=/usr/local/psqlodbc/lib/psqlodbcw.so
UsageCount=1
[root@server etc]# cat odbc.ini
[GaoTest]
Description=Test for Mr Gao
Driver=PostgreSQL
Trace=Yes
TraceFile=sql.log
Database=postgres
Servername=localhost
UserName=postgres
Password=postgres
Port=5432
Protocol=6.4
ReadOnly=No
RowVersioning=No
ShowSystemTables=No
ShowOidColumn=No
FakeOidIndex=No
ConnSettings=
[root@server etc]#
步骤5，验证
通过isql来验证是否可以连接到postgresql，
运行中通过strace跟踪发现，isql需要在几个目录中寻找libpq.so.5
open("/usr/local/unixodbc/lib/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/local/unixodbc/lib/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/tls/x86_64/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib64/tls/x86_64", 0x7fff7fdcd0b0) = -1 ENOENT (No such file or directory)
open("/lib64/tls/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib64/tls", 0x7fff7fdcd0b0) = -1 ENOENT (No such file or directory)
open("/lib64/x86_64/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib64/x86_64", 0x7fff7fdcd0b0) = -1 ENOENT (No such file or directory)
open("/lib64/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/lib64", {st_mode=S_IFDIR|0755, st_size=12288, ...}) = 0
open("/usr/lib64/tls/x86_64/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib64/tls/x86_64", 0x7fff7fdcd0b0) = -1 ENOENT (No such file or directory)
open("/usr/lib64/tls/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib64/tls", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/usr/lib64/x86_64/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib64/x86_64", 0x7fff7fdcd0b0) = -1 ENOENT (No such file or directory)
open("/usr/lib64/libpq.so.5", O_RDONLY) = -1 ENOENT (No such file or directory)
stat("/usr/lib64", {st_mode=S_IFDIR|0755, st_size=106496, ...}) = 0
于是在lib64目录下建立到 libpq.so.5的链接：
[root@server lib64]# pwd
/lib64
[root@server lib64]#
[root@server lib64]# ls -lrt libpq.so.5
lrwxrwxrwx 1 root root 31 9月 17 17:48 libpq.so.5 -> /usr/local/pgsql/lib/libpq.so.5
然后再次运行isql:
[root@server etc]# cd /usr/local/unixodbc/bin
[root@server bin]# ./isql -v GaoTest
+---------------------------------------+
| Connected! |
| |
| sql-statement |
| help [tablename] |
| quit |
| |
+---------------------------------------+
SQL> quit
[root@server bin]#
[作者 高健@博客园 luckyjackgao@gmail.com]
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