postgresql-9.1.9编译及简单CGI访问数据库

发布时间：2020-12-13 17:30:18 所属栏目：百科来源：网络整理

导读：1：编译 linux直接执行以下命令： ./configure --prefix=/work/postgresql-9.1.9/binpost 当进行交叉编译的时如下：我的编译是有些问题直接跳过了下面俩个包的检测 ./configure --host=arm-none-linux-gnueabi --prefix=/work/postgresql-9.1.9/binpost --wi

1：编译

linux直接执行以下命令：
./configure --prefix=/work/postgresql-9.1.9/binpost
当进行交叉编译的时如下：我的编译是有些问题直接跳过了下面俩个包的检测
./configure --host=arm-none-linux-gnueabi --prefix=/work/postgresql-9.1.9/binpost --without-readline --without-zlib

2：创建数据库目录及用户

创建用户postgresql
roupadd postgresql
useradd -g postgresql postgresql
创建数据库目录和日志目录
mkdir /usr/local/pgsql/data
mkdir -p /usr/local/pgsql/log
touch /usr/local/pgsql/log/pgsql.log
改变属主:
chown -R postgresql:postgresql /usr/local/pgsql/data
chown -R postgresql:postgresql /usr/local/pgsql/log
chown -R postgresql:postgresql /usr/local/pgsql/log/pgsql.log

3：初始化及创建数据库
su - postgresql
initdb -D /usr/local/pgsql/data
启动数据库：pg_ctl -D /usr/local/pgsql/data -l /usr/local/pgsql/log/pgsql.log start
[root@localhost /work/postgresql-9.1.9]$pg_ctl -D /usr/local/pgsql/data -l /usr/local/pgsql/log/pgsql.log start
pg_ctl: cannot be run as root
Please log in (using,e.g.,"su") as the (unprivileged) user that will
own the server process.
[root@localhost /work/postgresql-9.1.9]$
上面是因为用户的原因，故需要切换到之前创建的用户postgresql。
当切换用户之后：启动数据库。
postgresql@localhost ~]$ pg_ctl -D /usr/local/pgsql/data -l /usr/local/pgsql/log/pgsql.log start
server starting

4：创建database及tables
创建数据库用户
createuser -sADEP psmpAdmin
访问数据库： psql -d psmp -U psmpAdmin
[postgresql@localhost ~]$ psql -d psmp -U psmpAdmin
psql (8.4.1)
Type "help" for help.
psmp=> d
List of relations
Schema | Name | Type | Owner
--------+---------+-------+-----------
public | company | table | psmpAdmin
(1 row)

psmp=> l
List of databases
Name | Owner | Encoding | Collation | Ctype | Access privileges
-----------+------------+----------+-------------+-------------+---------------------------
postgres | postgresql | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
psmp | postgresql | UTF8 | en_US.UTF-8 | en_US.UTF-8 |
template0 | postgresql | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgresql
: postgresql=CTc/postgresql
template1 | postgresql | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgresql
: postgresql=CTc/postgresql
(4 rows)

psmp=> c psmp //链接psmp数据库
psql (8.4.1)
You are now connected to database "psmp".
psmp=> select * from COMPANY;
id | name | age | address | salary | join_date
----+-------+-----+----------------------------------------------------+--------+------------
3 | Teddy | 23 | Norway | 20000 |
1 | Paul | 32 | California | 20000 | 2001-07-13
(2 rows)

psmp=>
=====================================================================================================
CREATE TABLE COMPANY(
ID INT PRIMARY KEY NOT NULL,
NAME TEXT NOT NULL,
AGE INT NOT NULL,
ADDRESS CHAR(50),
SALARY REAL,
JOIN_DATE DATE
);

drop table company;

INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (1,'Paul',32,'California',20000.00,'2001-07-13');

INSERT INTO COMPANY (ID,JOIN_DATE) VALUES (3,'Teddy',23,'Norway',DEFAULT );

SELECT * FROM COMPANY;

5：CGI代码访问数据库

#include "libpq-fe.h"
#include <stdio.h>
#include <stdlib.h>
static void exit_nicely(PGconn *conn)
{
    PQfinish(conn);
    exit(1);
}
int main()
{
		int i,nFields,j;
		struct  pg_conn * conn = 0;
		PGresult   *res = 0;
		printf("%srnrn","Content-Type:text/html");
		conn =  PQsetdbLogin("localhost","5432","","psmp","psmpAdmin","suiyuan");//succedd
		if(PQstatus(conn) != CONNECTION_OK)
		{
			printf("connect fail n");
	  }
		else
	  {
			printf("connect successn");
	  }
	   
		res = PQexec(conn,"BEGIN");
		if(PQresultStatus(res) != PGRES_COMMAND_OK)
		{
		    printf("execute sql fail %s",PQerrorMessage(conn));
		    PQclear(res);
		    exit_nicely(conn);
		}
	  PQclear(res);

    res = PQexec(conn,"DECLARE myportal CURSOR FOR select * from company");
    if (PQresultStatus(res) != PGRES_COMMAND_OK)
    {
			printf("DECLARE CURSOR failed: %s",PQerrorMessage(conn));
			PQclear(res);
			exit_nicely(conn);
    }
    PQclear(res);
    res = PQexec(conn,"FETCH ALL in myportal");
    if (PQresultStatus(res) != PGRES_TUPLES_OK)
    {
        printf("FETCH ALL failed: %s",PQerrorMessage(conn));
        PQclear(res);
        exit_nicely(conn);
    }
		nFields = PQnfields(res);
		printf("<table><font color="CC0000" size=+2>%s</font>");
		printf("<tr>");
		for (i = 0; i < nFields; i++)
		{	
			//printf("%-15s",PQfname(res,i));
			printf("<td>%s</td>",i));	
		}
		printf("</tr>");
		printf("nn");

    for (i = 0; i < PQntuples(res); i++)
		{
			   printf("<tr>");
        for (j = 0; j < nFields; j++)
        {
					//	printf("%-15s",PQgetvalue(res,i,j));
						printf("<td>%s</td>",j));	      	
        }	
				printf("</tr>");
    }
		
	 printf("</table>");

    PQclear(res);
	/*
    res = PQexec(conn,"delete from test where name = 'dog'");
    PQclear(res);
	*/
    res = PQexec(conn,"CLOSE myportal");
    PQclear(res);
    res = PQexec(conn,"END");
    PQclear(res);
    PQfinish(conn);
   return 0;
}

运行CGI程序如下：

在运行CGI的时候，需要首先 httpd 运行。CGI程序放置的位置如下：

（编辑：李大同）

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