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鍍金池/ 教程/ 數(shù)據(jù)庫(kù)/ C/C++連接PostgreSQL數(shù)據(jù)庫(kù)
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C/C++連接PostgreSQL數(shù)據(jù)庫(kù)

本教程將使用libpqxx庫(kù)，它是PostgreSQL的官方C++客戶端API。 libpqxx的源代碼可以在BSD許可證下使用，因此您可以免費(fèi)下載它，將其傳遞給其他人，更改它，銷(xiāo)售，將其包含在您自己的代碼中，并與任何人分享您的更改/修改。

安裝

最新版本的libpqxx可從鏈接下載：Libpqxx下載。 所以下載最新版本，并按照以下步驟：

wget http://pqxx.org/download/software/libpqxx/libpqxx-4.0.tar.gz
tar xvfz libpqxx-4.0.tar.gz
cd libpqxx-4.0
./configure
make
make install

在開(kāi)始使用C/C++的PostgreSQL接口之前，請(qǐng)?jiān)赑ostgreSQL安裝目錄中找到pg_hba.conf文件，并添加以下行：

# IPv4 local connections:
host    all         all         127.0.0.1/32          md5

可以啟動(dòng)/重新啟動(dòng)postgres服務(wù)器，使用以下命令運(yùn)行：

[root@host]# service postgresql restart
Stopping postgresql service:                               [  OK  ]
Starting postgresql service:                               [  OK  ]

C/C++連接到PostgreSQL數(shù)據(jù)庫(kù)

以下C代碼段顯示如何連接到端口5432上本地機(jī)器上運(yùn)行的現(xiàn)有數(shù)據(jù)庫(kù)。在這里，我使用反斜杠\行繼續(xù)。

#include <iostream>
#include <pqxx/pqxx> 

using namespace std;
using namespace pqxx;

int main(int argc, char* argv[])
{
   try{
      connection C("dbname=testdb user=postgres password=cohondob \
      hostaddr=127.0.0.1 port=5432");
      if (C.is_open()) {
         cout << "Opened database successfully: " << C.dbname() << endl;
      } else {
         cout << "Can't open database" << endl;
         return 1;
      }
      C.disconnect ();
   }catch (const std::exception &e){
      cerr << e.what() << std::endl;
      return 1;
   }
}

現(xiàn)在，我們編譯并運(yùn)行上面的程序來(lái)連接到數(shù)據(jù)庫(kù)testdb，它已經(jīng)在你的架構(gòu)中可用，可以使用用戶postgres和密碼為：pass123進(jìn)行訪問(wèn)。 您可以根據(jù)數(shù)據(jù)庫(kù)設(shè)置使用用戶名和密碼。記住保持-lpqxx和-lpq在給定的順序！ 否則，鏈接器將抱怨關(guān)于缺少以“PQ”開(kāi)頭的名稱的函數(shù)。

$g++ test.cpp -lpqxx -lpq
$./a.out
Opened database successfully: testdb

創(chuàng)建表

以下C代碼段將用于在之前創(chuàng)建的數(shù)據(jù)庫(kù)(testdb)中創(chuàng)建一個(gè)表：

#include <iostream>
#include <pqxx/pqxx> 

using namespace std;
using namespace pqxx;

int main(int argc, char* argv[])
{
   char * sql;

   try{
      connection C("dbname=testdb user=postgres password=cohondob \
      hostaddr=127.0.0.1 port=5432");
      if (C.is_open()) {
         cout << "Opened database successfully: " << C.dbname() << endl;
      } else {
         cout << "Can't open database" << endl;
         return 1;
      }
      /* Create SQL statement */
      sql = "CREATE TABLE COMPANY("  \
      "ID INT PRIMARY KEY     NOT NULL," \
      "NAME           TEXT    NOT NULL," \
      "AGE            INT     NOT NULL," \
      "ADDRESS        CHAR(50)," \
      "SALARY         REAL );";

      /* Create a transactional object. */
      work W(C);

      /* Execute SQL query */
      W.exec( sql );
      W.commit();
      cout << "Table created successfully" << endl;
      C.disconnect ();
   }catch (const std::exception &e){
      cerr << e.what() << std::endl;
      return 1;
   }

   return 0;
}

當(dāng)編譯和執(zhí)行上述程序時(shí)，它將在testdb數(shù)據(jù)庫(kù)中創(chuàng)建一張COMPANY表，并顯示以下語(yǔ)句：

Opened database successfully: testdb
Table created successfully

插入操作

以下C代碼段顯示了如何在上述示例中創(chuàng)建的COMPANY表中創(chuàng)建記錄：

#include <iostream>
#include <pqxx/pqxx> 

using namespace std;
using namespace pqxx;

int main(int argc, char* argv[])
{
   char * sql;

   try{
      connection C("dbname=testdb user=postgres password=cohondob \
      hostaddr=127.0.0.1 port=5432");
      if (C.is_open()) {
         cout << "Opened database successfully: " << C.dbname() << endl;
      } else {
         cout << "Can't open database" << endl;
         return 1;
      }
      /* Create SQL statement */
      sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
      "VALUES (1, 'Paul', 32, 'California', 20000.00 ); " \
      "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
      "VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); "     \
      "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
      "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" \
      "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
      "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";

      /* Create a transactional object. */
      work W(C);

      /* Execute SQL query */
      W.exec( sql );
      W.commit();
      cout << "Records created successfully" << endl;
      C.disconnect ();
   }catch (const std::exception &e){
      cerr << e.what() << std::endl;
      return 1;
   }

   return 0;
}

當(dāng)上述程序被編譯和執(zhí)行時(shí)，它將在COMPANY表中創(chuàng)建給定的記錄，并顯示以下兩行：

Opened database successfully: testdb
Records created successfully

SELECT操作

以下C代碼段顯示了如何從上述示例中創(chuàng)建的COMPANY表中獲取和顯示記錄：

#include <iostream>
#include <pqxx/pqxx> 

using namespace std;
using namespace pqxx;

int main(int argc, char* argv[])
{
   char * sql;

   try{
      connection C("dbname=testdb user=postgres password=cohondob \
      hostaddr=127.0.0.1 port=5432");
      if (C.is_open()) {
         cout << "Opened database successfully: " << C.dbname() << endl;
      } else {
         cout << "Can't open database" << endl;
         return 1;
      }
      /* Create SQL statement */
      sql = "SELECT * from COMPANY";

      /* Create a non-transactional object. */
      nontransaction N(C);

      /* Execute SQL query */
      result R( N.exec( sql ));

      /* List down all the records */
      for (result::const_iterator c = R.begin(); c != R.end(); ++c) {
         cout << "ID = " << c[0].as<int>() << endl;
         cout << "Name = " << c[1].as<string>() << endl;
         cout << "Age = " << c[2].as<int>() << endl;
         cout << "Address = " << c[3].as<string>() << endl;
         cout << "Salary = " << c[4].as<float>() << endl;
      }
      cout << "Operation done successfully" << endl;
      C.disconnect ();
   }catch (const std::exception &e){
      cerr << e.what() << std::endl;
      return 1;
   }

   return 0;
}

當(dāng)上述程序被編譯和執(zhí)行時(shí)，將產(chǎn)生以下結(jié)果：

Opened database successfully: testdb
ID = 1
Name = Paul
Age = 32
Address = California
Salary = 20000
ID = 2
Name = Allen
Age = 25
Address = Texas
Salary = 15000
ID = 3
Name = Teddy
Age = 23
Address = Norway
Salary = 20000
ID = 4
Name = Mark
Age = 25
Address = Rich-Mond
Salary = 65000
Operation done successfully

更新操作

以下C代碼段顯示了如何使用UPDATE語(yǔ)句來(lái)更新指定記錄，然后從COMPANY表中獲取并顯示更新的記錄：

#include <iostream>
#include <pqxx/pqxx> 

using namespace std;
using namespace pqxx;

int main(int argc, char* argv[])
{
   char * sql;

   try{
      connection C("dbname=testdb user=postgres password=cohondob \
      hostaddr=127.0.0.1 port=5432");
      if (C.is_open()) {
         cout << "Opened database successfully: " << C.dbname() << endl;
      } else {
         cout << "Can't open database" << endl;
         return 1;
      }

      /* Create a transactional object. */
      work W(C);
      /* Create  SQL UPDATE statement */
      sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1";
      /* Execute SQL query */
      W.exec( sql );
      W.commit();
      cout << "Records updated successfully" << endl;

      /* Create SQL SELECT statement */
      sql = "SELECT * from COMPANY";

      /* Create a non-transactional object. */
      nontransaction N(C);

      /* Execute SQL query */
      result R( N.exec( sql ));

      /* List down all the records */
      for (result::const_iterator c = R.begin(); c != R.end(); ++c) {
         cout << "ID = " << c[0].as<int>() << endl;
         cout << "Name = " << c[1].as<string>() << endl;
         cout << "Age = " << c[2].as<int>() << endl;
         cout << "Address = " << c[3].as<string>() << endl;
         cout << "Salary = " << c[4].as<float>() << endl;
      }
      cout << "Operation done successfully" << endl;
      C.disconnect ();
   }catch (const std::exception &e){
      cerr << e.what() << std::endl;
      return 1;
   }

   return 0;
}

當(dāng)上述程序被編譯和執(zhí)行時(shí)，將產(chǎn)生以下結(jié)果：

Opened database successfully: testdb
Records updated successfully
ID = 2
Name = Allen
Age = 25
Address = Texas
Salary = 15000
ID = 3
Name = Teddy
Age = 23
Address = Norway
Salary = 20000
ID = 4
Name = Mark
Age = 25
Address = Rich-Mond
Salary = 65000
ID = 1
Name = Paul
Age = 32
Address = California
Salary = 25000
Operation done successfully

刪除操作

以下C代碼段顯示了如何使用DELETE語(yǔ)句刪除指定記錄，然后再COMPANY表中獲取并顯示剩余的記錄：

#include <iostream>
#include <pqxx/pqxx> 

using namespace std;
using namespace pqxx;

int main(int argc, char* argv[])
{
   char * sql;

   try{
      connection C("dbname=testdb user=postgres password=cohondob \
      hostaddr=127.0.0.1 port=5432");
      if (C.is_open()) {
         cout << "Opened database successfully: " << C.dbname() << endl;
      } else {
         cout << "Can't open database" << endl;
         return 1;
      }

      /* Create a transactional object. */
      work W(C);
      /* Create  SQL DELETE statement */
      sql = "DELETE from COMPANY where ID = 2";
      /* Execute SQL query */
      W.exec( sql );
      W.commit();
      cout << "Records deleted successfully" << endl;

      /* Create SQL SELECT statement */
      sql = "SELECT * from COMPANY";

      /* Create a non-transactional object. */
      nontransaction N(C);

      /* Execute SQL query */
      result R( N.exec( sql ));

      /* List down all the records */
      for (result::const_iterator c = R.begin(); c != R.end(); ++c) {
         cout << "ID = " << c[0].as<int>() << endl;
         cout << "Name = " << c[1].as<string>() << endl;
         cout << "Age = " << c[2].as<int>() << endl;
         cout << "Address = " << c[3].as<string>() << endl;
         cout << "Salary = " << c[4].as<float>() << endl;
      }
      cout << "Operation done successfully" << endl;
      C.disconnect ();
   }catch (const std::exception &e){
      cerr << e.what() << std::endl;
      return 1;
   }

   return 0;
}

當(dāng)上述程序被編譯和執(zhí)行時(shí)，將產(chǎn)生以下結(jié)果：

Opened database successfully: testdb
Records deleted successfully
ID = 3
Name = Teddy
Age = 23
Address = Norway
Salary = 20000
ID = 4
Name = Mark
Age = 25
Address = Rich-Mond
Salary = 65000
ID = 1
Name = Paul
Age = 32
Address = California
Salary = 25000
Operation done successfully