Linux下C++访问MySQL

1:安装MySQL

挂载光盘：

mkdir /cdrom

mount /dev/hdc /cdrom

cd /cdrom/Server

rpm -ivh perl-DBI-1.52-2.el5.i386.rpm

rpm -ivh mysql-5.0.45-7.el5.i386.rpm mysql-bench-5.0.45-7.el5.i386.rpm mysql-devel-5.0.45-7.el5.i386.rpm

rpm -ivh perl-DBD-MySQL-3.0007-2.el5.i386.rpm

rpm -ivh mysql-server-5.0.45-7.el5.i386.rpm mysql-test-5.0.45-7.el5.i386.rpm

查看mysql服务状态：

service mysqld status

启动服务：

service mysqld start

连接数据库：

mysql

2：安装gcc工具包

rpm -ivh gcc* --force --nodeps 强制安装

3：进入mysql

create table t1 (id int,name varchar(30));

t1表插入数据：

1.cpp

#include <iostream>

#include <mysql/mysql.h>

#include <string>

using namespace std;

main()

{

MYSQL mysql;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", "test", 3306, NULL, 0);

string sql = "insert into t1 (id, name) values (1, 'java1');";

mysql_query(&mysql, sql.c_str());

mysql_close(&mysql);

}

g++ -o 1.out 1.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql

更新mysql数据；

1.cpp

#include <iostream>

#include <mysql/mysql.h>

#include <string>

using namespace std;

main()

{

MYSQL mysql;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", "test", 3306, NULL, 0);

string sql = "insert into t1 (id,name) values (2, 'java2'),(3, 'java3');";

mysql_query(&mysql, sql.c_str());

sql = "update t1 set name = 'java33' where id = 3;";

mysql_query(&mysql, sql.c_str());

mysql_close（&mysql);

}

g++ -o 1.out 1.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql

./1.out

mysql 存储过程：

mysql>delimiter //

>create procedure p01()

>begin

>insert into t1 (id,name) values (66, 'java66');

>end;

>//

应用存储过程：

vi 2.cpp

#include <stream>

#include <mysql/mysql.h>

#include <string>

using namespace std;

main()

{

MYSQL mysql;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", "test", 3306, NULL, 0);

string sql = "call p01();";

mysql_query(&mysql, sql.c_str());

mysql_close(&mysql);

}

g++ -o 2.out 2.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql

./2.out

delimiter; 返回mysql ;结束

触发器：

新建t2表：

mysql>delimiter //

>create trigger tr1 after insert on t1 for each row

>begin

>insert into t2 (id,name) values (new.id,new.name);

>end;

>//

>delete from t1 where id = 66;

>//

>delimeter ;

vi 3.cpp

#include <iostream>

#include <string>

#include <mysql/mysql.h>

using namespace std;

main()

{

MYSQL mysql;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", 3306, NULL, 0);

string sql = "call p01();";

mysql_query(&mysql, sql.c_str());

mysql_close(&mysql);

}

g++ -o 3.out 3.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql

./3.out

mysql>delimeter ;

>select * from t1;

>select * from t2;

>存在数据(66, 'java66')

查看表中数据的总数：

vi 4.cpp

#include <iostream>

#include <string>

#include <mysql/mysql.h>

using namespace std;

main()

{

MYSQL mysql;

MYSQL_RES *result = NULL;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", "test", 3306, NULL, 0);

string sql = "select id,name from t1;";

mysql_query(&mysql, sql.c_str());

result = mysql_store_result(&mysql);

int rowcount = mysql_num_rows(result);

cout << rowcount << endl;

mysql_close(&mysql);

}

g++ -o 4.out 4.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql

./4.out

查处字段的总数:

vi 5.cpp

#include <iostream>

#include <string>

#include <mysql/mysql.h>

using namespace std;

main()

{

MYSQL mysql;

MYSQL_RES *result = NULL;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", 3306, NULL, 0);

string str = "select id,name from t1;";

mysql_query(&mysql, sql.c_str());

result = mysql_store_result(&mysql);

int rowcount = mysql_num_rows(result);

cout << rowcount << endl;

int fieldcount = mysql_num_fields(result);

cout << fieldcount << endl;

mysql_close(&mysql);

}

g++ -o 5.out 5.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql

./5.out

列出具体字段名：

vi 6.cpp

#include <iostream>

#include <string>

#include <mysql/mysql.h>

using namespace std;

main()

{

MYSQL mysql;

MYSQL_RES *result = NULL;

MYSQL_FIELD *field = NULL;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", "test", 3306, NULL, 0);

string str = "select id,name from t1;";

mysql_query(&mysql, sql.c_str());

result = mysql_store_result(&mysql);

int rowcount = mysql_num_rows(result);

cout << rowcount << endl;

int fieldcount = mysql_num_fields(result);

cout << fieldcount << endl;

for(int i = 0; i < fieldcount; i++)

{

field = mysql_fetch_field_direct(result,i);

cout << field->name << "\t\t";

}

cout << endl;

mysql_close(&mysql);

}

g++ -o 6.out 6.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql

./6.out

显示表中所有数据：

vi 7.cpp

#include <iostream>

#include <string>

#include <mysql/mysql.h>

using namespace std;

main()

{

MYSQL mysql;

MYSQL_RES *result = NULL;

MYSQL_FIELD *field = NULL;

mysql_init(&mysql);

mysql_real_connect(&mysql, "localhost", "root", "root", 3306, NULL, 0);

string str = "select id,name from t1;";

mysql_query(&mysql, sql.c_str());

result = mysql_store_result(&mysql);

int rowcount = mysql_num_rows(result);

cout << rowcount << endl;

int fieldcount = mysql_num_fields(result);

cout << fieldcount << endl;

for(int i = 0; i < fieldcount; i++)

{

field = mysql_fetch_field_direct(result,i);

cout << field->name << "\t\t";

}

cout << endl;

MYSQL_ROW row = NULL;

row = mysql_fetch_row(result);

while(NULL != row)

{

for(int i=1; i<fieldcount; i++)

{

cout << row[i] << "\t\t";

}

cout << endl;

row = mysql_fetch_row(result);

}

mysql_close(&mysql);

}

g++ -o 7.out 7.cpp -lmysqlclient -I/usr/include/mysql/ -L/usr/lib/mysql
./out