C++操作MySql

（1）首先安装MySql数据库服务：

下载：http://pan.baidu.com/s/1bn1TZsV

安装步骤：http://write.blog.csdn.net/postedit/23966241

（2）安装navicat数据库客户端：

下载：http://pan.baidu.com/s/1i3kMOy5

安装步骤：傻瓜安装，选择字符集的时候自己根据情况选择gbk2312,或者utf-8（一般涉及到网络传输或者跨平台，比如和java项目公用数据，会选择utf-8）

（3）安装odbc数据库连接驱动：

下载：http://pan.baidu.com/s/1sjPicjF

安装：http://jingyan.baidu.com/article/8065f87f38b31423312498e4.html 注意这里的安装介绍里面的：打开数据源：开始->设置->控制面板->“管理工具”找到“数据源”

（4）使用otl操作mysql

创建VS项目：

包含头文件：otl4.h 

下载：http://pan.baidu.com/s/1c0tK1jE

包含源文件：

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC // CompileOTL 4.0/ODBC
// Thefollowing #define is required with MyODBC 5.1 and higher
#define OTL_ODBC_SELECT_STM_EXECUTE_BEFORE_DESCRIBE
#define OTL_UNICODE // CompileOTL with Unicode
#include "otlv4.h"// include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
	// insert rowsinto table
{
	otl_stream o(1, //buffer size should be == 1 always on INSERT.
		"insert into test_tab values(:f1<int>,:f2<char[5]>)",
		// SQLstatement, char[5] means 5 2-byte
		// Unicodecharatcters including a null
		// terminator
		db // connectobject
		);

	unsigned short tmp[32]; // Nullterminated Unicode character array.

	for(int i=1;i<=100;++i){
		o<<i;
		tmp[0]=1111; //Unicode character (decimal code of 1111)
		tmp[1]=2222; //Unicode character (decimal code of 2222)
		tmp[2]=3333; //Unicode chracater (decimal code of 3333)
		tmp[3]=4444; //Unicode chracater (decimal code of 4444)
		tmp[4]=0; //Unicode null terminator
		o<<(unsigned char*)tmp;
		// overloadedoperator<<(const unsigned char*) in the case of Unicode
		// OTL acceptsa pointer to a Unicode character array.
		//operator<<(const unsigned short*) wasn‘t overloaded
		// in order toavoid ambiguity in C++ type casting.
	}

}

void select()
{
	otl_stream i(50, //buffer size
		" select* from test_tab "
		"where f1>= :f11<int> "
		"  and f1 <= :f12<int>*2 ",
		// SELECTstatement
		db // connectobject
		);
	// create selectstream

	int f1;
	unsigned short f2[32];

	i<<8<<8; // assigning :f11 = 8, f12 = 8
	// SELECTautomatically executes when all input variables are
	// assigned. Firstportion of output rows is fetched to the buffer

	while(!i.eof()){// while not end-of-data
		i>>f1;
		i>>(unsigned char*)f2;
		// overloaded operator>>(unsignedchar*) in the case of Unicode
		// OTL acceptsa pointer to a Unicode chracter array.
		//operator>>(unsigned short*) wasn‘t overloaded
		// in order toavoid ambiguity in C++ type casting.
		cout<<"f1="<<f1<<", f2=";
		for(int j=0;f2[j]!=0;++j)
			cout<<""<<f2[j];
		cout<<endl;
	}

	i<<4<<4; // assigning :f11 = 4, :f12 = 4
	// SELECTautomatically executes when all input variables are
	// assigned. Firstportion of output rows is fetched to the buffer

	while(!i.eof()){// while not end-of-data
		i>>f1>>(unsigned char*)f2;
		cout<<"f1="<<f1<<", f2=";
		for(int j=0;f2[j]!=0;++j)
			cout<<""<<f2[j];
		cout<<endl;
	}

}

int main()
{
	otl_connect::otl_initialize(); // initialize the database API environment
	try{
		// connect to the database user/psw/dsn,这里的dsn是odbc创建数据源的时候设置的，
		//注意dsn是odbc连接的名字，不是数据库的名字，otl是通过odbc的名字找到数据库的，
		//而这个名字对于的配置里面
		//已经包含了IP,端口等信息，只要你提供用户名和密码就可以访问了
		//见http://jingyan.baidu.com/article/8065f87f38b31423312498e4.html
		db.rlogon("root/123456@local_connect");

		otl_cursor::direct_exec
			(
			db,
			"drop table test_tab",
			otl_exception::disabled // disable OTL exceptions
			); // droptable

		otl_cursor::direct_exec
			(
			db,
			"create table test_tab(f1 int, f2 varchar(11))"
			); // create table

		insert(); //insert records into table
		select(); //select records from table

	}

	catch(otl_exception&p){ // intercept OTL exceptions
		cerr<<p.msg<<endl; // print out error message
		cerr<<p.stm_text<<endl; // print out SQL that caused the error
		cerr<<p.var_info<<endl; // print out the variable that caused the error
	}

	db.logoff(); //disconnect from the database


	getchar();

	return 0;

}

f1=8, f2=1111222233334444
f1=9, f2=1111222233334444
f1=10, f2=1111222233334444
f1=11, f2=1111222233334444
f1=12, f2=1111222233334444
f1=13, f2=1111222233334444
f1=14, f2=1111222233334444
f1=15, f2=1111222233334444
f1=16, f2=1111222233334444
f1=4, f2=1111222233334444
f1=5, f2=1111222233334444
f1=6, f2=1111222233334444
f1=7, f2=1111222233334444
f1=8, f2=1111222233334444

C++操作MySql,古老的榕树,5-wow.com