//下面的代碼是一個實現C++連接MYSQL數據庫的很好的例子
//這里用了建表，插入，檢索，刪表等常用功能
//我用VC++6.0生成，已經成功連接了。
//在VC++6.0中要想把做一下兩步準備工作才可以。
//(1)Tools->Options->Directories->Include files中添加C:\Program Files\MySQL\MySQL Server 6.0\include
//(2)Tools->Options->Directories->Library files中添加C:\Program Files\MySQL\MySQL Server 6.0\lib\opt
//其實就是將頭文件和庫文件包含進來
//我覺得這個例子寫的很好，再結合自己的試驗，特地介紹給大家！

include <winsock.h>
include <iostream>
include <string>
include <mysql.h>
using namespace std;
pragma comment(lib, "ws2_32.lib")
pragma comment(lib, "libmysql.lib")
//單步執行，不想單步執行就注釋掉
define STEPBYSTEP
int main() {
    cout << "**" << endl;
ifdef STEPBYSTEP

system("pause");

endif

//必備的一個數據結構
MYSQL mydata;

//初始化數據庫
if (0 == mysql_library_init(0, NULL, NULL)) {
    cout << "mysql_library_init() succeed" << endl;
} else {
    cout << "mysql_library_init() failed" << endl;
    return -1;
}


ifdef STEPBYSTEP

system("pause");

endif

//初始化數據結構
if (NULL != mysql_init(&mydata)) {
    cout << "mysql_init() succeed" << endl;
} else {
    cout << "mysql_init() failed" << endl;
    return -1;
}


ifdef STEPBYSTEP

system("pause");

endif

//在連接數據庫之前，設置額外的連接選項
//可以設置的選項很多，這里設置字符集，否則無法處理中文
if (0 == mysql_options(&mydata, MYSQL_SET_CHARSET_NAME, "gbk")) {
    cout << "mysql_options() succeed" << endl;
} else {
    cout << "mysql_options() failed" << endl;
    return -1;
}


ifdef STEPBYSTEP

system("pause");

endif

//連接數據庫
if (NULL
        != mysql_real_connect(&mydata, "localhost", "root", "test", "test",
                3306, NULL, 0))
        //這里的地址，用戶名，密碼，端口可以根據自己本地的情況更改
        {
    cout << "mysql_real_connect() succeed" << endl;
} else {
    cout << "mysql_real_connect() failed" << endl;
    return -1;
}


ifdef STEPBYSTEP

system("pause");

endif

//sql字符串
string sqlstr;

//創建一個表
sqlstr = "CREATE TABLE IF NOT EXISTS user_info";
sqlstr += "(";
sqlstr +=
        "user_id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT 'Unique User ID',";
sqlstr +=
        "user_name VARCHAR(100) CHARACTER SET gb2312 COLLATE gb2312_chinese_ci NULL COMMENT 'Name Of User',";
sqlstr +=
        "user_second_sum INT UNSIGNED NOT NULL DEFAULT 0 COMMENT 'The Summation Of Using Time'";
sqlstr += ");";
if (0 == mysql_query(&mydata, sqlstr.c_str())) {
    cout << "mysql_query() create table succeed" << endl;
} else {
    cout << "mysql_query() create table failed" << endl;
    mysql_close(&mydata);
    return -1;
}


ifdef STEPBYSTEP

system("pause");

endif

//向表中插入數據
sqlstr =
        "INSERT INTO user_info(user_name) VALUES('公司名稱'),('一級部門'),('二級部門'),('開發小組'),('姓名');";
if (0 == mysql_query(&mydata, sqlstr.c_str())) {
    cout << "mysql_query() insert data succeed" << endl;
} else {
    cout << "mysql_query() insert data failed" << endl;
    mysql_close(&mydata);
    return -1;
}


ifdef STEPBYSTEP

system("pause");

endif

//顯示剛才插入的數據
sqlstr = "SELECT user_id,user_name,user_second_sum FROM user_info";
MYSQL_RES *result = NULL;
if (0 == mysql_query(&mydata, sqlstr.c_str())) {
    cout << "mysql_query() select data succeed" << endl;

    //一次性取得數據集
    result = mysql_store_result(&mydata);
    //取得并打印行數
    int rowcount = mysql_num_rows(result);
    cout << "row count: " << rowcount << endl;

    //取得并打印各字段的名稱
    unsigned int fieldcount = mysql_num_fields(result);
    MYSQL_FIELD *field = NULL;
    for (unsigned int i = 0; i < fieldcount; i++) {
        field = mysql_fetch_field_direct(result, i);
        cout << field->name << "\t\t";
    }
    cout << endl;

    //打印各行
    MYSQL_ROW row = NULL;
    row = mysql_fetch_row(result);
    while (NULL != row) {
        for (int i = 0; i < fieldcount; i++) {
            cout << row[i] << "\t\t";
        }
        cout << endl;
        row = mysql_fetch_row(result);
    }

} else {
    cout << "mysql_query() select data failed" << endl;
    mysql_close(&mydata);
    return -1;
}


ifdef STEPBYSTEP

system("pause");

endif

//刪除剛才建的表
sqlstr = "DROP TABLE user_info";
if (0 == mysql_query(&mydata, sqlstr.c_str())) {
    cout << "mysql_query() drop table succeed" << endl;
} else {
    cout << "mysql_query() drop table failed" << endl;
    mysql_close(&mydata);
    return -1;
}
mysql_free_result(result);
mysql_close(&mydata);
mysql_server_end();

system("pause");
return 0;

}
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