日本综合一区二区|亚洲中文天堂综合|日韩欧美自拍一区|男女精品天堂一区|欧美自拍第6页亚洲成人精品一区|亚洲黄色天堂一区二区成人|超碰91偷拍第一页|日韩av夜夜嗨中文字幕|久久蜜综合视频官网|精美人妻一区二区三区

在C語言中，我們可以使用多種數(shù)據(jù)庫系統(tǒng)，如MySQL、SQLite、PostgreSQL等，這里以MySQL為例，介紹如何在C語言中編寫一個(gè)簡單的數(shù)據(jù)庫系統(tǒng)。

網(wǎng)站建設(shè)哪家好，找創(chuàng)新互聯(lián)！專注于網(wǎng)頁設(shè)計(jì)、網(wǎng)站建設(shè)、微信開發(fā)、小程序設(shè)計(jì)、集團(tuán)企業(yè)網(wǎng)站建設(shè)等服務(wù)項(xiàng)目。為回饋新老客戶創(chuàng)新互聯(lián)還提供了邵東免費(fèi)建站歡迎大家使用！

1、安裝MySQL庫

我們需要在C語言中安裝MySQL庫，在Linux系統(tǒng)中，可以使用以下命令安裝：

sudo aptget install libmysqlclientdev

在Windows系統(tǒng)中，可以從MySQL官網(wǎng)下載預(yù)編譯的庫文件，并將其添加到項(xiàng)目中。

2、包含頭文件和庫文件

在C語言源文件中，我們需要包含MySQL庫的頭文件和鏈接庫文件。

#include 
#include 
#include 

3、初始化MySQL連接

在使用MySQL庫之前，我們需要初始化一個(gè)MySQL連接，這需要提供數(shù)據(jù)庫服務(wù)器的地址、用戶名、密碼和數(shù)據(jù)庫名等信息。

MYSQL *conn;
conn = mysql_init(NULL);
if (conn == NULL) {
    fprintf(stderr, "mysql_init() failed
");
    exit(1);
}

4、連接到MySQL服務(wù)器

接下來，我們需要連接到MySQL服務(wù)器，這需要調(diào)用mysql_real_connect()函數(shù)，并傳入前面初始化的連接對象以及相關(guān)信息。

if (mysql_real_connect(conn, "localhost", "username", "password", "database", 0, NULL, 0) == NULL) {
    fprintf(stderr, "mysql_real_connect() failed: %s
", mysql_error(conn));
    mysql_close(conn);
    exit(1);
}

5、執(zhí)行SQL語句

連接到MySQL服務(wù)器后，我們可以執(zhí)行SQL語句來操作數(shù)據(jù)庫，創(chuàng)建一個(gè)名為test的表：

if (mysql_query(conn, "CREATE TABLE test (id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(255))")) {
    fprintf(stderr, "mysql_query() failed: %s
", mysql_error(conn));
    mysql_close(conn);
    exit(1);
}

插入一條數(shù)據(jù)：

if (mysql_query(conn, "INSERT INTO test (name) VALUES ('張三')")) {
    fprintf(stderr, "mysql_query() failed: %s
", mysql_error(conn));
    mysql_close(conn);
    exit(1);
}

查詢數(shù)據(jù)：

MYSQL_RES *result;
MYSQL_ROW row;
if (mysql_query(conn, "SELECT * FROM test")) {
    fprintf(stderr, "mysql_query() failed: %s
", mysql_error(conn));
    mysql_close(conn);
    exit(1);
}
result = mysql_store_result(conn);
num_rows = mysql_num_rows(result);
printf("查詢結(jié)果： %d行記錄 found.", num_rows);
while ((row = mysql_fetch_row(result))) {
    printf("%st%s
", row[0], row[1]);
}
mysql_free_result(result);

6、關(guān)閉MySQL連接

我們需要關(guān)閉MySQL連接，這可以通過調(diào)用mysql_close()函數(shù)來實(shí)現(xiàn)。

mysql_close(conn);

7、完整示例代碼：創(chuàng)建一個(gè)簡單的數(shù)據(jù)庫系統(tǒng)，實(shí)現(xiàn)創(chuàng)建表、插入數(shù)據(jù)和查詢數(shù)據(jù)的功能，注意將username、password和database替換為實(shí)際的MySQL用戶名、密碼和數(shù)據(jù)庫名，確保已安裝MySQL庫并正確配置項(xiàng)目，以下是完整的示例代碼：

#include 
#include 
#include 
#include  // for strlen() and strchr() functions in the next line of code. If not needed, you can remove this include statement. Replace all occurrences of "strlen" with "my_strlen" and "strchr" with "my_strchr". #include  // for strlen() and strchr() functions in the next line of code. If not needed, you can remove this include statement. Replace all occurrences of "strlen" with "my_strlen" and "strchr" with "my_strchr". // For Windows users, you can replace the above include statements with these ones: #include  #include  #include  #include  #include  #include  #include  #include  // You may need to download and install the Windows version of the MySQL Connector/C from https://dev.mysql.com/downloads/connector/c/ or use another method to get the required header files and libraries for Windows. // Note that you might need to modify some of the code and include additional header files depending on your specific setup and requirements. // For example, if you are using the Microsoft Visual Studio development environment, you might need to add the following line at the beginning of your source code file: #pragma comment(lib,"libmysql.lib") // This will link the required library dynamically at runtime when your application is executed under Windows operating system. // You can also statically link the required library by adding it to your project settings under Linker > General > Additional Library Directories option and adding its name to the Linker > General > Additional Library Files option in Microsoft Visual Studio development environment or similar tools used for building C applications on Windows operating system." int main() { // Your code goes here } return 0; } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goes here } // Your code goeshereint main() {MYSQL *conn;conn = mysql_init(NULL);if (conn == NULL) {fprintf(stderr, "mysql_init() failed
");exit(1);}if (mysql_real_connect(conn, "localhost", "username", "password", "database", 0, NULL, 0) == NULL) {fprintf(stderr, "mysql_real_connect() failed: %s
", mysql_error(conn));mysql_close(conn);exit(1);}}

分享文章：c語言怎么寫數(shù)據(jù)庫系統(tǒng)
URL分享：http://www.dlmjj.cn/article/cohcsjs.html