2025-02-06

2025-02-06 22:43:19 +08:00
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+### 1.创建项目
+
+<img src="https://yp.smallkun.cn/markdown/image-20241222165137489.png!compress" alt="image-20241222165137489" style="zoom:50%;" />
+
+创建项目时选择空项目
+
+### 2.配置输出控制台
+
+<img src="https://yp.smallkun.cn/markdown/image-20241222165231278.png!compress" alt="image-20241222165231278" style="zoom:50%;" />
+
+右键项目名称选择`属性`
+
+配置属性->链接器->系统->子系统设置为`控制台 (/SUBSYSTEM:CONSOLE)`
+
+<img src="https://yp.smallkun.cn/markdown/image-20241222165309647.png!compress" alt="image-20241222165309647" style="zoom:50%;" />
+
+### 3.安装连接软件
+
+- 64位编译器选择**Windows (x86, 64-bit), ZIP Archive**(mysql-connector-c-6.1.11-winx64.zip)
+- 32位编译器选择**Windows (x86, 32-bit), ZIP Archive**(mysql-connector-c-6.1.11-win32.zip)
+
+https://downloads.mysql.com/archives/c-c/?version=6.1.11&amp;os=src
+
+![image-20240518184737189](https://yp.smallkun.cn/markdown/image-20240518184737189.png!compress!compress)
+
+安装完后会在C:\Program Files (x86)\MySQL\MySQL Connector C 6.1目录下
+
+### 4.配置头文件和lib文件
+
+**配置头文件路径**
+
+C:\Program Files (x86)\MySQL\MySQL Connector C 6.1\include
+
+右键项目名称点击属性 找到 配置属性下的VC++目录 将上述路径加入到`包含目录`下
+
+
+
+<img src="https://yp.smallkun.cn/markdown/image-20241222170322231.png!compress" alt="image-20241222170322231" style="zoom:50%;" />
+
+点击最右侧下拉框后点击编辑
+
+![image-20241222170447324](https://yp.smallkun.cn/markdown/image-20241222170447324.png!compress)
+
+**配置lib文件路径**
+
+C:\Program Files (x86)\MySQL\MySQL Connector C 6.1\lib
+
+右键项目名称点击属性 找到 配置属性->链接器->常规 将上述路径加入到`附加库目录`下
+
+<img src="https://yp.smallkun.cn/markdown/image-20241222170720851.png!compress" alt="image-20241222170720851" style="zoom:50%;" />
+
+**配置附加依赖性**
+
+配置属性——>链接器——>输入——>附加依赖项
+
+<img src="https://yp.smallkun.cn/markdown/image-20241222170820644.png!compress" alt="image-20241222170820644" style="zoom:50%;" />
+
+在其中加入`libmysql.lib`
+
+<img src="https://yp.smallkun.cn/markdown/image-20241222171057161.png!compress" alt="image-20241222171057161" style="zoom:50%;" />
+
+### 5.编写数据库连接代码
+
+```c
+#include <stdio.h>
+#include <stdlib.h>
+#include <mysql.h>
+
+
+void init_conn(MYSQL* mysql) {
+    mysql_init(mysql); // 初始化 MySQL 连接
+    if (!mysql_real_connect(mysql, "localhost", "root", "root", "user", 3306, NULL, CLIENT_IGNORE_SIGPIPE)) {
+        printf("连接数据库时发生错误!\n");
+        printf("%s\n", mysql_error(mysql));
+	}else{
+		printf("连接成功!\n");
+	}
+}
+int main(void){
+	MYSQL mysql;
+    int ret = 0;
+
+    init_conn(&mysql);
+
+	return 0;
+}
+```
+
+### 6.配置my.ini
+
+运行代码后会发现
+
+<img src="https://yp.smallkun.cn/markdown/image-20240518190612777.png!compress!compress" alt="image-20240518190612777" style="zoom:50%;" />
+
+要永久地关闭 MySQL 中的 SSL 连接功能，需要进行以下步骤：
+
+编辑 MySQL 配置文件 my.cnf（或 my.ini），一般位于 MySQL 安装目录的 /etc 或 /etc/mysql 子目录下。
+
+并添加以下配置： 
+
+Windows下此文件路径在C:\ProgramData\MySQL\MySQL Server 5.7\my.ini
+
+```ini
+ssl=0
+```
+
+1. 保存文件并退出编辑器。 
+2. 重启 MySQL 服务。
+
+
+
+**测试连接**
+
+![image-20241222171136732](https://yp.smallkun.cn/markdown/image-20241222171136732.png!compress)
+
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "mysql_utils.h"
+
+/*
+DBConnection *db_init(const char *host, const char *user, const char *password, const char *database, unsigned int port)
+
+void db_close(DBConnection *db)
+
+int db_common(DBConnection *db, const char *query)
+
+MYSQL_RES *db_query(DBConnection *db, const char *query)
+
+void process_result(MYSQL_RES *result)
+*/
+void clearUser(DBConnection *db){
+	db_common(db, "TRUNCATE users");
+	printf("Çå¿Õ³É¹¦!!! \n");
+}
+
+int addUser(DBConnection *db, char *username, char *password){
+	char sql[100];
+	sprintf(sql, "INSERT INTO users() VALUES(DEFAULT, \"%s\", \"%s\")", username, password);
+	printf("%s\n", sql);
+	return db_common(db, sql);
+}
+
+int main(void){
+	DBConnection *conn;
+
+    conn = db_init("localhost", "root", "root", "user", 3306);
+	
+	//process_result(db_query(conn, "SELECT * FROM users"));
+
+	printf("%d\n", addUser(conn, "root", "root"));
+
+	return 0;
+}
@@ -0,0 +1,108 @@
+#ifndef MYSQL_H
+#include <mysql.h>
+#endif
+
+#ifndef STDIO_H
+#include <stdio.h>
+#endif
+
+#ifndef STDLIB_H
+#include <stdlib.h>
+#endif
+
+#ifndef STRING_H
+#include <string.h>
+#endif
+
+//对MySQL连接指针变量 创建结构体变量并取别名
+typedef struct {
+    MYSQL *conn;
+} DBConnection;
+
+DBConnection *db_init(const char *host, const char *user, const char *password, const char *database, unsigned int port) {
+	//动态内存分配连接的地址
+    DBConnection *db = (DBConnection *)malloc(sizeof(DBConnection));
+    if (db == NULL) {
+        printf("内存分配错误\n");
+        return NULL;
+    }
+
+	//对连接地址进行动态内存分配
+    db->conn = mysql_init(NULL);
+    if (db->conn == NULL) {
+        printf("初始化失败\n");
+        free(db);
+        return NULL;
+    }
+
+	//对连接地址进行配置
+    if (mysql_real_connect(db->conn, host, user, password, database, port, NULL, 0) == NULL) {
+        printf("配置连接失败: %s\n", mysql_error(db->conn));
+        mysql_close(db->conn);
+        free(db);
+        return NULL;
+    }
+	mysql_set_character_set(db->conn, "GBK");//设置输入输出结果字符串为GBK
+    return db;
+}
+
+//关闭连接函数
+void db_close(DBConnection *db) {
+    if (db != NULL) {
+        if (db->conn != NULL) {
+            mysql_close(db->conn);
+        }
+        free(db);
+    }
+}
+
+//更新、删除、新增 通用函数
+int db_common(DBConnection *db, const char *query) {
+    if (mysql_query(db->conn, query)) {
+        printf("common query failed: %s\n", mysql_error(db->conn));
+        return 0;
+    }
+	if (strncmp(query, "INSERT", 6) == 0) {
+        return (int)mysql_insert_id(db->conn);
+    }
+
+    return (int)mysql_affected_rows(db->conn);
+}
+
+//查询通用函数
+MYSQL_RES *db_query(DBConnection *db, const char *query) {
+	MYSQL_RES *result;
+    if (mysql_query(db->conn, query)) {
+        printf("查询失败: %s\n", mysql_error(db->conn));
+        return NULL;
+    }
+
+    result = mysql_store_result(db->conn);
+    if (result == NULL) {
+        printf("获取查询结果失败: %s\n", mysql_error(db->conn));
+    }
+
+    return result;
+}
+
+//处理查询结果函数
+void process_result(MYSQL_RES *result) {
+	MYSQL_ROW row;
+	unsigned int num_fields;
+	unsigned int i;
+
+    if (result == NULL) {
+        fprintf(stderr, "Result set is NULL.\n");
+        return;
+    }
+    
+	//获取字段数
+    num_fields = mysql_num_fields(result);
+
+    while ((row = mysql_fetch_row(result))) {
+        for (i = 0; i < num_fields; i++) {
+            printf("%s\t", row[i] ? row[i] : "NULL");
+        }
+        printf("\n");
+    }
+}