笨蛋学C++之 C++对数据库实现CRUD

本文主要是介绍笨蛋学C++之 C++对数据库实现CRUD，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

头文件

testcrud.h

#pragma once
#include <mysql.h>
#include <iostream>
#include <vector>
#include <cstring> // 包含字符串操作相关的头文件
using namespace std;typedef struct Test {int id;string name;Test(){}// 添加一个构造函数Test(int id, string name){this->id = id;this->name = name;}
}Test;class testCrud{testCrud();~testCrud();
public://创建单例模式static testCrud* getInstance() {static testCrud instance; // 创建一个静态实例return &instance;        // 返回这个静态实例的地址}
public:bool test_insert(Test &test);bool test_update(Test& test);bool test_delete(Test& test);vector<Test> test_select(string condition = "");private:MYSQL* con;const char* host = "127.0.0.1";const char* user = "root";const char* password = "数据库密码";const char* database_name = "数据库名";const int port = 3306;
};

源文件

testcrud.cpp

#include <iostream>
#include "test-crud.h"
using namespace std;testCrud::testCrud() {// 设置链接con = mysql_init(NULL);// 设置编码mysql_options(con, MYSQL_SET_CHARSET_NAME, "GBK");// 声明链接if (!mysql_real_connect(con, host, user, password, database_name, port, NULL, 0)) {cerr << "Failed to connect to database Error: " << mysql_error(con) << endl;exit(1);}
}
testCrud::~testCrud() {//关闭连接mysql_close(con);}//插入
bool testCrud::test_insert(Test& test) {char sql[1024];sprintf_s(sql, sizeof(sql), "INSERT INTO test (id,name) VALUES (%d,'%s')", test.id, test.name.c_str());if (mysql_query(con, sql)) {cerr << "Failed to insert to database Error: " << mysql_error(con) << endl;return false;}return true;
}
//修改
bool testCrud::test_update(Test& test) {char sql[1024];sprintf_s(sql, sizeof(sql), "UPDATE test SET name = '%s' WHERE id = %d", test.name.c_str(),test.id);if (mysql_query(con, sql)) {cerr << "Failed to update to database Error: " << mysql_error(con) << endl;return false;}return true;
}
//删除
bool testCrud::test_delete(Test& test) {char sql[1024];sprintf_s(sql, sizeof(sql), "DELETE FROM test WHERE id = %d",test.id);if (mysql_query(con, sql)) {cerr << "Failed to delete to database Error: " << mysql_error(con) << endl;return false;}return true;
}
//查询
vector<Test> testCrud::test_select(string condition) {vector<Test> testList;char sql[1024];//若condition为空，查出所有的数据sprintf_s(sql, sizeof(sql), "SELECT * FROM test %s", condition.c_str());if (mysql_query(con, sql)) {cerr << "Failed to select to database Error: " << mysql_error(con) << endl;return {};}MYSQL_RES* res = mysql_store_result(con);MYSQL_ROW row;while ((row = mysql_fetch_row(res))) {Test test;test.id = atoi(row[0]);test.name = atoi(row[1]);testList.push_back(test);}return vector<Test>();
}

main.cpp

#include <mysql.h>
#include <iostream>
#include <cstring> // 包含字符串操作相关的头文件#include "test-crud.h"
using namespace std;int main(void) {Test test(4, "王九");testCrud::getInstance()->test_update(test); // 调用 update_test 方法return 0;
}

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