mysql example

applications/examples/mysqlexample/demo01.cpp

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+#include <mysql_driver.h>
+#include <mysql_connection.h>
+#include <cppconn/prepared_statement.h>
+#include <cppconn/resultset.h>
+#include <cppconn/statement.h>
+#include <cppconn/exception.h>
+#include <iostream>
+#include <string>
+#include <random>
+
+std::string generateRandomString(size_t length) 
+{
+    const std::string CHARACTERS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+
+    std::random_device dev;
+    std::mt19937 rng(dev());
+    std::uniform_int_distribution<> dist(0, CHARACTERS.size() - 1);
+
+    std::string random_string;
+    for (size_t i = 0; i < length; ++i) {
+        random_string += CHARACTERS[dist(rng)];
+    }
+
+    return random_string;
+}
+
+int main() 
+{
+    try 
+    {
+        // 数据库连接配置
+        std::string server = "tcp://127.0.0.1:3306";
+        std::string username = "root";
+        std::string password = "Hj57471000";
+        std::string database = "hjems";
+
+        // 创建连接
+        sql::mysql::MySQL_Driver *driver;
+        driver = sql::mysql::get_mysql_driver_instance();
+        std::unique_ptr< sql::Connection > con(driver->connect(server, username, password));
+
+        // 设置为使用指定数据库
+        con->setSchema(database);
+
+        // 准备SQL查询语句
+        //std::string sql = "SELECT uid, uname, upasswd, usalt, email, mobile1, mobile2, memo FROM tbl_user WHERE uid = ?";
+        std::string sql = "SELECT uid, uname, upasswd, usalt, email, mobile1, mobile2, memo FROM tbl_user WHERE uid LIKE ?";
+        
+        // 创建预编译的prepared statement
+        std::unique_ptr< sql::PreparedStatement > pstmt(con->prepareStatement(sql));
+
+        // 绑定参数
+        //pstmt->setString(1, "hkc"); // 替换为你要查询的用户名
+        
+        // 绑定参数，使用 '%' 作为通配符进行模糊匹配
+        // 例如，搜索以 'user' 开头的所有用户名
+        std::string pattern = "user%"; // 替换为你要查询的模式
+        pstmt->setString(1, pattern);
+
+        // 执行查询
+        std::unique_ptr< sql::ResultSet > res(pstmt->executeQuery());
+
+        // 处理结果集
+        while (res->next()) {
+            // 假设username和password都是字符串类型
+            std::string user = res->getString("uname");
+            std::string pass = res->getString("upasswd");
+            std::string usalt = res->getString("usalt");
+            std::string email = res->getString("email");
+            std::string mobile1 = res->getString("mobile1");
+            std::string mobile2 = res->getString("mobile2");
+            std::string memo = res->getString("memo");
+
+            std::cout << "Username: " << user << ", Password: " << pass << std::endl;
+            std::cout << "Salt: " << usalt << ", email: " << email << std::endl;
+            std::cout << "mobile1: " << mobile1 << ", mobile2: " << mobile2 << std::endl;
+            std::cout << "Memo: " << memo <<  std::endl;
+        }
+
+
+        // 插入新用户记录的 SQL 语句
+        std::string insertSql = "INSERT INTO tbl_user (uid, uname, upasswd, usalt,memo) VALUES (?, ?, ?,?,?)";
+
+        // 创建预编译的 prepared statement 对象
+        std::unique_ptr<sql::PreparedStatement> insertStmt(con->prepareStatement(insertSql));
+
+        // 绑定插入数据的参数
+        size_t passwordLength = 12; // 密码长度不超过12个字符
+        std::string newUid = generateRandomString(passwordLength);
+        //const std::string newUid = "new_uid"; // 替换为新用户的用户名
+        const std::string newSalt = "1C915F2C045EA7628E3CF170BFA59F51"; // 替换为新用户的密码
+        const std::string newUser = "new_username"; // 替换为新用户的用户名
+        const std::string newPassword = "new_password"; // 替换为新用户的密码
+        const std::string newMemo = "新备注信息";
+
+        insertStmt->setString(1, newUid);
+        insertStmt->setString(2, newUser);
+        insertStmt->setString(3, newPassword);
+        insertStmt->setString(4, newSalt);
+        insertStmt->setString(5, newMemo);
+        
+        // 执行插入操作
+        int rowsAffected = insertStmt->executeUpdate();
+
+        // 检查插入操作是否成功
+        if (rowsAffected > 0) 
+        {
+            std::cout << "New user inserted successfully." << std::endl;
+        } else {
+            std::cout << "No rows affected during insert operation." << std::endl;
+        }
+
+        // 关闭连接
+        con->close();
+    } 
+    catch (sql::SQLException &e) {
+        std::cerr << "SQLException: " << e.what();
+        std::cerr << " (MySQL error code: " << e.getErrorCode();
+        std::cerr << ", SQLState: " << e.getSQLState() << " )" << std::endl;
+    }
+
+    return 0;
+}