java json串保存mysql

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import org.json.JSONObject;

public class JsonToMySQL {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            // 创建表
            String createTableSQL = "CREATE TABLE IF NOT EXISTS mytable (id INT AUTO_INCREMENT PRIMARY KEY, data JSON)";
            conn.createStatement().execute(createTableSQL);

            // 插入JSON数据
            JSONObject jsonObject = new JSONObject();
            jsonObject.put("name", "John Doe");
            jsonObject.put("age", 30);
            jsonObject.put("email", "john.doe@example.com");

            String insertSQL = "INSERT INTO mytable (data) VALUES (?)";
            try (PreparedStatement pstmt = conn.prepareStatement(insertSQL)) {
                pstmt.setString(1, jsonObject.toString());
                pstmt.executeUpdate();
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import org.json.JSONObject;

public class QueryJsonFromMySQL {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String querySQL = "SELECT data FROM mytable WHERE id = 1";
            try (Statement stmt = conn.createStatement();
                 ResultSet rs = stmt.executeQuery(querySQL)) {
                if (rs.next()) {
                    String jsonString = rs.getString("data");
                    JSONObject jsonObject = new JSONObject(jsonString);
                    System.out.println("Name: " + jsonObject.getString("name"));
                    System.out.println("Age: " + jsonObject.getInt("age"));
                    System.out.println("Email: " + jsonObject.getString("email"));
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}