postgresql - 在 java 项目中定义串行数据类型

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class Main {
    public static void main(String[] args) {
        try {
            // 连接到PostgreSQL数据库
            Connection conn = DriverManager.getConnection("jdbc:postgresql://localhost:5432/mydatabase", "myuser", "mypassword");

            // 创建一个表格，其中包含一个名为"content"的text列
            String sql = "CREATE TABLE IF NOT EXISTS mytable (id SERIAL PRIMARY KEY, content TEXT)";
            PreparedStatement pstmt = conn.prepareStatement(sql);
            pstmt.executeUpdate();

            // 插入一条记录到表格中
            sql = "INSERT INTO mytable (content) VALUES (?)";
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, "Hello, world!");
            pstmt.executeUpdate();

            // 查询表格中的记录
            sql = "SELECT * FROM mytable";
            ResultSet rs = pstmt.executeQuery(sql);
            while (rs.next()) {
                int id = rs.getInt("id");
                String content = rs.getString("content");
                System.out.println("ID: " + id + ", Content: " + content);
            }

            // 关闭连接
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}