Postgre JDBC执行复杂SQL查询

要执行复杂的SQL查询，可以使用PostgreSQL的JDBC驱动程序来连接数据库并执行查询。以下是一个简单的示例代码，演示如何使用Java中的JDBC驱动程序执行一个复杂的SQL查询：

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

public class Main {
    public static void main(String[] args) {
        String url = "jdbc:postgresql://localhost:5432/mydatabase";
        String user = "myuser";
        String password = "mypassword";

        try (Connection conn = DriverManager.getConnection(url, user, password)) {
            String query = "SELECT * FROM mytable WHERE column1 = ? AND column2 = ?";
            PreparedStatement stmt = conn.prepareStatement(query);
            stmt.setString(1, "value1");
            stmt.setString(2, "value2");

            ResultSet rs = stmt.executeQuery();
            while (rs.next()) {
                //处理查询结果
                System.out.println(rs.getString("column1") + ", " + rs.getString("column2"));
            }
        } catch (SQLException e) {
            System.err.println("SQL Exception: " + e.getMessage());
        }
    }
}

    org.postgresql
    postgresql
    42.2.23

implementation 'org.postgresql:postgresql:42.2.23'