Oracle分页查询emp表，已知：pageSize=6,查询第2页。（用java代码实现）

假设emp表结构如下：

| emp_id | emp_name | emp_salary |
| ------ | -------- | ---------- |
| 1 | Tom | 5000 |
| 2 | Jack | 6000 |
| 3 | Lucy | 7000 |
| 4 | Mike | 8000 |
| 5 | Mary | 9000 |
| 6 | John | 10000 |
| 7 | Anna | 11000 |
| 8 | Bob | 12000 |
| 9 | Kate | 13000 |
| 10 | David | 14000 |

Java代码实现：

import java.sql.*;

public class EmpQuery {
    public static void main(String[] args) throws SQLException {
        int pageSize = 6; // 每页显示记录数
        int pageNum = 2;  // 查询第2页
        
        Connection conn = null;
        PreparedStatement pstmt = null;
        ResultSet rs = null;
        
        try {
            // 加载数据库驱动
            Class.forName("oracle.jdbc.driver.OracleDriver");
            
            // 获取数据库连接
            conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "username", "password");
            
            // 构造SQL语句
            String sql = "SELECT * FROM (SELECT ROWNUM AS rn, emp_id, emp_name, emp_salary FROM emp) WHERE rn > ? AND rn <= ?";
            
            // 创建PreparedStatement对象
            pstmt = conn.prepareStatement(sql);
            
            // 设置参数
            int start = (pageNum - 1) * pageSize;
            pstmt.setInt(1, start);
            pstmt.setInt(2, start + pageSize);
            
            // 执行查询，并返回结果集
            rs = pstmt.executeQuery();
            
            // 遍历结果集，输出查询结果
            while (rs.next()) {
                int empId = rs.getInt("emp_id");
                String empName = rs.getString("emp_name");
                double empSalary = rs.getDouble("emp_salary");
                System.out.println(empId + "\t" + empName + "\t" + empSalary);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 释放资源
            if (rs != null) {
                rs.close();
            }
            if (pstmt != null) {
                pstmt.close();
            }
            if (conn != null) {
                conn.close();
            }
        }
    }
}

输出结果：

7	Anna	11000.0
8	Bob	12000.0
9	Kate	13000.0
10	David	14000.0