java-jdbc-select例子

 

package com.test.t;

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

public class TestJdbc {
	public static void main(String[] args) {
		Connection conn = null;
		Statement stmt = null;
		ResultSet rs = null;
		try {
			Class.forName("oracle.jdbc.driver.OracleDriver");
			//new oracle.jdbc.driver.OracleDriver();效果一样

			conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:orcl","scott","tiger");
			stmt = conn.createStatement();
			String sql = "select * from dept";
			rs = stmt.executeQuery(sql);
			
			while(rs.next()) {
				System.out.println(rs.getString("deptno"));
			}
		} catch(ClassNotFoundException e) { //class.forName会抛
			e.printStackTrace();
		} catch(SQLException e) {
			e.printStackTrace();
		} finally {
			try{ 	//关闭各种连接
				if(rs != null){
					rs.close();
					rs = null;
				}
				
				if(stmt != null) {
					stmt.close();
					stmt = null;
				}
				
				if(conn != null) {
					conn.close();
					conn = null;
				}
			} catch(SQLException e) {
				e.printStackTrace();
			}
			
		}
	}
}