jdbc操作myqsl数据库模板代码

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jdbc

package cn.itcast.jdbc;

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

/**
 * 
 * 2008-12-6
 * 
 * @author <a href="mailto:liyongibm@hotmail.com">李勇</a>
 * 
 */
public final class JdbcUtils {
	private static String url = "jdbc:mysql://localhost:3306/jdbc";
	private static String user = "root";
	private static String password = "";

	private JdbcUtils() {
	}

	static {
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (Exception e) {
			throw new ExceptionInInitializerError(e);
		}
	}

	public static Connection getConnection() throws SQLException {
		return DriverManager.getConnection(url, user, password);
	}

	public static void free(ResultSet rs, Statement st, Connection conn) {
		try {
			if (rs != null)
				rs.close();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (st != null)
					st.close();
			} catch (SQLException e) {
				e.printStackTrace();
			} finally {
				if (conn != null)
					try {
						conn.close();
					} catch (Exception e) {
						e.printStackTrace();
					}
			}
		}
	}
}

package cn.itcast.jdbc;

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

/**
 * 
 * 2008-12-6
 * 
 * @author <a href="mailto:liyongibm@hotmail.com">李勇</a>
 * 
 */
public class Base {

	static void template() throws Exception {
		Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		try {
			// 2.建立连接
			conn = JdbcUtils.getConnection();
			// 3.创建语句
			st = conn.createStatement();

			// 4.执行语句
			rs = st.executeQuery("select * from user");

			// 5.处理结果
			while (rs.next()) {
				// 参数中的1,2,3,4是指sql中的列索引
				System.out.println(rs.getObject(1) + "\t" + rs.getObject(2)
						+ "\t" + rs.getObject(3) + "\t" + rs.getObject(4));
			}
		} finally {
			JdbcUtils.free(rs, st, conn);
		}

	}
}

crud

package cn.itcast.jdbc;

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

/**
 * 
 * 2008-12-6
 * 
 * @author <a href="mailto:liyongibm@hotmail.com">李勇</a>
 * 
 */
public class CRUD {

	/**
	 * @param args
	 * @throws SQLException
	 */
	public static void main(String[] args) throws SQLException {
		 create();
		//read();
		// update();
		// delete();
	}

	static void delete() throws SQLException {
		Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		try {
			// 2.建立连接
			conn = JdbcUtils.getConnection();
			// conn = JdbcUtilsSing.getInstance().getConnection();
			// 3.创建语句
			st = conn.createStatement();

			String sql = "delete from user where id>4";

			// 4.执行语句
			int i = st.executeUpdate(sql);

			System.out.println("i=" + i);
		} finally {
			JdbcUtils.free(rs, st, conn);
		}
	}

	static void update() throws SQLException {
		Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		try {
			// 2.建立连接
			conn = JdbcUtils.getConnection();
			// conn = JdbcUtilsSing.getInstance().getConnection();
			// 3.创建语句
			st = conn.createStatement();

			String sql = "update user set money=money+10 ";

			// 4.执行语句
			int i = st.executeUpdate(sql);

			System.out.println("i=" + i);
		} finally {
			JdbcUtils.free(rs, st, conn);
		}
	}

	static void create() throws SQLException {
		Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		try {
			// 2.建立连接
			conn = JdbcUtils.getConnection();
			// conn = JdbcUtilsSing.getInstance().getConnection();
			// 3.创建语句
			st = conn.createStatement();

			String sql = "insert into user(name,birthday, money) values ('name3', '1987-01-01', 600) ";

			// 4.执行语句
			int i = st.executeUpdate(sql);

			System.out.println("i=" + i);
		} finally {
			JdbcUtils.free(rs, st, conn);
		}
	}

	static void read() throws SQLException {
		Connection conn = null;
		Statement st = null;
		ResultSet rs = null;
		try {
			// 2.建立连接
			conn = JdbcUtils.getConnection();
			// conn = JdbcUtilsSing.getInstance().getConnection();
			// 3.创建语句
			st = conn.createStatement();

			// 4.执行语句
			rs = st.executeQuery("select id, name, money, birthday  from user");

			// 5.处理结果
			while (rs.next()) {
				System.out.println(rs.getObject("id") + "\t"
						+ rs.getObject("name") + "\t"
						+ rs.getObject("birthday") + "\t"
						+ rs.getObject("money"));
			}
		} finally {
			JdbcUtils.free(rs, st, conn);
		}
	}

}

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