db.java

来自「分销资源计划是管理企业的分销网络的系统」· Java 代码 · 共 92 行

package com.beifengkd.drp.util;
import java.sql.*;
public class DB {
	//连接数据库
	public static Connection getConn() {
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/drp?user=root&password=root");
		} catch(ClassNotFoundException e) {
			e.printStackTrace();
		} catch(SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}
	//Statement语句对象
	public static Statement createStatement(Connection conn) {
		Statement stmt = null;
		try {
			stmt = conn.createStatement();
		} catch(SQLException e) {
			e.printStackTrace();
		}
		return stmt;
	}
	//创建PreparedStatement语句对象
	public static PreparedStatement createPreparedStatement(Connection conn, String sql) {
		PreparedStatement pstmt = null;
		try {
			pstmt = conn.prepareStatement(sql);
		} catch(SQLException e) {
			e.printStackTrace();
		}
		return pstmt;
	}
	
	//重写PreparedStatement语句对象autoGeneratedKeys
	public static PreparedStatement createPreparedStatement(Connection conn, String sql, int autoGeneratedKeys) {
		PreparedStatement pstmt = null;
		try {
			pstmt = conn.prepareStatement(sql, autoGeneratedKeys);
		} catch(SQLException e) {
			e.printStackTrace();
		}
		return pstmt;
	}
	//创建结果集
	public static ResultSet executeQuery(Statement stmt, String sql) {
		ResultSet rs = null;
		try {
			rs = stmt.executeQuery(sql);
		} catch(SQLException e) {
			e.printStackTrace();
		}
		return rs;
	}
	//关闭连接
	public static void close(Connection conn) {
		try {
			if(conn != null) {
				conn.close();
				conn = null;
			}
		} catch(SQLException e) {
			e.printStackTrace();
		}
	}
	//关闭Statement
	public static void close(Statement stmt) {
		try {
			if(stmt != null) {
				stmt.close();
				stmt = null;
			}
		} catch(SQLException e) {
			e.printStackTrace();
		}
	}
	//关闭ResultSet
	public static void close(ResultSet rs) {
		try {
			if(rs != null) {
				rs.close();
				rs = null;
			}
		} catch(SQLException e) {
			e.printStackTrace();
		}
	}
}