database.java

来自「客运售票管理信息系统」· Java 代码 · 共 111 行

package passengertransportmis;

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


public class Database {
	
	public static Connection getConn(){
		Connection conn = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/passengertransport_mis", "root", "root");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}
	
	public static Statement createStmt(Connection conn){
		Statement stmt = null;
		try {
			stmt = conn.createStatement();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return stmt;
	}	
	
	public static PreparedStatement createPstmt(Connection conn, String sql){
		PreparedStatement pstmt = null;
		try {
			pstmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return pstmt;		
	}	
	
	public static ResultSet executeQuery(Statement stmt, String sql){
		ResultSet rs = null;
		try {
			rs = stmt.executeQuery(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return rs;
	}
	
	public static int executeUpdate(Statement stmt, String sql){
		int ret = 0;
		try {
			ret = stmt.executeUpdate(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return ret;
	}
	
	public static void close(Connection conn){
		if(conn != null){
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			conn = null;
		}
	}
	
	public static void close(Statement stmt){
		if(stmt != null){
			try {
				stmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			stmt = null;
		}
	}

	public static void close(PreparedStatement pstmt){
		if(pstmt != null){
			try {
				pstmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			pstmt = null;
		}
	}
	
	public static void close(ResultSet rs){
		if(rs != null){
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
			rs = null;
		}
	}
	
}