基本的JDBC连接数据库

最近整理一下以前使用的java连接数据库的方法，先是采用Properties文件链接SQL Server数据库。

 

数据库连接类：DBUtil.java

package com.jdbc.jdbcConnection;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

	/**
	 * 使用Properties 的方式加载数据库连接文件
	 * 
	 *  version 1.0
	 *  @author zjc
	 *  @since 1.0
	 */
public class DBUtil {

	private final static Properties props = new Properties();

	static {
		InputStream input = DBUtil.class.getClassLoader().getResourceAsStream("jdbc.properties");
		try {
			props.load(input);

			Class.forName(props.getProperty("driverClass"));

		} catch (IOException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}
	String url = props.getProperty("url");
	String user = props.getProperty("user");
	String password = props.getProperty("password");
	Connection conn = null;
	Statement stmt = null;
	PreparedStatement pst = null;
	ResultSet rs = null;

	public Connection getConnection() {

		try {
			conn = DriverManager.getConnection(url, user, password);
			return conn;
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
	}

	public Statement getStatement() {
		getConnection();
		try {
			stmt = conn.createStatement();

		} catch (SQLException e) {
			e.printStackTrace();
		}
		return stmt;

	}

	public PreparedStatement getPreparedStatement(String sql) {
		getConnection();
		try {
			pst = conn.prepareStatement(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return pst;
	}

	public ResultSet getReslutSet(String sql) {

		getStatement();
		try {
			rs = stmt.executeQuery(sql);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return rs;
	}
	public boolean update(String sql){
		
		getStatement();
		boolean flag = false;
		try {
			 stmt.execute(sql);
			 flag = true;
			 
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return flag;
	}

	public void close() {

		if (rs != null) {
			try {
				rs.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if (stmt != null) {
			try {
				stmt.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if (pst != null) {
			try {
				pst.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}

	}

}

资源文件：jdbc.properties

driverClass=net.sourceforge.jtds.jdbc.Driver
url=jdbc:jtds:sqlserver://127.0.0.1:1433/db
user=username
password=password

 

将jdbc.properties 放到项目src下，配置成功。