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  • 连接数据库的DBUtils工具类

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    
    public class DBUtils {
    	static{
    		try {
    			Class.forName("oracle.jdbc.driver.OracleDriver");
    		} catch (ClassNotFoundException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
    	public static Connection getConnection() throws SQLException{
    		String url = "jdbc:oracle:thin:@10.25.116.138:1521:orcl";
    		Connection conn = DriverManager.getConnection(url, "scott", "tiger");
    		return conn;
    	}
    	public static void close(PreparedStatement ps){
    		if(ps != null){
    			try {
    				ps.close();
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    	}
    	public static void close(ResultSet rs){
    		if(rs != null){
    			try {
    				rs.close();
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    	}
    	public static void close(Connection conn){
    		if(conn != null){
    			try {
    				conn.close();
    			} catch (SQLException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    		}
    	}
    	
    	public static void main(String[] args) {
    		
    		String answer = "";
    		try {
    			Connection conn = DBUtils.getConnection();
    			StringBuilder sql = new StringBuilder("select name from t_emp");
    			PreparedStatement ps = conn.prepareStatement(sql.toString());
    			ResultSet rs = ps.executeQuery();
    			while (rs.next()) {
    				answer += rs.getString("name");
    			}
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		System.out.println("answer = " + answer);
    	}
    }	
    

      

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  • 原文地址:https://www.cnblogs.com/E-star/p/3386687.html
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