89 lines
2.7 KiB
Java
89 lines
2.7 KiB
Java
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package com.dao;
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import java.sql.*;
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import javax.sql.*;
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import javax.naming.*;
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import com.demo.BookBean;
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public class BookDao {
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private static InitialContext context = null;
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private DataSource dataSource = null;
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public BookDao() {
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try {
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if (context == null) {
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context = new InitialContext();
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}
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dataSource = (DataSource)context.lookup("java:comp/env/jdbc/demo");
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} catch (NamingException e) {
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e.printStackTrace();
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}
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}
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// 根据书号查询图书信息
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public BookBean searchBook(String bookid) {
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Connection dbconn = null;
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PreparedStatement pstmt = null;
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ResultSet rst = null;
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BookBean book = new BookBean();
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try {
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dbconn = dataSource.getConnection();
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pstmt = dbconn.prepareStatement("SELECT * FROM books WHERE bookid=?");
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pstmt.setString(1, bookid);
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rst = pstmt.executeQuery();
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if (rst.next()) {
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book.setBookid(rst.getString("bookid"));
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book.setTitle(rst.getString("title"));
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book.setAuthor(rst.getString("author"));
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book.setPublisher(rst.getString("publisher"));
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book.setPrice(rst.getDouble("price"));
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return book;
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} else {
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return null;
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}
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} catch (SQLException se) {
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se.printStackTrace();
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return null;
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} finally {
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try {
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if (rst != null) rst.close();
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if (pstmt != null) pstmt.close();
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if (dbconn != null) dbconn.close();
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} catch (SQLException se) {
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se.printStackTrace();
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}
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}
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}
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// 插入一本图书记录
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public boolean insertBook(BookBean book) {
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Connection dbconn = null;
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PreparedStatement pstmt = null;
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try {
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dbconn = dataSource.getConnection();
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pstmt = dbconn.prepareStatement("INSERT INTO books VALUES(?,?,?,?,?)");
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pstmt.setString(1, book.getBookid());
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pstmt.setString(2, book.getTitle());
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pstmt.setString(3, book.getAuthor());
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pstmt.setString(4, book.getPublisher());
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pstmt.setDouble(5, book.getPrice());
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int result = pstmt.executeUpdate();
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return result > 0;
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} catch (SQLException se) {
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se.printStackTrace();
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return false;
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} finally {
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try {
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if (pstmt != null) pstmt.close();
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if (dbconn != null) dbconn.close();
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} catch (SQLException se) {
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se.printStackTrace();
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}
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}
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}
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}
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