SERVER에 CONTEXT.XML
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<?xml version="1.0" encoding="UTF-8"?>
<Context>
-->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<WatchedResource>${catalina.base}/conf/web.xml</WatchedResource>
<!-- dbcp 설정 (dataBase connection pool) -->
<Resource name="myDB" auth="Container" driverClassName="com.mysql.jdbc.Driver"
maxTotal="50" maxIdle="50" maxWaitMillis="-1"
url="jdbc:mysql://localhost:3306/java" username="java" password="java1234"
type="javax.sql.DataSource" />
</Context>
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cs |
BOOK DAO
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package book;
// jdbc import
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
public class BookDAO {
// db접속
public Connection dbConn() {
DataSource ds=null;
Connection conn=null;
try {
//context.xml을 분석하는 객체
Context ctx=new InitialContext();
//context.xml의 resource 태그 검색
ds =(DataSource)ctx.lookup("java:comp/env/myDB");
conn=ds.getConnection(); //커넥션을 할당받음
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
// db접속
/*public Connection dbConn() {
Connection conn = null; // db접속 객체
try {
// mysql jdbc driver 로딩
Class.forName("com.mysql.jdbc.Driver");
// db연결 문자열 but 이방법은 보안에 취약하다. ..
String url = "jdbc:mysql://localhost:3306/java";
String id = "java"; // mysql 접속아이디
String pwd = "java1234"; // mysql 접속 비번
// db 접속
conn = DriverManager.getConnection(url, id, pwd);
System.out.println("db접속 성공");
} catch (Exception e) {
// db관련작업은 반드시 익셉션 처리
System.out.println("db접속 실패");
e.printStackTrace();
}
return conn;
}*/
// 북리스트
public ArrayList<bookDTO> bookList() {
ArrayList<bookDTO> list = new ArrayList<bookDTO>();
Connection conn = null; // DB접속 객체
PreparedStatement pstmt = null; // SQL실행객체
ResultSet rs = null; // 결과셋 처리 객체
try {
conn = dbConn(); // db연결 키
String sql = "select * from book_table";
pstmt = conn.prepareStatement(sql); // sql을 실행시키는 객체 만들어짐
rs = pstmt.executeQuery(); // 실행 후 결과 값이 rs에 넘어옴
while (rs.next()) { // 결과셋.next(); 다음 레코드가 있으면 true
bookDTO dto = new bookDTO();
dto.setId(rs.getInt("id"));
dto.setTitle(rs.getString("title"));
dto.setAuthor(rs.getString("author"));
dto.setPrice(rs.getInt("price"));
dto.setQty(rs.getInt("qty"));
// ArrayList에 추가
list.add(dto);
}
} catch (Exception e) {
e.printStackTrace();
} finally { // 오픈한 역순으로 닫기작업 실행
// resultset= > statement=> connection
try {
if (rs != null) {
rs.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
try {
if (pstmt != null) {
pstmt.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return list;
}
//삽입
public void bookInsert(bookDTO dto) {
Connection conn = null; // DB접속 객체
PreparedStatement pstmt = null; // SQL실행객체
try{
conn=dbConn();
String sql="insert into book_table(title, author, price, qty)"+" values(?,?,?,?)";
//sql 실행객체 생성
pstmt=conn.prepareStatement(sql);
//? 에 입력될 값 매핑
pstmt.setString(1, dto.getTitle());
pstmt.setString(2, dto.getAuthor());
pstmt.setInt(3, dto.getPrice());
pstmt.setInt(4, dto.getQty());
//executeQuery() select 명령어
//executeUpdate select 이외 명령어
pstmt.executeUpdate();
}catch(Exception e){
e.printStackTrace();
}finally{
//리소스 정리작업
try {
if (pstmt != null) {
pstmt.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
try {
if (conn != null) {
conn.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
}
}
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cs |
