메뉴 건너뛰기

2021.03.27 20:51

JSP - DBCP 커넥션 풀

조회 수 873 추천 수 0 댓글 0
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄 첨부
?

단축키

Prev이전 문서

Next다음 문서

크게 작게 위로 아래로 댓글로 가기 인쇄 첨부

 

 
 
 
 
 
 
 
SERVER에 CONTEXT.XML 
 
 
 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
<?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>
cs

 

 

BOOK DAO

 

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
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();
            }
 
            
        }
        
    }
 
}
 
cs


 


하단 정보를 입력할 수 있습니다

© k2s0o1d4e0s2i1g5n. All Rights Reserved