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
|
package insync.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import insync.model.Contact;
public class ContactDAO extends BaseDAO
{
public List getContacts()
{
System.out.println("ContactDAO: findAll");
return getList("SELECT * FROM contact ORDER BY last_name, first_name");
}
public List getContactsByName(String name)
{
System.out.println("ContactDAO: findByName");
String likeStr = "%" + name + "%";
return getList("SELECT * FROM contact WHERE first_name LIKE ? OR last_name LIKE ? ORDER BY last_name, first_name",
new Object[] {likeStr, likeStr});
}
public List getContactsByCompany(int companyId)
{
System.out.println("ContactDAO: findByCompany");
return getList("SELECT * FROM contact WHERE company_id=? ORDER BY last_name, first_name", companyId);
}
public Object getContact(int contactId)
{
System.out.println("ContactDAO: getContact");
return getItem("SELECT * FROM contact WHERE contact_id=?", contactId);
}
public Contact create(Contact contact) throws DAOException
{
System.out.println("ContactDAO: create contact");
int contactId = createItem("INSERT INTO contact (first_name, last_name, phone, email, address, city, state, zip) VALUES (?,?,?,?,?,?,?,?)",
new Object[] {
contact.getFirstName(),
contact.getLastName(),
contact.getPhone(),
contact.getEmail(),
contact.getAddress(),
contact.getCity(),
contact.getState(),
contact.getZip()
});
contact.setId(contactId);
return contact;
}
public Contact save(Contact contact) throws DAOException, ConcurrencyException
{
System.out.println("ContactDAO: save contact");
return contact.getId() > 0 ? update(contact) : create(contact);
}
public Contact update(Contact contact) throws DAOException, ConcurrencyException
{
System.out.println("ContactDAO: update contact");
int rows = executeUpdate("UPDATE contact SET first_name=?, last_name=?, phone=?, email=?, address=?, city=?, state=?, zip=? WHERE contact_id=?",
new Object[] { contact.getFirstName(),
contact.getLastName(),
contact.getPhone(),
contact.getEmail(),
contact.getAddress(),
contact.getCity(),
contact.getState(),
contact.getZip(),
contact.getId()
});
if (rows == 0)
{
throw new ConcurrencyException("Item not found");
}
return (Contact) getContact(contact.getId());
}
public Contact update(Contact contact, Contact originalContact) throws DAOException, ConcurrencyException
{
System.out.println("ContactDAO: update contact");
/*
* The WHERE clause in this statement represents an optimistic locking implementation where
* your update will fail if the row has been changed by someone else since you read it.
* Another (simpler) way of implementing the same concurrency level without adding all the columns to the WHERE clause
* is to add a “version” column to the table. Every time the contact is updated, the contact's version is incremented.
* Using this approach, you can make sure a row has not been updated since you read it by building the WHERE clause
* using the primary key and the version column only.
*/
StringBuffer sql = new StringBuffer("UPDATE contact SET first_name=?, last_name=?, phone=?, email=?, address=?, city=?, state=?, zip=? ");
sql.append("WHERE contact_id=? ");
sql.append("AND (first_name=? or (? is null and first_name is null)) ");
sql.append("AND (last_name=? or (? is null and last_name is null)) ");
sql.append("AND (phone=? or (? is null and phone is null)) ");
sql.append("AND (email=? or (? is null and email is null)) ");
sql.append("AND (address=? or (? is null and address is null)) ");
sql.append("AND (city=? or (? is null and city is null)) ");
sql.append("AND (state=? or (? is null and state is null)) ");
sql.append("AND (zip=? or (? is null and zip is null))");
int rows = executeUpdate(sql.toString(), new Object[] {
contact.getFirstName(),
contact.getLastName(),
contact.getPhone(),
contact.getEmail(),
contact.getAddress(),
contact.getCity(),
contact.getState(),
contact.getZip(),
contact.getId(),
originalContact.getFirstName(),
originalContact.getFirstName(),
originalContact.getLastName(),
originalContact.getLastName(),
originalContact.getPhone(),
originalContact.getPhone(),
originalContact.getEmail(),
originalContact.getEmail(),
originalContact.getAddress(),
originalContact.getAddress(),
originalContact.getCity(),
originalContact.getCity(),
originalContact.getState(),
originalContact.getState(),
originalContact.getZip(),
originalContact.getZip()
});
if (rows == 0)
{
throw new ConcurrencyException("Item not found");
}
return (Contact) getContact(contact.getId());
}
public void deleteItem(Contact contact) throws DAOException, ConcurrencyException
{
System.out.println("ContactDAO: delete contact");
int rows = executeUpdate("DELETE FROM contact WHERE contact_id = ?", new Object[] { contact.getId() });
if (rows == 0)
{
throw new ConcurrencyException("Item not found");
}
}
protected Object rowToObject(ResultSet rs) throws SQLException
{
Contact contact = new Contact();
contact.setId(rs.getInt("contact_id"));
contact.setFirstName(rs.getString("first_name"));
contact.setLastName(rs.getString("last_name"));
contact.setPhone(rs.getString("phone"));
contact.setEmail(rs.getString("email"));
contact.setAddress(rs.getString("address"));
contact.setCity(rs.getString("city"));
contact.setState(rs.getString("state"));
contact.setZip(rs.getString("zip"));
return contact;
}
} |
Configuration de Flex et LiveCycle
Répondre avec citation
Partager