-
Notifications
You must be signed in to change notification settings - Fork 0
/
chat.go
120 lines (97 loc) · 2.61 KB
/
chat.go
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
package chat
import (
"database/sql"
"fmt"
"time"
_ "github.com/mattn/go-sqlite3"
)
type Message struct {
Id int64 `json:"id,omitempty"`
Sender string `json:"sender,omitempty"`
SentTime time.Time `json:"sentTime,omitempty"`
Text string `json:"text,omitempty"`
}
func (mess *Message) ID() int64 {
return mess.Id
}
type Chat struct {
db *sql.DB
}
const dbFilePath = "./chat.db"
func NewChat() (*Chat, error) {
db, err := sql.Open("sqlite3", dbFilePath)
if err != nil {
return nil, fmt.Errorf("error while opening the database: %v", err)
}
_, err = db.Exec(createChatTable)
if err != nil {
return nil, fmt.Errorf("error while creating chat table: %v", err)
}
return &Chat{db: db}, nil
}
func (c *Chat) All() ([]*Message, error) {
rows, err := c.db.Query(getAllMessagesFromChat)
if err != nil {
return nil, fmt.Errorf("error while executing query in All: %v", err)
}
messages := make([]*Message, 0)
for rows.Next() {
var id int64
var sender string
var sentTime time.Time
var text string
if err := rows.Scan(&id, &sender, &sentTime, &text); err != nil {
return nil, fmt.Errorf("error while scanning a row in All: %v", err)
}
messages = append(messages, &Message{
Id: id,
Sender: sender,
SentTime: sentTime,
Text: text,
})
}
return messages, nil
}
func (c *Chat) Item(ID int64) (*Message, error) {
row := c.db.QueryRow(getMessageFromChat, ID)
var id int64
var sender string
var sentTime time.Time
var text string
if err := row.Scan(&id, &sender, &sentTime, &text); err != nil {
return nil, fmt.Errorf("error while scanning the row in Item: %v", err)
}
return &Message{
Id: id,
Sender: sender,
SentTime: sentTime,
Text: text,
}, nil
}
func (c *Chat) Create(mess *Message) (*Message, error) {
res, err := c.db.Exec(insertMessageIntoChat, mess.Sender, mess.SentTime, mess.Text)
if err != nil {
return nil, fmt.Errorf("error while inserting the message in Create: %v", err)
}
// It's IMPORTANT to set the ID of the message before returning it
id, err := res.LastInsertId()
if err != nil {
return nil, fmt.Errorf("error while retreiving the last id in Create: %v", err)
}
mess.Id = id
return mess, nil
}
func (c *Chat) Update(mess *Message) error {
_, err := c.db.Exec(updateMessageInChat, mess.Text, mess.Id)
if err != nil {
return fmt.Errorf("error while updating the message in Update: %v", err)
}
return nil
}
func (c *Chat) Delete(ID int64) error {
_, err := c.db.Exec(deleteMessageFromChat, ID)
if err != nil {
return fmt.Errorf("error while deleting the message in Delete: %v", err)
}
return nil
}