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
|
package model
import (
"database/sql"
"embed"
"log"
_ "github.com/mattn/go-sqlite3"
)
var db *sql.DB
//go:embed sql/*.sql
var sqlCode embed.FS
func GetSql(code string) (string, error) {
query, err := sqlCode.ReadFile("sql/" + code + ".sql")
if err != nil {
return "", err
}
return string(query), nil
}
func ConnectDatabase(path string) {
var err error
db, err = sql.Open("sqlite3", path)
if err != nil {
log.Fatal(err)
}
err = db.Ping()
if err != nil {
log.Fatal(err)
}
}
func Transaction(f func(*sql.Tx) error) error {
tx, err := db.Begin()
if err != nil {
log.Printf("Failed to start database transaction: %v", err)
return err
}
defer func() {
if tx.Rollback() == nil {
log.Println("Rolled back transaction")
}
}()
err = f(tx)
if err != nil {
log.Printf("Failed transaction: %v", err)
return err
}
return tx.Commit()
}
func isDatabaseEmpty(tx *sql.Tx) bool {
cmd := `SELECT COUNT(*) FROM sqlite_master WHERE type='table'`
rows, err := tx.Query(cmd)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
if !rows.Next() {
log.Fatalf("No rows on request of database table number")
}
var number int
err = rows.Scan(&number)
if err != nil {
log.Fatalf("Failed to scan number of database tables to integer")
}
return number == 0
}
func MigrateDatabase() {
err := Transaction(func(tx *sql.Tx) error {
if isDatabaseEmpty(tx) {
log.Println("Starting with empty database")
}
query, err := GetSql(`migrate`)
if err != nil {
log.Fatal(err)
}
_, err = tx.Exec(query)
if err != nil {
return err
}
return nil
})
if err != nil {
log.Fatalf("Fatal: Database migration failed")
}
}
func InjectTestRecipes() {
Transaction(func(tx *sql.Tx) error {
recipes := RecipeTestData()
for _, recipe := range recipes {
err := recipe.Create(tx)
if err != nil {
return err
}
}
return nil
})
}
func DisconnectDatabase() {
var err error = db.Close()
if err != nil {
log.Printf("Failed to close database: %v\n", err)
} else {
log.Println("Closed database")
}
}
|
