/
connect.go
153 lines (138 loc) · 3.15 KB
/
connect.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
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
package connect
import (
"database/sql"
"fmt"
_ "github.com/go-sql-driver/mysql"
"strconv"
// "math"
"reflect"
"strings"
"time"
)
type any = interface{}
type Result = map[string]any
type Results = []Result
// DataSourceName database source name
type DataSourceName struct {
Username string
Password string
Address string
Port int
}
func (dsn *DataSourceName) String() string {
s := make([]string, 0)
if dsn.Username != "" {
s = append(s, dsn.Username)
}
if dsn.Password != "" {
s = append(s, ":"+dsn.Password)
}
if dsn.Address != "" {
ad := dsn.Address
if dsn.Port != 0 {
ad = fmt.Sprintf("%s:%d", ad, dsn.Port)
}
s = append(s, "@tcp("+ad+")")
}
return strings.Join(s, "") + "/"
}
// Connect a database connection
type Connect struct {
db *sql.DB
isClose bool
}
func newConnect(db *sql.DB) *Connect {
return &Connect{db, db != nil && db.Ping() != nil}
}
// NewConnection connect to a exist database
func NewConnection(dsn *DataSourceName) (conn *Connect, err error) {
db, err := sql.Open("mysql", dsn.String())
conn = newConnect(db)
return
}
// Close the database connects
func (conn *Connect) Close() (err error) {
if !conn.isClose {
err = conn.db.Close()
if err == nil {
conn.isClose = true
}
}
return
}
// Query the data according the sql string
func (conn *Connect) Query(sqlStr string, args ...any) (result Results, err error) {
if conn.isClose {
err = fmt.Errorf("Database connect is closed")
return
}
rows, err := conn.db.Query(sqlStr, args...)
if err != nil {
return
}
result = make(Results, 0)
types, err := rows.ColumnTypes()
if err != nil {
return
}
for rows.Next() {
col := make(Result)
tmp := make([]any, len(types))
for idx := range tmp {
tmp[idx] = &tmp[idx]
}
err = rows.Scan(tmp...)
if err != nil {
return
}
for idx, value := range tmp {
transferType(col, types[idx], value)
}
result = append(result, col)
}
rows.Close()
return
}
func transferType(m Result, t *sql.ColumnType, value any) {
name := t.Name()
switch value.(type) {
case int, uint16, uint32, uint64, int8, int16, int32, int64, string, byte:
m[name] = value
return
default:
if value == nil {
m[name] = value
return
}
}
switch t.DatabaseTypeName() {
case "VARCHAR", "TEXT":
m[name] = string(value.([]byte))
case "INT":
n, _ := strconv.ParseInt(string(value.([]byte)), 10, 32)
m[name] = int32(n)
case "BIGINT":
n, _ := strconv.ParseInt(string(value.([]byte)), 10, 64)
m[name] = int64(n)
case "SMALLINT":
n, _ := strconv.ParseInt(string(value.([]byte)), 10, 16)
m[name] = int16(n)
case "TINYINT":
n, _ := strconv.ParseInt(string(value.([]byte)), 10, 8)
m[name] = int8(n)
case "BIT":
m[name] = value.([]byte)[0]
case "DATE":
m[name], _ = time.Parse("2006-01-02", string(value.([]byte)))
case "DATETIME":
m[name], _ = time.Parse("2006-01-02 15:04:05", string(value.([]byte)))
case "DOUBLE", "DECIMAL":
m[name], _ = strconv.ParseFloat(string(value.([]byte)), 64)
case "FLOAT":
f64, _ := strconv.ParseFloat(string(value.([]byte)), 32)
m[name] = float32(f64)
default:
fmt.Println(t.DatabaseTypeName(), reflect.TypeOf(value).Name(), value)
m[name] = value
}
}