go-sqlserver-storage/sqlserver_connection_manager.go at main · storage-lock/go-sqlserver-storage · GitHub

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
package sqlserver_storage

import (
	"context"
	"database/sql"
	"fmt"
	"sync"

	"github.com/storage-lock/go-storage"
)

const (
	DriverNameMsSql     = "mssql"
	DriverNameSqlServer = "sqlserver"
)

// SqlServerConnectionManager 负责管理与Sql Server服务器的连接
type SqlServerConnectionManager struct {

	// 主机的名字
	Host string

	// 主机的端口
	Port uint

	// 用户名
	User string

	// 密码
	Passwd string

	// DSN
	// Example: "sqlserver://sa:UeGqAm8CxYGldMDLoNNt@192.168.128.206:1433"
	DSN string

	driverName string

	// 初始化好的数据库实例
	db   *sql.DB
	err  error
	open func(string, string) (*sql.DB, error)
	once sync.Once
}

const SqlServerConnectionManagerName = "sql-server-connection-manager"

// SqlServerOpen 默认走 database/sql，测试可替换，避免示例必须连接真实数据库。
var SqlServerOpen = sql.Open

var _ storage.ConnectionManager[*sql.DB] = &SqlServerConnectionManager{}

// NewSqlServerConnectionManagerFromDsn 从DSN创建SqlServer连接
func NewSqlServerConnectionManagerFromDsn(dsn string) *SqlServerConnectionManager {
	return &SqlServerConnectionManager{
		DSN: dsn,
	}
}

func NewSqlServerConnectionManagerFromSqlDb(db *sql.DB) *SqlServerConnectionManager {
	return &SqlServerConnectionManager{
		db: db,
	}
}

// NewSqlServerConnectionManager 从服务器属性创建数据库连接
func NewSqlServerConnectionManager(host string, port uint, user, passwd string) *SqlServerConnectionManager {
	return &SqlServerConnectionManager{
		Host:   host,
		Port:   port,
		User:   user,
		Passwd: passwd,
	}
}

func (x *SqlServerConnectionManager) SetDriverName(driverName string) *SqlServerConnectionManager {
	x.driverName = driverName
	return x
}

func (x *SqlServerConnectionManager) Name() string {
	return SqlServerConnectionManagerName
}

func (x *SqlServerConnectionManager) GetDSN() string {
	if x.DSN != "" {
		return x.DSN
	}
	driverName := x.driverName
	if driverName == "" {
		driverName = DriverNameMsSql
	}
	return fmt.Sprintf("sqlserver://%s:%s@%s:%d", x.User, x.Passwd, x.Host, x.Port)
}

// Take 获取到数据库的连接
func (x *SqlServerConnectionManager) Take(ctx context.Context) (*sql.DB, error) {
	x.once.Do(func() {
		if x.db != nil {
			return
		}
		if x.err != nil {
			return
		}
		open := x.open
		if open == nil {
			open = SqlServerOpen
		}
		db, err := open(x.driverName, x.GetDSN())
		if err != nil {
			x.err = err
			return
		}
		x.db = db
	})
	return x.db, x.err
}

func (x *SqlServerConnectionManager) Return(ctx context.Context, connection *sql.DB) error {
	return nil
}

func (x *SqlServerConnectionManager) Shutdown(ctx context.Context) error {
	if x.db != nil {
		return x.db.Close()
	}
	return nil
}