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
|
package bun
import (
"context"
"database/sql"
"reflect"
"sync/atomic"
"time"
"github.com/uptrace/bun/schema"
)
type QueryEvent struct {
DB *DB
QueryAppender schema.QueryAppender
Query string
QueryArgs []interface{}
StartTime time.Time
Result sql.Result
Err error
Stash map[interface{}]interface{}
}
type QueryHook interface {
BeforeQuery(context.Context, *QueryEvent) context.Context
AfterQuery(context.Context, *QueryEvent)
}
func (db *DB) beforeQuery(
ctx context.Context,
queryApp schema.QueryAppender,
query string,
queryArgs []interface{},
) (context.Context, *QueryEvent) {
atomic.AddUint64(&db.stats.Queries, 1)
if len(db.queryHooks) == 0 {
return ctx, nil
}
event := &QueryEvent{
DB: db,
QueryAppender: queryApp,
Query: query,
QueryArgs: queryArgs,
StartTime: time.Now(),
}
for _, hook := range db.queryHooks {
ctx = hook.BeforeQuery(ctx, event)
}
return ctx, event
}
func (db *DB) afterQuery(
ctx context.Context,
event *QueryEvent,
res sql.Result,
err error,
) {
switch err {
case nil, sql.ErrNoRows:
// nothing
default:
atomic.AddUint64(&db.stats.Errors, 1)
}
if event == nil {
return
}
event.Result = res
event.Err = err
db.afterQueryFromIndex(ctx, event, len(db.queryHooks)-1)
}
func (db *DB) afterQueryFromIndex(ctx context.Context, event *QueryEvent, hookIndex int) {
for ; hookIndex >= 0; hookIndex-- {
db.queryHooks[hookIndex].AfterQuery(ctx, event)
}
}
//------------------------------------------------------------------------------
func callBeforeScanHook(ctx context.Context, v reflect.Value) error {
return v.Interface().(schema.BeforeScanHook).BeforeScan(ctx)
}
func callAfterScanHook(ctx context.Context, v reflect.Value) error {
return v.Interface().(schema.AfterScanHook).AfterScan(ctx)
}
|
