/
dbtools.go
326 lines (276 loc) · 8.36 KB
/
dbtools.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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
package main
import(
"database/sql"
"reflect"
_ "github.com/go-sql-driver/mysql"
"github.com/davecgh/go-spew/spew"
"fmt"
"errors"
"strconv"
"encoding/hex"
)
func init() {
_ = spew.Sdump(nil)
_ = fmt.Sprint("")
}
func decode_var(ct *sql.ColumnType, val interface{}) (interface{}, error) {
var ret interface{}
switch val.(type) {
case int64:
ret = val.(int64)
case []uint8:
switch ct.ScanType() {
case reflect.TypeOf(uint8(0)):
c, cerr := strconv.ParseUint(string(val.([]uint8)), 10, 8)
if cerr != nil { return nil, cerr }
ret = uint8(c)
case reflect.TypeOf(uint16(0)):
c, cerr := strconv.ParseUint(string(val.([]uint8)), 10, 16)
if cerr != nil { return nil, cerr }
ret = uint16(c)
case reflect.TypeOf(uint32(0)):
c, cerr := strconv.ParseUint(string(val.([]uint8)), 10, 32)
if cerr != nil { return nil, cerr }
ret = uint32(c)
case reflect.TypeOf(uint64(0)):
c, cerr := strconv.ParseUint(string(val.([]uint8)), 10, 64)
if cerr != nil { return nil, cerr }
ret = uint64(c)
case reflect.TypeOf(int8(0)):
c, cerr := strconv.ParseInt(string(val.([]uint8)), 10, 8)
if cerr != nil { return nil, cerr }
ret = int8(c)
case reflect.TypeOf(int16(0)):
c, cerr := strconv.ParseInt(string(val.([]uint8)), 10, 16)
if cerr != nil { return nil, cerr }
ret = int16(c)
case reflect.TypeOf(int32(0)):
c, cerr := strconv.ParseInt(string(val.([]uint8)), 10, 32)
if cerr != nil { return nil, cerr }
ret = int32(c)
case reflect.TypeOf(int64(0)):
c, cerr := strconv.ParseInt(string(val.([]uint8)), 10, 64)
if cerr != nil { return nil, cerr }
ret = int64(c)
case reflect.TypeOf(float32(0)):
c, cerr := strconv.ParseFloat(string(val.([]uint8)), 32)
if cerr != nil { return nil, cerr }
ret = float32(c)
case reflect.TypeOf(float64(0)):
c, cerr := strconv.ParseFloat(string(val.([]uint8)), 64)
if cerr != nil { return nil, cerr }
ret = float64(c)
case reflect.TypeOf(sql.NullInt64{}):
c, cerr := strconv.ParseInt(string(val.([]uint8)), 10, 64)
if cerr == nil {
ret = c
} else {
uc, ucerr := strconv.ParseUint(string(val.([]uint8)), 10, 64)
if ucerr != nil { return nil, ucerr }
ret = uc
}
case reflect.TypeOf(sql.NullFloat64{}):
c, cerr := strconv.ParseFloat(string(val.([]uint8)), 64)
if cerr != nil { return nil, cerr }
ret = float64(c)
default:
switch ct.DatabaseTypeName() {
case "BIT":
ret = "0x"+hex.EncodeToString(val.([]uint8))
case "DECIMAL":
c, cerr := strconv.ParseFloat(string(val.([]uint8)), 64)
if cerr != nil { return nil, cerr }
ret = float64(c)
default:
ret = string(val.([]uint8))
}
}
case nil:
if nullable, ok := ct.Nullable(); ok && !nullable {
return nil, errors.New("NULL for not nullable field \""+ct.Name()+"\" returned")
}
ret = nil
default:
return nil, errors.New("Bad type "+reflect.TypeOf(val).String()+" returned")
}
return ret, nil
}
func return_query(db interface{}, query string, index string, args ...interface{}) (interface{}, error) {
var ret interface{}
if index == "" {
ret = make([]M, 0)
} else {
ret = make(M)
}
var rows *sql.Rows
var err error
switch db.(type) {
case *sql.DB:
rows, err = db.(*sql.DB).Query(query, args...)
case *sql.Tx:
rows, err = db.(*sql.Tx).Query(query, args...)
default:
return nil, errors.New("Bad db handle type:"+reflect.TypeOf(db).String())
}
if err != nil { return nil, err }
defer rows.Close()
var cols []string
cols, err = rows.Columns()
if err != nil { return nil, err }
index_column := -1
if index != "" {
for i := range cols {
if cols[i] == index {
index_column = i
break
}
}
if index_column == -1 { return nil, errors.New("No index column with name "+index+" in result set") }
}
var cts []*sql.ColumnType
cts, err = rows.ColumnTypes()
if err != nil { return nil, err }
_ = cts
for rows.Next() {
ptrs := make([]interface{}, len(cols))
vals := make([]interface{}, len(cols))
for i, _ := range ptrs {
ptrs[i] = &vals[i]
}
err = rows.Scan(ptrs...)
if err != nil { return nil, err }
row := make(M)
var index_value string
for i, val := range vals {
var v interface{}
v, err = decode_var(cts[i], val)
if err != nil { return nil, err }
row[cols[i]] = v
if i == index_column {
index_value = fmt.Sprint(v)
}
}
if index == "" {
ret = append(ret.([]M), row)
} else {
ret.(M)[ index_value ] = row
}
}
return ret, nil
}
func return_query_M(db interface{}, query string, index string, args ...interface{}) (M, error) {
m, err := return_query(db, query, index, args...)
if err != nil { return nil, err }
var ret M
var ok bool
if ret, ok = m.(M); !ok { return nil, errors.New("return_query_M: Bad type returned by return_query") }
return ret, nil
}
func return_query_A(db interface{}, query string, args ...interface{}) ([]M, error) {
m, err := return_query(db, query, "", args...)
if err != nil { return nil, err }
var ret []M
var ok bool
if ret, ok = m.([]M); !ok { return nil, errors.New("return_query_A: Bad type returned by return_query") }
return ret, nil
}
func db_exec(db interface{}, query string, args ...interface{}) (sql.Result, error) {
switch db.(type) {
case *sql.DB:
return db.(*sql.DB).Exec(query, args...)
case *sql.Tx:
return db.(*sql.Tx).Exec(query, args...)
default:
return nil, errors.New("Bad db handle type:"+reflect.TypeOf(db).String())
}
}
func return_arrays(db interface{}, query string, args ...interface{}) ([][]interface{}, error) {
ret := make([][]interface{}, 0)
var rows *sql.Rows
var err error
switch db.(type) {
case *sql.DB:
rows, err = db.(*sql.DB).Query(query, args...)
case *sql.Tx:
rows, err = db.(*sql.Tx).Query(query, args...)
default:
return nil, errors.New("Bad db handle type:"+reflect.TypeOf(db).String())
}
if err != nil { return nil, err }
defer rows.Close()
var cts []*sql.ColumnType
cts, err = rows.ColumnTypes()
if err != nil { return nil, err }
for rows.Next() {
ptrs := make([]interface{}, len(cts))
vals := make([]interface{}, len(cts))
for i, _ := range ptrs {
ptrs[i] = &vals[i]
}
err = rows.Scan(ptrs...)
if err != nil { return nil, err }
row := make([]interface{}, len(cts))
for i, val := range vals {
var v interface{}
v, err = decode_var(cts[i], val)
if err != nil { return nil, err }
row[i] = v
}
ret = append(ret, row)
}
return ret, nil
}
func must_return_one_M(db interface{}, query string, args ...interface{}) (M, error) {
a, err := return_query_A(db, query, args...)
if err != nil { return nil, err }
if len(a) == 0 {
return nil, errors.New("Zero rows returned")
}
if len(a) > 1 {
return nil, errors.New("More than one rows returned")
}
return a[0], nil
}
func must_return_one_uint(db interface{}, query string, args ...interface{}) (uint64, error) {
a, err := return_arrays(db, query, args...)
if err != nil { return 0, err }
if len(a) == 0 {
return 0, errors.New("Zero rows returned")
}
if len(a) > 1 {
return 0, errors.New("More than one rows returned")
}
if len(a[0]) != 1 {
return 0, errors.New("More than one columns returned")
}
switch v := a[0][0].(type) {
case int64:
if v < 0 { return 0, errors.New("Negative value returned") }
return uint64(v), nil
case int32:
if v < 0 { return 0, errors.New("Negative value returned") }
return uint64(v), nil
case int16:
if v < 0 { return 0, errors.New("Negative value returned") }
return uint64(v), nil
case int8:
if v < 0 { return 0, errors.New("Negative value returned") }
return uint64(v), nil
case int:
if v < 0 { return 0, errors.New("Negative value returned") }
return uint64(v), nil
case uint64:
return uint64(v), nil
case uint32:
return uint64(v), nil
case uint16:
return uint64(v), nil
case uint8:
return uint64(v), nil
case uint:
return uint64(v), nil
default:
return 0, errors.New("Non-numeric value returned: type: "+reflect.TypeOf(a[0][0]).Name())
}
panic("Should not get here")
}