/
dialect.go
285 lines (246 loc) · 6.81 KB
/
dialect.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
// Copyright 2019 GoAdmin Core Team. All rights reserved.
// Use of this source code is governed by a Apache-2.0 style
// license that can be found in the LICENSE file.
package dialect
import (
"strings"
"github.com/GoAdminGroup/go-admin/modules/config"
)
// Dialect is methods set of different driver.
type Dialect interface {
// GetName get dialect's name
GetName() string
// ShowColumns show columns of specified table
ShowColumns(table string) string
// ShowColumnsWithComment show columns with coment of specified table
ShowColumnsWithComment(schema, table string) string
// ShowTables show tables of database
ShowTables() string
// Insert
Insert(comp *SQLComponent) string
// Delete
Delete(comp *SQLComponent) string
// Update
Update(comp *SQLComponent) string
// Select
Select(comp *SQLComponent) string
// GetDelimiter return the delimiter of Dialect.
GetDelimiter() string
}
// GetDialect return the default Dialect.
func GetDialect() Dialect {
return GetDialectByDriver(config.GetDatabases().GetDefault().Driver)
}
// GetDialectByDriver return the Dialect of given driver.
func GetDialectByDriver(driver string) Dialect {
switch driver {
case "mysql":
return mysql{
commonDialect: commonDialect{delimiter: "`", delimiter2: "`"},
}
case "mssql":
return mssql{
commonDialect: commonDialect{delimiter: "[", delimiter2: "]"},
}
case "postgresql":
return postgresql{
commonDialect: commonDialect{delimiter: `"`, delimiter2: `"`},
}
case "sqlite":
return sqlite{
commonDialect: commonDialect{delimiter: "`", delimiter2: "`"},
}
case "oceanbase":
return oceanbase{
commonDialect: commonDialect{delimiter: "`", delimiter2: "`"},
}
default:
return commonDialect{delimiter: "`", delimiter2: "`"}
}
}
// H is a shorthand of map.
type H map[string]interface{}
// SQLComponent is a sql components set.
type SQLComponent struct {
Fields []string
Functions []string
TableName string
Wheres []Where
Leftjoins []Join
Args []interface{}
Order string
Offset string
Limit string
WhereRaws string
UpdateRaws []RawUpdate
Group string
Statement string
Values H
}
// Where contains the operation and field.
type Where struct {
Operation string
Field string
Qmark string
}
// Join contains the table and field and operation.
type Join struct {
Table string
FieldA string
Operation string
FieldB string
}
// RawUpdate contains the expression and arguments.
type RawUpdate struct {
Expression string
Args []interface{}
}
// *******************************
// internal help function
// *******************************
func (sql *SQLComponent) getLimit() string {
if sql.Limit == "" {
return ""
}
return " limit " + sql.Limit + " "
}
func (sql *SQLComponent) getOffset() string {
if sql.Offset == "" {
return ""
}
return " offset " + sql.Offset + " "
}
func (sql *SQLComponent) getOrderBy() string {
if sql.Order == "" {
return ""
}
return " order by " + sql.Order + " "
}
func (sql *SQLComponent) getGroupBy() string {
if sql.Group == "" {
return ""
}
return " group by " + sql.Group + " "
}
func (sql *SQLComponent) getJoins(delimiter, delimiter2 string) string {
if len(sql.Leftjoins) == 0 {
return ""
}
joins := ""
for _, join := range sql.Leftjoins {
joins += " left join " + wrap(delimiter, delimiter2, join.Table) + " on " +
sql.processLeftJoinField(join.FieldA, delimiter, delimiter2) + " " + join.Operation + " " +
sql.processLeftJoinField(join.FieldB, delimiter, delimiter2) + " "
}
return joins
}
func (sql *SQLComponent) processLeftJoinField(field, delimiter, delimiter2 string) string {
arr := strings.Split(field, ".")
if len(arr) > 0 {
return delimiter + arr[0] + delimiter2 + "." + delimiter + arr[1] + delimiter2
}
return field
}
func (sql *SQLComponent) getFields(delimiter, delimiter2 string) string {
if len(sql.Fields) == 0 {
return "*"
}
fields := ""
if len(sql.Leftjoins) == 0 {
for k, field := range sql.Fields {
if sql.Functions[k] != "" {
fields += sql.Functions[k] + "(" + wrap(delimiter, delimiter2, field) + "),"
} else {
fields += wrap(delimiter, delimiter2, field) + ","
}
}
} else {
for _, field := range sql.Fields {
arr := strings.Split(field, ".")
if len(arr) > 1 {
fields += wrap(delimiter, delimiter2, arr[0]) + "." + wrap(delimiter, delimiter2, arr[1]) + ","
} else {
fields += wrap(delimiter, delimiter2, field) + ","
}
}
}
return fields[:len(fields)-1]
}
func wrap(delimiter, delimiter2, field string) string {
if field == "*" {
return "*"
}
return delimiter + field + delimiter2
}
func (sql *SQLComponent) getWheres(delimiter, delimiter2 string) string {
if len(sql.Wheres) == 0 {
if sql.WhereRaws != "" {
return " where " + sql.WhereRaws
}
return ""
}
wheres := " where "
var arr []string
for _, where := range sql.Wheres {
arr = strings.Split(where.Field, ".")
if len(arr) > 1 {
wheres += arr[0] + "." + wrap(delimiter, delimiter2, arr[1]) + " " + where.Operation + " " + where.Qmark + " and "
} else {
wheres += wrap(delimiter, delimiter2, where.Field) + " " + where.Operation + " " + where.Qmark + " and "
}
}
if sql.WhereRaws != "" {
return wheres + sql.WhereRaws
}
return wheres[:len(wheres)-5]
}
func (sql *SQLComponent) prepareUpdate(delimiter, delimiter2 string) {
fields := ""
args := make([]interface{}, 0)
if len(sql.Values) != 0 {
for key, value := range sql.Values {
fields += wrap(delimiter, delimiter2, key) + " = ?, "
args = append(args, value)
}
if len(sql.UpdateRaws) == 0 {
fields = fields[:len(fields)-2]
} else {
for i := 0; i < len(sql.UpdateRaws); i++ {
if i == len(sql.UpdateRaws)-1 {
fields += sql.UpdateRaws[i].Expression + " "
} else {
fields += sql.UpdateRaws[i].Expression + ","
}
args = append(args, sql.UpdateRaws[i].Args...)
}
}
sql.Args = append(args, sql.Args...)
} else {
if len(sql.UpdateRaws) == 0 {
panic("prepareUpdate: wrong parameter")
} else {
for i := 0; i < len(sql.UpdateRaws); i++ {
if i == len(sql.UpdateRaws)-1 {
fields += sql.UpdateRaws[i].Expression + " "
} else {
fields += sql.UpdateRaws[i].Expression + ","
}
args = append(args, sql.UpdateRaws[i].Args...)
}
}
sql.Args = append(args, sql.Args...)
}
sql.Statement = "update " + delimiter + sql.TableName + delimiter2 + " set " + fields + sql.getWheres(delimiter, delimiter2)
}
func (sql *SQLComponent) prepareInsert(delimiter, delimiter2 string) {
fields := " ("
quesMark := "("
for key, value := range sql.Values {
fields += wrap(delimiter, delimiter2, key) + ","
quesMark += "?,"
sql.Args = append(sql.Args, value)
}
fields = fields[:len(fields)-1] + ")"
quesMark = quesMark[:len(quesMark)-1] + ")"
sql.Statement = "insert into " + delimiter + sql.TableName + delimiter2 + fields + " values " + quesMark
}