/
SqlServerGrammar.php
executable file
·344 lines (291 loc) · 9.81 KB
/
SqlServerGrammar.php
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
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
<?php
namespace Illuminate\Database\Query\Grammars;
use Illuminate\Database\Query\Builder;
class SqlServerGrammar extends Grammar
{
/**
* All of the available clause operators.
*
* @var array
*/
protected $operators = [
'=', '<', '>', '<=', '>=', '!<', '!>', '<>', '!=',
'like', 'not like', 'between', 'ilike',
'&', '&=', '|', '|=', '^', '^=',
];
/**
* Compile a select query into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @return string
*/
public function compileSelect(Builder $query)
{
if (is_null($query->columns)) {
$query->columns = ['*'];
}
$components = $this->compileComponents($query);
// If an offset is present on the query, we will need to wrap the query in
// a big "ANSI" offset syntax block. This is very nasty compared to the
// other database systems but is necessary for implementing features.
if ($query->offset > 0) {
return $this->compileAnsiOffset($query, $components);
}
return $this->concatenate($components);
}
/**
* Compile the "select *" portion of the query.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $columns
* @return string|null
*/
protected function compileColumns(Builder $query, $columns)
{
if (! is_null($query->aggregate)) {
return;
}
$select = $query->distinct ? 'select distinct ' : 'select ';
// If there is a limit on the query, but not an offset, we will add the top
// clause to the query, which serves as a "limit" type clause within the
// SQL Server system similar to the limit keywords available in MySQL.
if ($query->limit > 0 && $query->offset <= 0) {
$select .= 'top '.$query->limit.' ';
}
return $select.$this->columnize($columns);
}
/**
* Compile the "from" portion of the query.
*
* @param \Illuminate\Database\Query\Builder $query
* @param string $table
* @return string
*/
protected function compileFrom(Builder $query, $table)
{
$from = parent::compileFrom($query, $table);
if (is_string($query->lock)) {
return $from.' '.$query->lock;
}
if (! is_null($query->lock)) {
return $from.' with(rowlock,'.($query->lock ? 'updlock,' : '').'holdlock)';
}
return $from;
}
/**
* Create a full ANSI offset clause for the query.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $components
* @return string
*/
protected function compileAnsiOffset(Builder $query, $components)
{
// An ORDER BY clause is required to make this offset query work, so if one does
// not exist we'll just create a dummy clause to trick the database and so it
// does not complain about the queries for not having an "order by" clause.
if (! isset($components['orders'])) {
$components['orders'] = 'order by (select 0)';
}
// We need to add the row number to the query so we can compare it to the offset
// and limit values given for the statements. So we will add an expression to
// the "select" that will give back the row numbers on each of the records.
$orderings = $components['orders'];
$components['columns'] .= $this->compileOver($orderings);
unset($components['orders']);
// Next we need to calculate the constraints that should be placed on the query
// to get the right offset and limit from our query but if there is no limit
// set we will just handle the offset only since that is all that matters.
$constraint = $this->compileRowConstraint($query);
$sql = $this->concatenate($components);
// We are now ready to build the final SQL query so we'll create a common table
// expression from the query and get the records with row numbers within our
// given limit and offset value that we just put on as a query constraint.
return $this->compileTableExpression($sql, $constraint);
}
/**
* Compile the over statement for a table expression.
*
* @param string $orderings
* @return string
*/
protected function compileOver($orderings)
{
return ", row_number() over ({$orderings}) as row_num";
}
/**
* Compile the limit / offset row constraint for a query.
*
* @param \Illuminate\Database\Query\Builder $query
* @return string
*/
protected function compileRowConstraint($query)
{
$start = $query->offset + 1;
if ($query->limit > 0) {
$finish = $query->offset + $query->limit;
return "between {$start} and {$finish}";
}
return ">= {$start}";
}
/**
* Compile a common table expression for a query.
*
* @param string $sql
* @param string $constraint
* @return string
*/
protected function compileTableExpression($sql, $constraint)
{
return "select * from ({$sql}) as temp_table where row_num {$constraint}";
}
/**
* Compile the "limit" portions of the query.
*
* @param \Illuminate\Database\Query\Builder $query
* @param int $limit
* @return string
*/
protected function compileLimit(Builder $query, $limit)
{
return '';
}
/**
* Compile the "offset" portions of the query.
*
* @param \Illuminate\Database\Query\Builder $query
* @param int $offset
* @return string
*/
protected function compileOffset(Builder $query, $offset)
{
return '';
}
/**
* Compile a truncate table statement into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @return array
*/
public function compileTruncate(Builder $query)
{
return ['truncate table '.$this->wrapTable($query->from) => []];
}
/**
* Compile an exists statement into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @return string
*/
public function compileExists(Builder $query)
{
$existsQuery = clone $query;
$existsQuery->columns = [];
return $this->compileSelect($existsQuery->selectRaw('1 [exists]')->limit(1));
}
/**
* Compile a "where date" clause.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $where
* @return string
*/
protected function whereDate(Builder $query, $where)
{
$value = $this->parameter($where['value']);
return 'cast('.$this->wrap($where['column']).' as date) '.$where['operator'].' '.$value;
}
/**
* Determine if the grammar supports savepoints.
*
* @return bool
*/
public function supportsSavepoints()
{
return false;
}
/**
* Get the format for database stored dates.
*
* @return string
*/
public function getDateFormat()
{
return 'Y-m-d H:i:s.000';
}
/**
* Wrap a single string in keyword identifiers.
*
* @param string $value
* @return string
*/
protected function wrapValue($value)
{
if ($value === '*') {
return $value;
}
return '['.str_replace(']', ']]', $value).']';
}
/**
* Compile an update statement into SQL.
*
* @param \Illuminate\Database\Query\Builder $query
* @param array $values
* @return string
*/
public function compileUpdate(Builder $query, $values)
{
$table = $alias = $this->wrapTable($query->from);
if (strpos(strtolower($table), '] as [') !== false) {
$segments = explode('] as [', $table);
$alias = '['.$segments[1];
}
// Each one of the columns in the update statements needs to be wrapped in the
// keyword identifiers, also a place-holder needs to be created for each of
// the values in the list of bindings so we can make the sets statements.
$columns = [];
foreach ($values as $key => $value) {
$columns[] = $this->wrap($key).' = '.$this->parameter($value);
}
$columns = implode(', ', $columns);
// If the query has any "join" clauses, we will setup the joins on the builder
// and compile them so we can attach them to this update, as update queries
// can get join statements to attach to other tables when they're needed.
if (isset($query->joins)) {
$joins = ' '.$this->compileJoins($query, $query->joins);
} else {
$joins = '';
}
// Of course, update queries may also be constrained by where clauses so we'll
// need to compile the where clauses and attach it to the query so only the
// intended records are updated by the SQL statements we generate to run.
$where = $this->compileWheres($query);
if (! empty($joins)) {
return trim("update {$alias} set {$columns} from {$table}{$joins} {$where}");
}
return trim("update {$table}{$joins} set $columns $where");
}
/**
* Wrap a table in keyword identifiers.
*
* @param \Illuminate\Database\Query\Expression|string $table
* @return string
*/
public function wrapTable($table)
{
return $this->wrapTableValuedFunction(parent::wrapTable($table));
}
/**
* Wrap a table in keyword identifiers.
*
* @param string $table
* @return string
*/
protected function wrapTableValuedFunction($table)
{
if (preg_match('/^(.+?)(\(.*?\))]$/', $table, $matches) === 1) {
$table = $matches[1].']'.$matches[2];
}
return $table;
}
}