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1 | <?php |
2 | |
3 | namespace Wikimedia\Rdbms; |
4 | |
5 | use InvalidArgumentException; |
6 | use UnexpectedValueException; |
7 | |
8 | /** |
9 | * Build REPLACE queries with a fluent interface. |
10 | * |
11 | * Each query builder object must be used for a single database query only, |
12 | * and not be reused afterwards. To run multiple similar queries, you can |
13 | * create a query builder to set up most of your query, which you can use |
14 | * as a "template" to clone. You can then modify the cloned object for |
15 | * each individual query. |
16 | * |
17 | * @since 1.41 |
18 | * @stable to extend |
19 | * @ingroup Database |
20 | */ |
21 | class ReplaceQueryBuilder { |
22 | /** |
23 | * @var string The table name to be passed to IDatabase::replace() |
24 | */ |
25 | private $table = ''; |
26 | |
27 | /** |
28 | * @var list<array> The rows to be passed to IDatabase::replace() |
29 | */ |
30 | private $rows = []; |
31 | |
32 | /** |
33 | * @var string The caller (function name) to be passed to IDatabase::replace() |
34 | */ |
35 | private $caller = __CLASS__; |
36 | |
37 | /** |
38 | * @var string[] The unique keys to be passed to IDatabase::replace() |
39 | */ |
40 | private $uniqueIndexFields = []; |
41 | |
42 | protected IDatabase $db; |
43 | |
44 | /** |
45 | * Only for use in subclasses. To create a ReplaceQueryBuilder instance, |
46 | * use `$db->newReplaceQueryBuilder()` instead. |
47 | */ |
48 | public function __construct( IDatabase $db ) { |
49 | $this->db = $db; |
50 | } |
51 | |
52 | /** |
53 | * Change the IDatabase object the query builder is bound to. The specified |
54 | * IDatabase will subsequently be used to execute the query. |
55 | * |
56 | * @param IDatabase $db |
57 | * @return $this |
58 | */ |
59 | public function connection( IDatabase $db ) { |
60 | if ( $this->db->getType() !== $db->getType() ) { |
61 | throw new InvalidArgumentException( |
62 | __METHOD__ . ' cannot switch to a database of a different type.' |
63 | ); |
64 | } |
65 | $this->db = $db; |
66 | return $this; |
67 | } |
68 | |
69 | /** |
70 | * Set the query parameters to the given values, appending to the values |
71 | * which were already set. This can be used to interface with legacy code. |
72 | * If a key is omitted, the previous value will be retained. |
73 | * |
74 | * The parameters must be formatted as required by Database::replace. |
75 | * |
76 | * @param array $info Associative array of query info, with keys: |
77 | * - table: The table name to be passed to Database::replace() |
78 | * - rows: The rows to be inserted |
79 | * - options: The query options |
80 | * - caller: The caller signature |
81 | * |
82 | * @return $this |
83 | */ |
84 | public function queryInfo( $info ) { |
85 | if ( isset( $info['table'] ) ) { |
86 | $this->table( $info['table'] ); |
87 | } |
88 | if ( isset( $info['rows'] ) ) { |
89 | $this->rows( $info['rows'] ); |
90 | } |
91 | if ( isset( $info['uniqueIndexFields'] ) ) { |
92 | $this->uniqueIndexFields( (array)$info['uniqueIndexFields'] ); |
93 | } |
94 | if ( isset( $info['caller'] ) ) { |
95 | $this->caller( $info['caller'] ); |
96 | } |
97 | return $this; |
98 | } |
99 | |
100 | /** |
101 | * Manually set the table name to be passed to IDatabase::replace() |
102 | * |
103 | * @param string $table The unqualified name of a table |
104 | * @param-taint $table exec_sql |
105 | * @return $this |
106 | */ |
107 | public function table( $table ) { |
108 | $this->table = $table; |
109 | return $this; |
110 | } |
111 | |
112 | /** |
113 | * Set table for the query. Alias for table(). |
114 | * |
115 | * @param string $table The unqualified name of a table |
116 | * @param-taint $table exec_sql |
117 | * @return $this |
118 | */ |
119 | public function replaceInto( string $table ) { |
120 | return $this->table( $table ); |
121 | } |
122 | |
123 | /** |
124 | * Add rows to be inserted. |
125 | * |
126 | * @param list<array> $rows |
127 | * $rows should be an integer-keyed list of such string-keyed maps, defining a list of new rows. |
128 | * The keys in each map must be identical to each other and in the same order. |
129 | * The rows must not collide with each other. |
130 | * |
131 | * @return $this |
132 | */ |
133 | public function rows( array $rows ) { |
134 | $this->rows = array_merge( $this->rows, $rows ); |
135 | return $this; |
136 | } |
137 | |
138 | /** |
139 | * Add one row to be inserted. |
140 | * |
141 | * @param array $row |
142 | * $row must be a string-keyed map of (column name => value) defining a new row. Values are |
143 | * treated as literals and quoted appropriately; null is interpreted as NULL. |
144 | * |
145 | * @return $this |
146 | */ |
147 | public function row( array $row ) { |
148 | $this->rows[] = $row; |
149 | return $this; |
150 | } |
151 | |
152 | /** |
153 | * Set the unique index fields |
154 | * |
155 | * @param string|string[] $uniqueIndexFields |
156 | * @return $this |
157 | */ |
158 | public function uniqueIndexFields( $uniqueIndexFields ) { |
159 | if ( is_string( $uniqueIndexFields ) ) { |
160 | $uniqueIndexFields = [ $uniqueIndexFields ]; |
161 | } |
162 | $this->uniqueIndexFields = $uniqueIndexFields; |
163 | return $this; |
164 | } |
165 | |
166 | /** |
167 | * Set the method name to be included in an SQL comment. |
168 | * |
169 | * @param string $fname |
170 | * @param-taint $fname exec_sql |
171 | * @return $this |
172 | */ |
173 | public function caller( $fname ) { |
174 | $this->caller = $fname; |
175 | return $this; |
176 | } |
177 | |
178 | /** |
179 | * Run the constructed REPLACE query and return the result. |
180 | */ |
181 | public function execute() { |
182 | if ( !$this->rows ) { |
183 | throw new UnexpectedValueException( |
184 | __METHOD__ . ' can\'t have empty $rows value' ); |
185 | } |
186 | if ( $this->table === '' ) { |
187 | throw new UnexpectedValueException( |
188 | __METHOD__ . ' expects table not to be empty' ); |
189 | } |
190 | if ( !$this->uniqueIndexFields ) { |
191 | throw new UnexpectedValueException( |
192 | __METHOD__ . ' expects unique key to be provided' ); |
193 | } |
194 | $this->db->replace( $this->table, [ $this->uniqueIndexFields ], $this->rows, $this->caller ); |
195 | } |
196 | |
197 | /** |
198 | * Get an associative array describing the query in terms of its raw parameters to |
199 | * Database::replace(). This can be used to interface with legacy code. |
200 | * |
201 | * @return array The query info array, with keys: |
202 | * - table: The table name |
203 | * - rows: The rows array |
204 | * - options: The query options |
205 | * - caller: The caller signature |
206 | */ |
207 | public function getQueryInfo() { |
208 | $info = [ |
209 | 'table' => $this->table, |
210 | 'rows' => $this->rows, |
211 | 'uniqueIndexFields' => $this->uniqueIndexFields, |
212 | ]; |
213 | if ( $this->caller !== __CLASS__ ) { |
214 | $info['caller'] = $this->caller; |
215 | } |
216 | return $info; |
217 | } |
218 | } |