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1 | <?php |
2 | |
3 | namespace BO\Zmsdb\Query\Builder; |
4 | |
5 | use BO\Zmsdb\Query\Builder\Dialect\ANSI; |
6 | |
7 | /** |
8 | * Query |
9 | * |
10 | * Base Query class that all other query types should inherit from. |
11 | * |
12 | * @package BO\Zmsdb\Query\Builder |
13 | * @author Alex Gisby<alex@solution10.com> |
14 | * @license MIT |
15 | */ |
16 | abstract class Query |
17 | { |
18 | /** |
19 | * @var DialectInterface |
20 | */ |
21 | protected $dialect; |
22 | |
23 | /** |
24 | * @var string The base part of the query (SELECT, INSERT etc) |
25 | */ |
26 | protected $queryBase = null; |
27 | |
28 | /** |
29 | * @var array Flags for this query |
30 | */ |
31 | protected $flags = []; |
32 | |
33 | /** |
34 | * Pass in a dialect, otherwise it'll assume ANSI SQL. |
35 | * |
36 | * @param DialectInterface|null $dialect |
37 | */ |
38 | public function __construct(DialectInterface $dialect = null) |
39 | { |
40 | $this->dialect = ($dialect === null) ? new ANSI() : $dialect; |
41 | } |
42 | |
43 | /** |
44 | * Gets/sets the query base for this query. |
45 | * Note: This will NOT be escaped in any way! Be super careful what you pass. |
46 | * |
47 | * @param null|string $base Null to get, string to set |
48 | * @return string|$this String on get, $this on set |
49 | */ |
50 | public function queryBaseStatement($base = null) |
51 | { |
52 | if ($base === null) { |
53 | return $this->queryBase; |
54 | } |
55 | $this->queryBase = $base; |
56 | return $this; |
57 | } |
58 | |
59 | /** |
60 | * Get/set the dialect in use for this query. |
61 | * |
62 | * @param null|DialectInterface $dialect Null to get, DialectInterface to set |
63 | * @return DialectInterface|$this DialectInterface on get, $this on set. |
64 | */ |
65 | public function dialect(DialectInterface $dialect = null) |
66 | { |
67 | if ($dialect === null) { |
68 | return $this->dialect; |
69 | } |
70 | $this->dialect = $dialect; |
71 | return $this; |
72 | } |
73 | |
74 | /** |
75 | * Get/Set a flag for the query. Flags are any metadata that you want passed around with |
76 | * the query, but not necessarily used within the generation of the SQL. For example you |
77 | * might put a cache TTL in there, or some engine specific flag for your database adapter |
78 | * to later read and use. |
79 | * |
80 | * Any type can be used as the flag value. |
81 | * |
82 | * @param string $flag Name of the flag |
83 | * @param null|mixed $value Null to get the flag, mixed to set it |
84 | * @return mixed|$this Flag value on read (null for not set), or $this on set. |
85 | */ |
86 | public function flag($flag, $value = null) |
87 | { |
88 | if ($value === null) { |
89 | return (array_key_exists($flag, $this->flags)) ? $this->flags[$flag] : null; |
90 | } |
91 | $this->flags[$flag] = $value; |
92 | return $this; |
93 | } |
94 | |
95 | /** |
96 | * Gets/Sets multiple flags for the query. Get returns all flags as a key => value array. |
97 | * Set accepts a key => value array. |
98 | * |
99 | * @param null|array $flags Null for get, array for set |
100 | * @return array|$this array on get, $this on set |
101 | * @see Query::flag() for more info on flags. |
102 | */ |
103 | public function flags(array $flags = null) |
104 | { |
105 | if (!is_array($flags)) { |
106 | return $this->flags; |
107 | } |
108 | foreach ($flags as $f => $v) { |
109 | $this->flags[$f] = $v; |
110 | } |
111 | return $this; |
112 | } |
113 | |
114 | /** |
115 | * Deletes a flag from the query. |
116 | * |
117 | * @param string $flag Name of the flag |
118 | * @return $this |
119 | */ |
120 | public function deleteFlag($flag) |
121 | { |
122 | unset($this->flags[$flag]); |
123 | return $this; |
124 | } |
125 | |
126 | /** |
127 | * Generates the full SQL statement for this query with all the composite parts. |
128 | * |
129 | * @return string |
130 | */ |
131 | abstract public function sql(); |
132 | |
133 | /** |
134 | * Serves as a shortcut for sql() |
135 | * |
136 | * @return string |
137 | */ |
138 | public function __toString() |
139 | { |
140 | return $this->sql(); |
141 | } |
142 | |
143 | /** |
144 | * Returns all the parameters, in the correct order, to pass into PDO. |
145 | * |
146 | * @return array |
147 | */ |
148 | abstract public function params(); |
149 | |
150 | /** |
151 | * Resets the entire query. |
152 | * |
153 | * @return $this |
154 | */ |
155 | abstract public function reset(); |
156 | |
157 | /** |
158 | * Returns all the tables that this query makes mention of, in FROMs and JOINs |
159 | * |
160 | * @return array |
161 | */ |
162 | abstract public function allTablesReferenced(); |
163 | } |