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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Fluent builder for ALTER TABLE statements. |
| 5 | * |
| 6 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 7 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 8 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 9 | * |
| 10 | * @package phpMyFAQ |
| 11 | * @author Thorsten Rinne <thorsten@phpmyfaq.de> |
| 12 | * @copyright 2023-2026 phpMyFAQ Team |
| 13 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 14 | * @link https://www.phpmyfaq.de |
| 15 | * @since 2026-01-25 |
| 16 | */ |
| 17 | |
| 18 | declare(strict_types=1); |
| 19 | |
| 20 | namespace phpMyFAQ\Setup\Migration\QueryBuilder; |
| 21 | |
| 22 | use LogicException; |
| 23 | use phpMyFAQ\Database; |
| 24 | |
| 25 | class AlterTableBuilder |
| 26 | { |
| 27 | private string $tableName = ''; |
| 28 | private DialectInterface $dialect; |
| 29 | |
| 30 | /** @var array<int, array{action: string, column: string, type: string|null, after: string|null, default: string|null, nullable: bool}> */ |
| 31 | private array $alterations = []; |
| 32 | |
| 33 | public function __construct(?DialectInterface $dialect = null) |
| 34 | { |
| 35 | $this->dialect = $dialect ?? DialectFactory::create(); |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Sets the table name. |
| 40 | */ |
| 41 | public function table(string $name, bool $withPrefix = true): self |
| 42 | { |
| 43 | $this->tableName = $withPrefix ? Database::getTablePrefix() . $name : $name; |
| 44 | return $this; |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Adds a new INTEGER column. |
| 49 | */ |
| 50 | public function addInteger(string $name, bool $nullable = true, ?int $default = null, ?string $after = null): self |
| 51 | { |
| 52 | return $this->addColumn( |
| 53 | 'ADD', |
| 54 | $name, |
| 55 | $this->dialect->integer(), |
| 56 | $nullable, |
| 57 | $default !== null ? (string) $default : null, |
| 58 | $after, |
| 59 | ); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * Adds a new VARCHAR column. |
| 64 | */ |
| 65 | public function addVarchar( |
| 66 | string $name, |
| 67 | int $length, |
| 68 | bool $nullable = true, |
| 69 | ?string $default = null, |
| 70 | ?string $after = null, |
| 71 | ): self { |
| 72 | // Escape single quotes in default value per SQL string literal rules (replace ' with '') |
| 73 | $defaultVal = $default !== null ? "'" . str_replace(search: "'", replace: "''", subject: $default) . "'" : null; |
| 74 | return $this->addColumn('ADD', $name, $this->dialect->varchar($length), $nullable, $defaultVal, $after); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Adds a new TEXT column. |
| 79 | */ |
| 80 | public function addText(string $name, bool $nullable = true, ?string $after = null): self |
| 81 | { |
| 82 | return $this->addColumn('ADD', $name, $this->dialect->text(), $nullable, null, $after); |
| 83 | } |
| 84 | |
| 85 | /** |
| 86 | * Adds a new BOOLEAN column. |
| 87 | */ |
| 88 | public function addBoolean(string $name, bool $nullable = true, ?bool $default = null, ?string $after = null): self |
| 89 | { |
| 90 | $defaultVal = null; |
| 91 | if ($default !== null) { |
| 92 | $defaultVal = $default ? '1' : '0'; |
| 93 | } |
| 94 | |
| 95 | return $this->addColumn('ADD', $name, $this->dialect->boolean(), $nullable, $defaultVal, $after); |
| 96 | } |
| 97 | |
| 98 | /** |
| 99 | * Adds a new TIMESTAMP column. |
| 100 | */ |
| 101 | public function addTimestamp( |
| 102 | string $name, |
| 103 | bool $nullable = true, |
| 104 | bool $defaultCurrent = false, |
| 105 | ?string $after = null, |
| 106 | ): self { |
| 107 | $default = $defaultCurrent ? $this->dialect->currentTimestamp() : null; |
| 108 | return $this->addColumn('ADD', $name, $this->dialect->timestamp(), $nullable, $default, $after); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Modifies an existing column type. |
| 113 | */ |
| 114 | public function modifyColumn(string $name, string $type): self |
| 115 | { |
| 116 | $this->alterations[] = [ |
| 117 | 'action' => 'MODIFY', |
| 118 | 'column' => $name, |
| 119 | 'type' => $type, |
| 120 | 'after' => null, |
| 121 | 'default' => null, |
| 122 | 'nullable' => true, |
| 123 | ]; |
| 124 | return $this; |
| 125 | } |
| 126 | |
| 127 | /** |
| 128 | * Drops a column. |
| 129 | */ |
| 130 | public function dropColumn(string $name): self |
| 131 | { |
| 132 | $this->alterations[] = [ |
| 133 | 'action' => 'DROP', |
| 134 | 'column' => $name, |
| 135 | 'type' => null, |
| 136 | 'after' => null, |
| 137 | 'default' => null, |
| 138 | 'nullable' => true, |
| 139 | ]; |
| 140 | return $this; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Builds the ALTER TABLE statement(s). |
| 145 | * Returns an array of statements because some databases require separate statements for each alteration. |
| 146 | * |
| 147 | * @return string[] |
| 148 | */ |
| 149 | public function build(): array |
| 150 | { |
| 151 | // Validate that table() was called before building |
| 152 | if ($this->tableName === '') { |
| 153 | throw new \RuntimeException('Table name not set. Call table() before building ALTER TABLE statements.'); |
| 154 | } |
| 155 | |
| 156 | $statements = []; |
| 157 | |
| 158 | foreach ($this->alterations as $alt) { |
| 159 | switch ($alt['action']) { |
| 160 | case 'ADD': |
| 161 | $type = (string) $alt['type']; |
| 162 | if (!$alt['nullable']) { |
| 163 | $type .= ' NOT NULL'; |
| 164 | } |
| 165 | |
| 166 | if ($alt['nullable'] && $alt['default'] === null) { |
| 167 | $type .= ' NULL'; |
| 168 | } |
| 169 | |
| 170 | if ($alt['default'] !== null) { |
| 171 | $type .= ' DEFAULT ' . $alt['default']; |
| 172 | } |
| 173 | $statements[] = $this->dialect->addColumn( |
| 174 | $this->tableName, |
| 175 | $alt['column'], |
| 176 | $type, |
| 177 | $this->dialect->supportsColumnPositioning() ? $alt['after'] : null, |
| 178 | ); |
| 179 | break; |
| 180 | |
| 181 | case 'MODIFY': |
| 182 | $statements[] = $this->dialect->modifyColumn( |
| 183 | $this->tableName, |
| 184 | $alt['column'], |
| 185 | (string) $alt['type'], |
| 186 | ); |
| 187 | break; |
| 188 | |
| 189 | case 'DROP': |
| 190 | $statements[] = "ALTER TABLE {$this->tableName} DROP COLUMN {$alt['column']}"; |
| 191 | break; |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | return $statements; |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Builds a single ALTER TABLE statement combining all alterations (MySQL only). |
| 200 | */ |
| 201 | public function buildCombined(): string |
| 202 | { |
| 203 | if (!$this->dialect->supportsCombinedAlter()) { |
| 204 | throw new LogicException(sprintf( |
| 205 | 'Combined ALTER TABLE is only supported on MySQL. Current dialect: %s. Use build() instead.', |
| 206 | $this->dialect->getType(), |
| 207 | )); |
| 208 | } |
| 209 | |
| 210 | // Validate that table() was called before building |
| 211 | if ($this->tableName === '') { |
| 212 | throw new \RuntimeException('Table name not set. Call table() before building ALTER TABLE statements.'); |
| 213 | } |
| 214 | |
| 215 | if ($this->alterations === []) { |
| 216 | throw new LogicException('No alterations defined for combined ALTER TABLE statement.'); |
| 217 | } |
| 218 | |
| 219 | $parts = []; |
| 220 | |
| 221 | foreach ($this->alterations as $alt) { |
| 222 | switch ($alt['action']) { |
| 223 | case 'ADD': |
| 224 | $type = (string) $alt['type']; |
| 225 | if (!$alt['nullable']) { |
| 226 | $type .= ' NOT NULL'; |
| 227 | } |
| 228 | |
| 229 | if ($alt['nullable'] && $alt['default'] === null) { |
| 230 | $type .= ' NULL'; |
| 231 | } |
| 232 | |
| 233 | if ($alt['default'] !== null) { |
| 234 | $type .= ' DEFAULT ' . $alt['default']; |
| 235 | } |
| 236 | $part = "ADD COLUMN {$alt['column']} {$type}"; |
| 237 | if ($this->dialect->supportsColumnPositioning() && $alt['after'] !== null) { |
| 238 | $part .= " AFTER {$alt['after']}"; |
| 239 | } |
| 240 | $parts[] = $part; |
| 241 | break; |
| 242 | |
| 243 | case 'MODIFY': |
| 244 | $parts[] = "MODIFY {$alt['column']} {$alt['type']}"; |
| 245 | break; |
| 246 | |
| 247 | case 'DROP': |
| 248 | $parts[] = "DROP COLUMN {$alt['column']}"; |
| 249 | break; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | return "ALTER TABLE {$this->tableName} " . implode(', ', $parts); |
| 254 | } |
| 255 | |
| 256 | private function addColumn( |
| 257 | string $action, |
| 258 | string $name, |
| 259 | string $type, |
| 260 | bool $nullable, |
| 261 | ?string $default, |
| 262 | ?string $after, |
| 263 | ): self { |
| 264 | $this->alterations[] = [ |
| 265 | 'action' => $action, |
| 266 | 'column' => $name, |
| 267 | 'type' => $type, |
| 268 | 'after' => $after, |
| 269 | 'default' => $default, |
| 270 | 'nullable' => $nullable, |
| 271 | ]; |
| 272 | return $this; |
| 273 | } |
| 274 | } |