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| 1 | <?php |
| 2 | |
| 3 | namespace UserFrosting; |
| 4 | |
| 5 | abstract class MySqlDatabaseObject extends MySqlDatabase implements DatabaseObjectInterface { |
| 6 | |
| 7 | /** |
| 8 | * @var DatabaseTable The table for this database object. Must be specified by child class. |
| 9 | */ |
| 10 | protected $_table; |
| 11 | |
| 12 | protected $_id; // The id of this object. Table must have an `id` column. |
| 13 | protected $_properties; // A mapping of the columns in the table that this object can access, to their values. |
| 14 | |
| 15 | /** |
| 16 | * @var array Columns that should not be included in UPDATE statements. |
| 17 | * Useful for computed columns in views that can be read but not written. |
| 18 | * Child classes can override this to exclude specific columns. |
| 19 | */ |
| 20 | protected $_nonUpdatableColumns = []; |
| 21 | |
| 22 | public function __construct($properties, $id = null) { |
| 23 | // Set all valid properties |
| 24 | foreach ($properties as $column => $value){ |
| 25 | if ($column != "id" && in_array($column, $this->_table->columns)) |
| 26 | $this->_properties[$column] = $value; |
| 27 | } |
| 28 | |
| 29 | // Set id |
| 30 | $this->_id = $id; |
| 31 | } |
| 32 | |
| 33 | public function table(){ |
| 34 | return $this->_table; |
| 35 | } |
| 36 | |
| 37 | public function __isset($name) { |
| 38 | if ($name == "id" || isset($this->_properties[$name])) |
| 39 | return true; |
| 40 | else |
| 41 | return false; |
| 42 | } |
| 43 | |
| 44 | public function __get($name){ |
| 45 | if ($name == "id") |
| 46 | return $this->_id; |
| 47 | else if (in_array($name, $this->_table->columns)) |
| 48 | return $this->_properties[$name]; |
| 49 | else { |
| 50 | $table = $this->_table->name; |
| 51 | throw new \Exception("The column '$name' does not exist in the table '$table'."); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | // This function only allows whitelisted column names! This is VERY IMPORTANT, otherwise the database will be open to SQL injection attacks. |
| 56 | public function __set($name, $value){ |
| 57 | if (in_array($name, $this->_table->columns)) |
| 58 | return $this->_properties[$name] = $value; |
| 59 | else { |
| 60 | $table = $this->_table->name; |
| 61 | throw new \Exception("The column '$name' does not exist in the table '$table'."); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | /* Refresh the object from the DB. |
| 66 | * |
| 67 | */ |
| 68 | // TODO: Should this just update the internal contents of this object, rather than create a new one? |
| 69 | public function fresh(){ |
| 70 | if (isset($this->_id)){ |
| 71 | $db = static::connection(); |
| 72 | |
| 73 | $table = $this->_table->name; |
| 74 | |
| 75 | $query = "SELECT * FROM `$table` WHERE id = :id LIMIT 1"; |
| 76 | |
| 77 | $stmt = $db->prepare($query); |
| 78 | |
| 79 | $sqlVars[':id'] = $this->_id; |
| 80 | |
| 81 | $stmt->execute($sqlVars); |
| 82 | |
| 83 | $results = $stmt->fetch(\PDO::FETCH_ASSOC); |
| 84 | |
| 85 | // PDO returns false if no record found |
| 86 | if ($results) |
| 87 | return $results; |
| 88 | } |
| 89 | throw new \Exception("Could not refresh this object! Either it does not exist in the database, or is in an invalid state."); |
| 90 | } |
| 91 | |
| 92 | /* Get the properties of this object as an associative array. |
| 93 | * |
| 94 | */ |
| 95 | public function export(){ |
| 96 | return array_merge(["id" => $this->_id], $this->_properties); |
| 97 | } |
| 98 | |
| 99 | /* Store the object in the DB, creating a new record if one doesn't already exist. |
| 100 | * |
| 101 | */ |
| 102 | public function store() { |
| 103 | // Get connection |
| 104 | $db = static::connection(); |
| 105 | $table = $this->_table->name; |
| 106 | |
| 107 | // If `id` is set, then update the existing record. |
| 108 | // Using UPDATE instead of INSERT...ON DUPLICATE KEY UPDATE |
| 109 | // to support views that can't accept INSERTs. |
| 110 | |
| 111 | if ($this->_id) { |
| 112 | $set_terms = []; |
| 113 | $sqlVars = []; |
| 114 | foreach ($this->_properties as $name => $value){ |
| 115 | // Skip non-updatable columns (e.g., computed columns in views) |
| 116 | if (in_array($name, $this->_nonUpdatableColumns)) { |
| 117 | continue; |
| 118 | } |
| 119 | $set_terms[] = "`$name` = :$name"; |
| 120 | $sqlVars[":$name"] = $value; |
| 121 | } |
| 122 | |
| 123 | $sqlVars[':id'] = $this->_id; |
| 124 | |
| 125 | $set_clause = implode(", ", $set_terms); |
| 126 | |
| 127 | $query = " |
| 128 | UPDATE `$table` |
| 129 | SET $set_clause |
| 130 | WHERE id = :id"; |
| 131 | |
| 132 | $stmt = $db->prepare($query); |
| 133 | $stmt->execute($sqlVars); |
| 134 | } else { |
| 135 | $sqlVars = []; |
| 136 | $column_list = []; |
| 137 | $value_list = []; |
| 138 | foreach ($this->_properties as $name => $value){ |
| 139 | // Skip non-updatable columns for inserts too |
| 140 | if (in_array($name, $this->_nonUpdatableColumns)) { |
| 141 | continue; |
| 142 | } |
| 143 | $column_list[] = "`$name`"; |
| 144 | $value_list[] = ":$name"; |
| 145 | $sqlVars[":$name"] = $value; |
| 146 | } |
| 147 | |
| 148 | $column_clause = implode(",", $column_list); |
| 149 | $value_clause = implode(",", $value_list); |
| 150 | |
| 151 | $query = " |
| 152 | INSERT INTO `$table` |
| 153 | ( $column_clause ) |
| 154 | VALUES ( $value_clause );"; |
| 155 | |
| 156 | $stmt = $db->prepare($query); |
| 157 | $stmt->execute($sqlVars); |
| 158 | $this->_id = $db->lastInsertId(); |
| 159 | } |
| 160 | return $this->_id; |
| 161 | } |
| 162 | |
| 163 | /*** Delete the object from the database, if it exists |
| 164 | ***/ |
| 165 | public function delete(){ |
| 166 | // Get connection |
| 167 | $db = static::connection(); |
| 168 | $table = $this->_table->name; |
| 169 | |
| 170 | // Can only delete an object where `id` is set |
| 171 | if (!$this->_id) { |
| 172 | return false; |
| 173 | } |
| 174 | |
| 175 | $sqlVars[":id"] = $this->_id; |
| 176 | |
| 177 | $query = " |
| 178 | DELETE FROM `$table` |
| 179 | WHERE id = :id"; |
| 180 | |
| 181 | $stmt = $db->prepare($query); |
| 182 | $stmt->execute($sqlVars); |
| 183 | |
| 184 | if ($stmt->rowCount()) |
| 185 | return true; |
| 186 | else |
| 187 | return false; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | ?> |