function DatabaseSchema_sqlite::changeField

Overrides DatabaseSchema::changeField

File

includes/database/sqlite/schema.inc, line 495

Class

DatabaseSchema_sqlite

Code

public function changeField($table, $field, $field_new, $spec, $keys_new = array()) {
    if (!$this->fieldExists($table, $field)) {
        throw new DatabaseSchemaObjectDoesNotExistException(t("Cannot change the definition of field @table.@name: field doesn't exist.", array(
            '@table' => $table,
            '@name' => $field,
        )));
    }
    if ($field != $field_new && $this->fieldExists($table, $field_new)) {
        throw new DatabaseSchemaObjectExistsException(t("Cannot rename field @table.@name to @name_new: target field already exists.", array(
            '@table' => $table,
            '@name' => $field,
            '@name_new' => $field_new,
        )));
    }
    $old_schema = $this->introspectSchema($table);
    $new_schema = $old_schema;
    // Map the old field to the new field.
    if ($field != $field_new) {
        $mapping[$field_new] = $field;
    }
    else {
        $mapping = array();
    }
    // Remove the previous definition and swap in the new one.
    unset($new_schema['fields'][$field]);
    $new_schema['fields'][$field_new] = $spec;
    // Map the former indexes to the new column name.
    $new_schema['primary key'] = $this->mapKeyDefinition($new_schema['primary key'], $mapping);
    foreach (array(
        'unique keys',
        'indexes',
    ) as $k) {
        foreach ($new_schema[$k] as &$key_definition) {
            $key_definition = $this->mapKeyDefinition($key_definition, $mapping);
        }
    }
    // Add in the keys from $keys_new.
    if (isset($keys_new['primary key'])) {
        $new_schema['primary key'] = $keys_new['primary key'];
    }
    foreach (array(
        'unique keys',
        'indexes',
    ) as $k) {
        if (!empty($keys_new[$k])) {
            $new_schema[$k] = $keys_new[$k] + $new_schema[$k];
        }
    }
    $this->alterTable($table, $old_schema, $new_schema, $mapping);
}