/**
* 通过表的实体类，获取表的概要描述，包括：表名、主键、自增字段、字段、默认值
* 应该根据不同的数据库类型创建对应的TableSchema类：$dbType = $this->getDriver(false)->getDbType();
* 这里只用到MySQL数据库，暂时不做多数据库类型
* @param string $tableName
* @return \tfc\db\TableSchema
*/
public function getTableSchema($tableName)
{
$className = 'tfc\\db\\TableSchema::' . strtolower($tableName);
if (Singleton::has($className)) {
return Singleton::get($className);
}
$ref = $this->getRefClass($tableName);
$attributes = $ref->getDefaultProperties();
$tableSchema = new TableSchema();
$tableSchema->name = $ref->hasConstant('TABLE_NAME') ? $ref->getConstant('TABLE_NAME') : $ref->getShortName();
$tableSchema->autoIncrement = $ref->hasConstant('AUTO_INCREMENT') ? $ref->getConstant('AUTO_INCREMENT') : null;
if (isset($attributes['primaryKey'])) {
$tableSchema->primaryKey = $attributes['primaryKey'];
unset($attributes['primaryKey']);
}
$tableSchema->columnNames = array_keys($attributes);
if ($tableSchema->primaryKey === null) {
$tableSchema->primaryKey = $tableSchema->columnNames[0];
}
foreach ($attributes as $key => $value) {
if ($value === null) {
unset($attributes[$key]);
}
}
$tableSchema->attributeDefaults = $attributes;
Singleton::set($className, $tableSchema);
return $tableSchema;
}
