package frame.object.meta;

import java.sql.ResultSetMetaData;

import frame.persist.IMetaDataLoader;
import frame.persist.NamedSQL;
import frame.persist.SQLRunner;
import frame.persist.loader.ResultMetaFieldReader;


public class EntityMetaLoader implements IMetaDataLoader {
	
	private String metaName;
	private EntityMeta entityMeta;
	
	
	public EntityMetaLoader() {
	}

	public EntityMeta getEntityMetaByTable(String tableName) throws Exception {
		this.metaName = tableName;
		
		String sql = "select * from " + tableName + " where 1 <> 1";
		SQLRunner.getTableMetaData(this, sql);
		return entityMeta;
	}
	
	public EntityMeta getEntityMetaByNamedSQL(NamedSQL namedSQL) throws Exception {
		this.metaName = namedSQL.getName();
		
		SQLRunner.getTableMetaData(this, namedSQL.getSQL());
		return entityMeta;
	}
	
	public void load(ResultSetMetaData metaData) throws Exception {
		ResultMetaFieldReader fieldReader = new ResultMetaFieldReader(metaData);
		entityMeta = new EntityMeta(metaName, fieldReader);
	}

}