/**
*
*/
package cn.org.zeronote.orm.extractor;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import org.springframework.util.NumberUtils;
import cn.org.zeronote.orm.ORMColumn;
import cn.org.zeronote.orm.dao.SelectKey;
/**
* 自增主键查找器
* @author <a href='mailto:lizheng8318@gmail.com'>lizheng</a>
*
*/
public class IdentityFinder {
private Connection conn;
private SelectKey selectKey;
/**
* @param conn connection
* @param selectKey 自增主键查询
*/
public IdentityFinder(Connection conn, SelectKey selectKey) {
this.conn = conn;
this.selectKey = selectKey;
}
/**
* 查找自增主键并填充到队列中
* @param objs 填充对象
* @throws IllegalArgumentException exception
* @throws IllegalAccessException exception
* @throws SQLException exception
*/
public void find(Object... objs) throws IllegalArgumentException, IllegalAccessException, SQLException {
Class<?> clz = objs[0].getClass();
Field[] fields = clz.getDeclaredFields();
for (Field field : fields) {
ORMColumn oc = field.getAnnotation(ORMColumn.class);
if (oc != null && oc.physicalPkFld() && oc.autoIncrement()) {
// 找到最后一个自增id
QueryRunner qr = new QueryRunner();
Object identityVal = qr.query(conn, selectKey.getQuery(), new ScalarHandler<Object>());
Long identity = NumberUtils.parseNumber(identityVal.toString(), Long.class);
field.setAccessible(true);
// 填充到所有当中
for (int i = objs.length - 1; i >= 0; i--) {
if (field.get(objs[i]) == null) { // 判null，要求主键都是包装类
// 类型转换
@SuppressWarnings("unchecked")
Object val = NumberUtils.convertNumberToTargetClass(identity, ((Class<Number>)field.getType()));
field.set(objs[i], val);
identity--;
}
}
break;
}
}
}
}