GenericDaoBase.java 文件源码

@DB()
protected String buildSelectByIdSql(final StringBuilder sql) {
    if (_idField == null) {
        return null;
    }

    if (_idField.getAnnotation(EmbeddedId.class) == null) {
        sql.append(_table).append(".").append(DbUtil.getColumnName(_idField, null)).append(" = ? ");
    } else {
        final Class<?> clazz = _idField.getClass();
        final AttributeOverride[] overrides = DbUtil.getAttributeOverrides(_idField);
        for (final Field field : clazz.getDeclaredFields()) {
            sql.append(_table).append(".").append(DbUtil.getColumnName(field, overrides)).append(" = ? AND ");
        }
        sql.delete(sql.length() - 4, sql.length());
    }

    return sql.toString();
}