解析sql时，解决通过from位置拼接sql的bug

src/main/java/com/uas/report/service/impl/PrintServiceImpl.java

@@ -762,8 +762,16 @@ public class PrintServiceImpl implements PrintService {
 	 * @throws SQLException
 	 */
 	private int getCount(Connection connection, String sql) throws SQLException {
-		sql = sql.toLowerCase();
-		sql = "select count(1) " + sql.substring(sql.indexOf("from"));
+		Pattern pattern = Pattern.compile("^\\s*select\\s+[\\s\\S]*?\\s+from");
+		Matcher matcher = pattern.matcher(sql.toLowerCase());
+		if (matcher.find()) {
+			String group = matcher.group();
+			sql = "select count(1) from " + sql.substring(group.length());
+			group.length();
+		} else {
+			throw new ReportException("SQL语法错误：" + sql);
+		}
+
 		PreparedStatement preparedStatement = connection.prepareStatement(sql);
 		ResultSet resultSet = preparedStatement.executeQuery();
 		resultSet.next();