方法一

原代码

sql +=" and FIND_IN_SET(s.M_ID,'" + ids + "')";
修改为 sql += " where s.M_ID"+getInSql(ids);

public static String getInSql(String ids) {String[] idArray = ids.split(",");StringBuilder sql = new StringBuilder(" IN (");for (int i = 0; i < idArray.length; i++) {// 直接将参数值添加到 SQL 片段中sql.append("'").append(idArray[i].trim()).append("'");if (i < idArray.length - 1) {sql.append(",");}}sql.append(")");return sql.toString();
}

缺点，FIND_IN_SET量大，需要改动多 

方案二观察到Jfinal所有需要执行的sql语句会经过Sqlite3Dialect,我们在Sqlite3Dialect类中重写sql语句，判断是sqlite数据库，且是否含FIND_IN_SET，继而进行修改替换FIND_IN_SET

@Override
public List<Record> dbFindForRecord(String sql, Object... paras) {/*System.out.println(sql);List<Record> list = Db.find(sql,paras);return list;*/String jdbcUrl = null;try {jdbcUrl = DbKit.getConfig().getDataSource().getConnection().getMetaData().getURL();} catch (SQLException e) {e.printStackTrace();}System.out.println("改动之前sql"+sql);if (jdbcUrl != null && jdbcUrl.contains("sqlite") && sql.contains("FIND_IN_SET")) {// 正则：FIND_IN_SET(\w+,\?(\d+)?\))  ->  INSTR(','||$2||',' , ','||$1||',')>0sql = sql.replaceAll("(?i)FIND_IN_SET\\s*\\(\\s*(\\w+)\\s*,\\s*\\?\\s*\\)","INSTR(','||?||',' , ','||$1||',')>0");}System.out.println("改动之后sql"+sql);return Db.find(sql, paras);}，其他调用可按如上例子修改，看自己需求