基于JavaWeb的全JavaWeb数据库关键词搜索推荐方法

Question

我正试图通过JSP从我的整个keyword search数据库中实现一个MySQL，我很困惑我选择的方法是否效率低下：

我读过关于information_schema的文章，发现所有的列标签都在那里。

我尝试了下面的SQL语句来生成所有可能的查询：

SELECT CONCAT('SELECT * FROM ',table_schema,'.',table_name,
            ' WHERE ',column_name,' LIKE ','searchString',';')
      FROM information_schema.columns
      WHERE table_schema NOT IN ('information_schema','mysql','performance_schema')
      AND (column_type LIKE 'char(%'
      OR column_type LIKE 'varchar(%'
      OR column_type LIKE '%text')

并尝试了JSP代码以获得所有可能的数据匹配。

<%
    String searchString =   "malayalam";
            searchString        =   "''%"+searchString+"%'' ";    
            ArrayList<String> queries =   new ArrayList<String>();
            String sql="SELECT CONCAT('SELECT * FROM ',table_schema,'.',table_name,"
                + "' WHERE ',column_name,' LIKE ','"+searchString+"',';')"
                + "FROM information_schema.columns "
                + "WHERE table_schema NOT IN ('information_schema','mysql','performance_schema')"
                + "AND (column_type LIKE 'char(%'"
                + "OR column_type LIKE 'varchar(%'"
                + "OR column_type LIKE '%text')";
            try{
                DBConInfoSchema db =   new DBConInfoSchema();
                ResultSet rs    =   db.getData(sql);
                while(rs.next()){
                    queries.add(rs.getString(1));
                }
                for(int i=0;i<queries.size();i++){
                    DBConInfoSchema dCon    =   new DBConInfoSchema();
                    ResultSet rsDemo        =   dCon.getData(queries.get(i));
                    if(rsDemo.next()){
                        out.print("<br/>Data found n query-"+i+" ->     "+queries.get(i));
                    }
                    dCon.DBClose();
                }
            }catch(Exception w){
                out.print("excep<br/>"+w);
            }
%>

现在我得到了大量的查询列表。我很困惑它是好是坏？！在考虑效率的时候，这种方法是不是不好呢？

Answer 1

在查询生成部分中。

SELECT CONCAT('SELECT * FROM ',table_schema,'.',table_name,
            ' WHERE ',column_name,' LIKE ','searchString',';')
      FROM information_schema.columns
      WHERE table_schema NOT IN ('information_schema','mysql','performance_schema')
      AND (column_type LIKE 'char(%'
      OR column_type LIKE 'varchar(%'
      OR column_type LIKE '%text')

我已经更新了线路

WHERE table_schema NOT IN ('information_schema','mysql','performance_schema')

至

 WHERE table_schema IN ('<my_table_name>')

生成my_table_name中的所有搜索结果并保存到ArrayList并执行它们

ArrayList<String> queries =   new ArrayList<String>();
DBConInfoSchema db =   new DBConInfoSchema();
ResultSet rs    =   db.getData(sql_statement);
while(rs.next()){
  queries.add(rs.getString(1));
}

从那里我整理出所需的数据。

-Hope，这可能会对某些人有所帮助。

注:即使它对我有用，我仍然相信它的天真，纠正我，如果有更好的方法，你做到这一点