如何PDF转换成文字信息

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select * from tbl_Articles WHERE ArticleID=2117226 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2117226 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2117226 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2424587,1078903,1051075,202687,1526372,1464041,300344,1069557,1128957,1609567,1953427,3344980,675902,1395009,1052195,1105345,3054936,1076936,3118592,3364834,2169744,806857,1391263,1379976,603915,2771935,1074298,1099605,634909,2205760) ORDER BY field (ArticleID,2424587,1078903,1051075,202687,1526372,1464041,300344,1069557,1128957,1609567,1953427,3344980,675902,1395009,1052195,1105345,3054936,1076936,3118592,3364834,2169744,806857,1391263,1379976,603915,2771935,1074298,1099605,634909,2205760)