Home Backend Development PHP Tutorial PHP中查询SQL Server或Sybase时TEXT字段被截断的解决方法_php技巧

PHP中查询SQL Server或Sybase时TEXT字段被截断的解决方法_php技巧

May 17, 2016 am 09:33 AM
php server sql sybase Truncate

Author: Wenlong Wu
一、针对MS SQL SERVER数据库
   有两种解决方案,如下:
   修改php.ini来实现: 打开php.ini,可看到mssql.textsize,mssql.textlimit两个选项:

   ; Valid range 0 - 2147483647. Default = 4096.
   ;mssql.textlimit = 4096
   ; Valid range 0 - 2147483647. Default = 4096.
   ;mssql.textsize = 4096

   可以看到默认配置为4096字节,也就是经常碰到的被截断为4K,将之改为合适的大小,去掉前面的分号,然后保存并重起WEB服务器即可。
   从上面两个选项可看到范围为:0 - 2147483647字节,其实-1也可以的,查看一下PHP源代码即可发现-1表示无限制 :)
  
if (MS_SQL_G(textlimit) != -1) {
   sprintf(buffer, "%li", MS_SQL_G(textlimit));
   if (DBSETOPT(mssql.link, DBTEXTLIMIT, buffer)==FAIL) {
   efree(hashed_details);
   dbfreelogin(mssql.login);
   RETURN_FALSE;
   }
   }
   if (MS_SQL_G(textsize) != -1) {
   sprintf(buffer, "SET TEXTSIZE %li", MS_SQL_G(textsize));
   dbcmd(mssql.link, buffer);
   dbsqlexec(mssql.link);
   dbresults(mssql.link);
   }
   在PHP中查询之前执行SET TEXTSIZE 合适的大小: 只需在SELECT之前执行
   mssql_query("SET TEXTSIZE 65536");
   从上面PHP源代码中可看到其实也是执行SET TEXTSIZE的 :)
  二、针对Sybase数据库
   由于该扩展在php.ini没有像SQL SERVER那样的选项可配置,所以只有采用上面的第二种方法,即:
   在SELECT之前执行
   sybase_query("SET TEXTSIZE 65536");

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