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在SQL中,NULL并不能采用 != 与数值进行比较,若要进行比较,我们只能采用 IS NULL 或 IS NOT NULL。 原因: NULL is used as a placeholder for unknown or inapplicable values, it is treated di 阅读全文
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1、 DBI下载地址:https://cpan.metacpan.org/authors/id/T/TI/TIMB/DBI-1.636.tar.gz 1.1 解压,编译: tar -zxvf DBI-1.636.tar.gzcd DBI-1.636perl Makefile.PLmakemake t 阅读全文
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1 char* trimChar( char *src ) 2 { 3 if( src == NULL ) 4 return src; 5 6 char *begin = src; 7 char *end = src + strlen( src ) -1; 8 9 while( *begin != 阅读全文