Question

我有一个查询 - ＆gt;

LOAD DATA INFILE 'hello2.csv' 
INTO TABLE failure_report.master_entry
FIELDS TERMINATED BY ',' 
ENCLOSED BY '"'
LINES TERMINATED BY '\n' 
IGNORE 2 ROWS

在c ++中我有 - >

string h1="hello2.csv";
string h2;
ostringstream strstr;
strstr << "LOAD DATA INFILE'" << h1 << "'INTO TABLE failure_report.master_entry    FIELDS  TERMINATED BY'"<<","<<"'ENCLOSED BY '"<<'"'<<"'LINES TERMINATED BY '"<<"\n"<<" '  ignore 2 rows";
h2=strstr.str();
int query_state=mysql_query(con,h2.c_str());

mysql_query确实返回0但数据库未更新.mysql_error为null。

Answer 1

你缺少一些单词和撇号'之间的空格和\n的转义（它在C ++中也有特殊含义，只有文字新行被发送到mysql服务器，你必须使用{{ 1}}），尝试使用：

\\n

另请注意行尾的每个strstr << "LOAD DATA INFILE '" << h1 << "' " << "INTO TABLE failure_report.master_entry " << "FIELDS TERMINATED BY ',' " << "ENCLOSED BY '\"' " << "LINES TERMINATED BY '\\n' " << "IGNORE 2 ROWS";前的空格。

将来使用"和mysql_error()进行调试。

Answer 2

我认为问题在于您使用围绕语句打开和关闭'引号的方式，并且重新开始"。

strstr << "LOAD DATA INFILE '" << h1 << "' INTO TABLE failure_report.master_entry FIELDS  TERMINATED BY ',' ENCLOSED BY '\"' LINES TERMINATED BY '\\n' ignore 2 rows";

c ++中的动态mysql查询

2 个答案: