一个关于Oracle更新语句引发的时间字段类型的问题
想当初我在做一个ASP.NET网站的时候,用的是Oracle数据库更新数据。表里面的字段有int类型的,string类型的,还有date类型的,在
想当初我在做一个ASP.NET网站的时候,用的是Oracle数据库更新数据。表里面的字段有int类型的,string类型的,还有date类型的,在和asp.NET前台控件绑定更新的时候总是出现问题,我当时上网查了好多东西,总是看的模棱两可,,毕竟也是头一次接触操作Oracle。我把我最初写的更新贴出来(现在这个问题已经解决了),你们看看:
更新语句如下: sql = .txtname.Text.Trim(), this.txtip.Text.Trim(), this.txtport.Text.Trim(), this.txttime.Text.Trim(), this.txtlocation.Text.Trim(), this.txtinstalltime.Text.Trim(), this.DropDownList_tname.Text.Trim(), this.txtid.Text.Trim());
首先,出现的问题就是“类型”与“单引号”的问题,报的错误是,如下图:
这个错误是,ORA-01861: 文字与格式字符串不匹配。
可能是因为你那个表里面的time这一列,数据类型是date类型的。
你传递一个字符格式的内容进去以后,数据库不知道如何格式化这个字符信息为日期。
下面是一个网友提供的,错误重现的例子与解决的办法。在这里非常感谢他的热心帮助
SQL> create table test_time( time date ); 表已创建。 SQL> insert into test_time values(); insert into test_time values() * ERROR 位于第 1 行: ORA-01861: 文字与格式字符串不匹配 SQL> insert into test_time values(); insert into test_time values() * ERROR 位于第 1 行: ORA-01861: 文字与格式字符串不匹配 SQL> insert into test_time values( TO_DATE(, ) ); 已创建 1 行。
对于上面的更新语句,我总结如下:
string类型的可以加单引号,像r.name='{0}',r.ip='{1}',r.port='{2}'等等都是可以的;
int类型的在Oracle数据库更新语句中是不能加单引号的,像id='{7}'是不行的,应该去掉单引号改为id={7};
date类型可以加单引号,但不是像r.time='{3}'这样的,应该应用TO_DATE()来转换格式,如:r.time=to_date('{3}','yyyy-mm-dd')。asp.net前台控件中输入的是字符串类型的数据,更新的时候当然要转换成时间类型格式的,修改后的更新语句如下:
sql = , ), this.DropDownList_tname.Text.Trim(), this.txtid.Text.Trim());
最后,如果您还需要Oracle中TO_DATE格式的其它解答,下面的链接地址有详细的解说,相信一定能帮助您的。

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