string sql = "insert into brrowinfo(readernum,readername,booknum,bookname,brotime,shtime,brrowednum)values('" + this.textBox1.Text + "',d,'" + this.textBox2.Text + "',d1,'"+DateTime.Now.ToShortDateString()+"','"+s+"',j)";
string sql = "insert into brrowinfo(readernum,r
阅读背景：
C#至少一个参数没有指定值
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