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string sql = "select * from userinfo where uname = '" + uname + "' and upassword = '" + upassword + "'";
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string sql = "select * from userinfo where uname = @uname and upassword = @upassword";
MySqlParameter[] paras = new MySqlParameter[]
{
new MySqlParameter("@uname",uname),
new MySqlParameter("@upassword",upassword)
};


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sql = "select * from userinfo where uname = @uname and upassword = @upassword";



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