我正在尝试更新MS-Access数据库中的值。
直接输入Access时查询工作正常，但是当我尝试在C＃中更新它时，我得到“UPDATE子句中的语法错误”异常。
conMngr.ConnectionStr = ConfigurationManager.ConnectionStrings[_connectionStr].ConnectionString;
conMngr.OpenConnection();
try {
string query = "select Id, counter from tabAppCounter where userId=" + _userId.ToString() + " and appPath = '" + path + "'";
OleDbDataAdapter adapter = new OleDbDataAdapter(query, conMngr.DbCon);
DataSet ds = new DataSet();
adapter.Fill(ds);
dataGridView.DataSource = ds.Tables[0];
if (ds.Tables[0].Rows.Count != 0) {
int count = int.Parse(ds.Tables[0].Rows[0].ItemArray[1].ToString())+ 1;
string query2 = "UPDATE tabAppCounter set counter=@count where Id=@Id";
conMngr.OleDbcmd = new OleDbCommand(query2, conMngr.DbCon);
conMngr.OleDbcmd.Parameters.AddWithValue("@Id", ds.Tables[0].Rows[0].ItemArray[0].ToString());
conMngr.OleDbcmd.Parameters.AddWithValue("@count", count.ToString());
conMngr.OleDbcmd.ExecuteNonQuery();
}
} catch (Exception e) {
MessageBox.Show(e.Message + "\n\n" + e.StackTrace);
}
conMngr.CloseConnection();
在ExecuteNonQuery之后，此代码失败，并在UPDATE子句异常中出现语法错误。
我尝试使用预建的查询字符串，但这也不起作用。
答案 0 :(得分：5)
访问驱动程序（和Ole）不使用命名参数，它们是基于位置的。您传递参数的顺序和更新语句中的参数不匹配，这会给您一个错误。
您确实应该在更新字符串中使用*
{
margin: 0;
padding: 0;
}
p
{
font-family: 'Source Sans Pro', sans-serif;
font-size: 16px;
line-height: 19px;
color: #1e4164;
margin: 10px 10px;
}
.content-section-heading
{
font-family: 'Source Sans Pro', sans-serif;
font-size: 12px;
line-height: 12px;
color: #5c5c5c;
margin: 10px 10px;
font-weight: 600;
}
h1
{
font-size: 36px;
font-family: 'Source Sans Pro', sans-serif;
line-height: 122px;
color: #1e4164;
font-weight: 800;
text-align: center;
margin-top: 25px;
margin-bottom: 70px;
}
header
{
height: 127px;
width: 100%;
background-color: #569ABD;
box-shadow: rgba(80, 80, 80, 0.7) 1px 1px 2px 0px;
position: relative;
z-index: 2;
}
#header-fixedWidth
{
width: 1253px;
margin: 0 auto;
}
#header-fixedWidth img
{
margin-top: 3px;
}
#banner
{
width: 100%;
height: 772px;
display: block;
}
#main-content
{
display: block;
width: 100%;
height: 100%;
border: 1px solid black;
}
#mainContent-fixedWidth
{
width: 1253px;
height: 100%;
margin: 0 auto;
border: 1px solid #ccc;
}
.content
{
height:340px;
width: 220px;
background-color: white;
box-shadow: rgba(192, 192, 192, 0.8) 0px 10px 10px 0px;
float: left;
margin: 0px 0px 40px 30px;
}
.content #tempContentImage
{
height: 180px;
width: 222px;
}作为占位符。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>OECTA Template</title>
<link rel="stylesheet" href="style.css" />
<link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro" rel="stylesheet" />
</head>
<body>
<header>
<div id="header-fixedWidth">
<img src="Images/header/navigationMenu.png" alt="mainNavImage" id="mainNav" />
</div>
</header>
<div id="banner">
<img src="Images/Banner/BenefitsBanner.jpg" alt="bannerImage" id="bannerTemplate" />
</div>
<div id="main-content">
<div id="mainContent-fixedWidth">
<h1>Intranet</h1>
<div class="content">
<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
<div class="content">
<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
<div class="content">
<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
<div class="content">
<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
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<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
<div class="content">
<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
<div class="content">
<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
<div class="content">
<img src="Images/contentItems/briefNewsImage.jpg" alt="tempContentImage" id="tempContentImage" />
<p class="content-section-heading">Section Heading</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quis, obcaecati.</p>
</div>
</div>
</div>
</body>
</html>最后确保类型正确，传入的类型必须与数据库中的类型匹配。因此，如果?在两个地方都是int，则传递string query2 = "UPDATE tabAppCounter set counter=? where Id=?";
conMngr.OleDbcmd = new OleDbCommand(query2, conMngr.DbCon);
conMngr.OleDbcmd.Parameters.AddWithValue("@count", count.ToString());
conMngr.OleDbcmd.Parameters.AddWithValue("@Id", ds.Tables[0].Rows[0].ItemArray[0].ToString());
conMngr.OleDbcmd.ExecuteNonQuery();
而不是count
答案 1 :(得分：1)
希望这会对其他人有所帮助：这对我有用。
而不是
string query2 = "UPDATE tabAppCounter set counter=@count where Id=@Id";
我用过
string query2 = "UPDATE [tabAppCounter] set [counter]=@count where [Id]=@Id";
而且神奇地说，一切都开始正常运作了。