[英]SQL query in C# (System.Data.OleDb.OleDbException: 'Syntax error (missing operator) in query expression)
[英]Message: System.Data.OleDb.OleDbException : Syntax error (missing operator) in query expression
public static void WriteData(string colName,string data)
{
using (OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Constants.FileName + ";Extended Properties=\"Excel 8.0;HDR=NO;IMEX=3;READONLY=FALSE\""))
{
// string query = String.Format("INSERT INTO [DataSet$]({0}) VALUES ({1})",colName, data);
string query = String.Format("INSERT INTO [DataSet$]({0}) VALUES ({1})", colName, data);
cn.Open();
OleDbCommand cmd = new OleDbCommand(query, cn);
cmd.Parameters.AddWithValue("@colName", colName);
cmd.Parameters.AddWithValue("@data", data);
cmd.ExecuteNonQuery();
cn.Close();
cn.Dispose();
}
}
您要做的是混合動態查詢生成和查詢參數。 您不能使用命令參數來填充查詢中的列名。 參數僅用於向查詢傳遞值。
所以你需要做的是,使用string.Format
僅用於在查詢中放置列名,並僅使用命令參數將數據傳遞給查詢。
public void WriteData(string colName, string data)
{
using (OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Constants.FileName + ";Extended Properties=\"Excel 8.0;HDR=NO;IMEX=3;READONLY=FALSE\""))
{
string query = string.Format("INSERT INTO [DataSet$] ({0}) VALUES (@data)", colName);
// The query variable will have following value assuming colName=token
//INSERT INTO [DataSet$] (token) VALUES (@data)
cn.Open();
//Now use OleDbCommand to pass value of @data to the query.
OleDbCommand cmd = new OleDbCommand(query, cn);
cmd.Parameters.AddWithValue("@data", data);
cmd.ExecuteNonQuery();
cn.Close();
}
}
這應該可以幫助您解決問題。
public static void UpdateData(string keyName,string colName,string data)
{
using (OleDbConnection connection = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Constants.FileName + ";Extended Properties=\"Excel 8.0;HDR=NO;IMEX=3;READONLY=FALSE\""))
{
// string query = String.Format("INSERT INTO [DataSet$]({0}) VALUES ({1})",colName, data);
connection.Open();
string commandString = String.Format("UPDATE [DataSet$] SET colName ='{0}' WHERE keyName = '{1}'",@data,@keyName);
OleDbCommand cmd = new OleDbCommand(commandString, connection);
cmd.Parameters.AddWithValue("@data", data);
cmd.Parameters.AddWithValue("@keyName", keyName);
connection.Close();
connection.Dispose();
}
}
}
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