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ASP.NET 1.0 and 1.1 Basics ASP.NET discussion for users new to coding in ASP.NET 1.0 or 1.1. NOT for the older "classic" ASP 3 or the newer ASP.NET 2.0. |
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December 3rd, 2004, 09:35 PM
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Syntax error in INSERT INTO statement
Hi all.
My code is generated via a method in a class called DBTool. In this code snippet I'll use an object of that class called myTool:
Code:
string []fieldNames = {"CustomerType", "Name", "Password", "Address", "ZipCode", "City",
"Phone", "EMail", "PaymentRecord", "CreditAmount", "Balance"};
object [] values = {0 , "Hans", "goggle", "Baldersgade 123", "2200", "Copenhagen",
"298120843", "007-is-his-iq@ofir.dk", 0, 5000.00m, 0.00m};
//string []fieldNames = {"BookID", "Comment"};
//object [] values = {3, "Fantastisk hvis det virker!"};
//IsInDB = myTool.Insert("Comments", fieldNames, values);
IsInDB = myTool.Insert("Customers", fieldNames, values);
The commented code works fine..
The Insert method creates an INSERT INTO SQL string:
Code:
public bool Insert(string table, string[] schema, params object[] fields)
{
if (schema.Length != fields.Length)
throw new ArgumentException("The number of fields does not match the size of the schema.");
string query = "INSERT INTO " + table + " (";
for (int i = 0; i < schema.Length; i++)
{
query += schema[i];
if (i != schema.Length - 1)
query += ", ";
}
query += ") VALUES (";
for (int i = 0; i < fields.Length; i++)
{
query += Formatted(fields[i]);
if (i != fields.Length -1)
query += ", ";
}
query += ")";
return this.ExplicitNonQuery(query);
}
The values a define as fields and formatted via the method Formatted:
Code:
protected override string Formatted(object obj)
{
switch(Convert.ToString(obj.GetType()))
{
case "System.Int32":
return ((int)obj).ToString();
case "System.String":
return "'" + (string)obj + "'";
case "System.Byte":
return ((byte)obj).ToString();
case "System.Boolean":
return (bool)obj ? "1" : "0";
case "System.Decimal":
return Convert.ToString(obj);
case "System.Double":
return Convert.ToString(obj);
case "System.DBNull":
return "NULL";
default:
// There is an unhandled conversion
throw new MyException("Total crab: " + obj.ToString() + "
er af typen " + obj.GetType());
return obj.ToString();
}
The last line of code (default:) courses an Exeption, I know that so I throw an error. Just to see if I use some data types I don't convert. The last thing I do is executing the SQL string against the db:
Code:
public bool ExplicitNonQuery(string query)
{
if (query.Length > 0)
{
int RowsAffected;
this.command.CommandText = query;
/* INSERT INTO Customers (CustomerType, Name, Password, Address,
ZipCode, City, Phone, EMail, PaymentRecord, CreditAmount, Balance)
VALUES (0, 'Hans','fasd', 'engade 2', '2123', 'Hornbæk', '29800843',
'jon_ronnenberg@hotmail.dk',0, 100, 0);
*/
OleDbTransaction trans = onnection.BeginTransaction(IsolationLevel.ReadCommitted);
this.command.Transaction = trans;
try
{
RowsAffected = this.command.ExecuteNonQuery();
trans.Commit();
return RowsAffected>0;
}
catch (Exception ex)
{
try
{
trans.Rollback();
throw new MyException(ex.Message, ex.Source);
// return false;
}
catch(OleDbException OleDbex)
{
throw new MyException(OleDbex.Message, OleDbex.InnerException);
}
}
}
else
{
throw new MyException("query is empty");
}
}
Yet again the commented code works, but only if I run it inside Access. I tried unescaping the query field (like this @), right before I ship it to ExplicitNonQuery but in vain. If anyone can pick up on this code flaw I would greatly appreciate it. This code is due on monday, so I got little time. Thanks in advance.
- mega
- mega
Moving to C# .NET
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December 4th, 2004, 05:56 AM
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Wrox Author
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Join Date: Jun 2003
Posts: 17,089
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What error do you get? And how does the final SQL statement look like before you pass it to the database?
Cheers,
Imar
---------------------------------------
Imar Spaanjaars
Everyone is unique, except for me.
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December 4th, 2004, 10:35 AM
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Friend of Wrox
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Hi Imar.
I get an OleDbExeption with the message: Syntax error in INSERT INTO statement. and the source says: Microsoft JET Database Engine
My SQL string look like this: INSERT INTO Customers (CustomerType, Name, Password, Address, ZipCode, City, Phone, EMail, PaymentRecord, CreditAmount, Balance) VALUES (0, 'Hans', 'goggle', 'Baldersgade 123', '2200', 'København', '298120843', '007-is-his-iq@ofir.dk', 0, 5000, 0) (printed out into a txt file).
I can't spot any error in the SQL but then again maybe it's just me.
- mega
Moving to C# .NET
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January 12th, 2005, 04:30 PM
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Join Date: Jun 2003
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JET got some reserved keywords like Name and Password. When I renamed all the fields it worked out..
Thanks anyway.
- mega
Moving to C# .NET
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