fetch column names for specific table
19,482
Solution 1
You can fetch schema information for a given query through OleDb using the SchemaOnly CommandBehavior and the GetSchemaTable method, as follows:
var conStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=NWIND.mdb";
using (var con = new OleDbConnection(conStr))
{
con.Open();
using (var cmd = new OleDbCommand("select * from Suppliers", con))
using (var reader = cmd.ExecuteReader(CommandBehavior.SchemaOnly))
{
var table = reader.GetSchemaTable();
var nameCol = table.Columns["ColumnName"];
foreach (DataRow row in table.Rows)
{
Console.WriteLine(row[nameCol]);
}
}
}
Solution 2
A variant of bubi's method for a specific table:
public List<string> GetTableColumnNames(string tableName)
{
var conStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=NWIND.mdb";
using (var connection = new OleDbConnection(conStr))
{
connection.Open();
var schemaTable = connection.GetOleDbSchemaTable(
OleDbSchemaGuid.Columns,
new Object[] { null, null, tableName });
if (schemaTable == null)
return null;
var columnOrdinalForName = schemaTable.Columns["COLUMN_NAME"].Ordinal;
return (from DataRow r in schemaTable.Rows select r.ItemArray[columnOrdinalForName].ToString()).ToList();
}
}
Of course first you might want to check if the table actually exists before getting its column names:
public bool TableExists(string tableName)
{
var conStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=NWIND.mdb";
using (var connection = new OleDbConnection(conStr))
{
connection.Open();
var tables = connection.GetSchema("Tables");
var tableExists = false;
for (var i = 0; i < tables.Rows.Count; i++)
{
tableExists = String.Equals(tables.Rows[i][2].ToString(),
tableName,
StringComparison.CurrentCultureIgnoreCase);
if (tableExists)
break;
}
return tableExists;
}
}
Solution 3
This retrieves all the columns of all tables and views
DataTable schemaTable = ((OleDbConnection)jetConnection).GetOleDbSchemaTable(
System.Data.OleDb.OleDbSchemaGuid.Columns,
new object[] { null, null, null, null });
Comments
-
krunal shah almost 2 years
I want to fetch all the column names for specific table..
I am using msaccess and C# .net 2008.
-
Muneem Habib over 8 yearssir its returning column names with lowercase like i have columnname = OBJECTID but it is returning objectid