private void dataTableColumns_ColumnChanged(
object sender, System.Data.DataColumnChangeEventArgs e)
{
/*
MessageBox.Show(
"ColumnName = " + e.Column.ColumnName +";\n" +
"ProposedValue = " + (e.ProposedValue!=null?e.ProposedValue:"<null>") + "\n" +
"RowState = " + e.Row.RowState,
"ColumnChanged");
*/
DataRow row = e.Row;
DataRowState rowState = e.Row.RowState;
MetaData.Column oldCol = null;
string oldColumnName = "";
string oldTableName = "";
string oldTableNameSpec= "";
Object obj; // work object
int index = DataRowIndex(row); // index into table
string columnName;
obj = row["Column Name"];
if (!Convert.IsDBNull(obj))
columnName = ((string)obj).Trim();
else
columnName = String.Empty;
if (columnName.Length != 0)
{
string aliasSpec;
obj = row["Alias"];
if (!Convert.IsDBNull(obj))
aliasSpec = (string)obj;
else
aliasSpec = String.Empty;
string tableSpec;
obj = row["Table"];
if (!Convert.IsDBNull(obj))
tableSpec = (string)obj;
else
tableSpec = String.Empty;
MetaData.Column newCol = new MetaData.Column();
newCol.ColumnName = columnName;
//newCol.TableName = tableSpec;
newCol.AliasName = aliasSpec;
newCol.AliasNameSpecification =
MetaData.WrapInQuotesIfEmbeddedSpaces(aliasSpec);
if (index != -1 &&
index < this.md.Columns.Count)
{
oldCol = (MetaData.Column)this.md.Columns[index];
if (oldCol != null)
{
if (oldCol.ColumnName != null)
oldColumnName = oldCol.ColumnName;
if (oldCol.TableName != null)
oldTableName = oldCol.TableName;
if (oldCol.TableNameSpecification != null)
oldTableNameSpec =
oldCol.TableNameSpecification;
}
}
int token;
StringBuilder sb = new StringBuilder(100);
if (oldCol != null)
{
token = oldCol.Token; // replacing old entry
token = this.md.RemoveToken(index);
}
else
token = this.md.TokenFROM; // adding new entry
// if inserting last col, need a preceding comma
if (index > 0 && index + 1 >= this.md.Columns.Count)
sb.Append(", "); // append leading comma
sb.Append(newCol.ToString());
// if we are not the last column then append a
// trailing comma. e.g. "mycol,"
if (index + 1 < this.md.Columns.Count)
sb.Append(","); // append trailing comma
this.md.CmdTokenList.Insert(token, sb.ToString());
}
else // columnName == String.Empty (treat as delete)
{
this.md.RemoveToken(index); // remove the column's token
}
// update the query text pane
UpdateQueryTextBox(this.md.CmdTokenList);
// rebuild the metadata
this.md = this.Connection.GetMetaData(this.textQuery.Text);
// update table property pages display
UpdateTableColumnCheckBoxList(md);
this.rebuildDataGrid = true; // rebuild the data grid later
}
// list of tables to expand from
/*
** ExpandSelectStarColumnReference method
**
** History:
** 28-Jan-03 (thoda04)
** Created.
** 30-sep-08 (thoda04)
** "SELECT *" must insert columns from all tables
** before removing * reference. Bug 120972.
*/
/// <summary>
/// Expand the "*" column reference in a SELECT *
/// to all of the columns defined in the table or tables.
/// </summary>
private void ExpandSelectStarColumnReference(
ArrayList columns, // array of columns that contains the "*" column
int index, // index into columns for the "*" column
ArrayList tablelist)
{
int starindex = index; // save the index of the "*" column
foreach(Table table in tablelist)
{
Catalog.Table catTable = table.CatTable;
if (catTable == null ||
catTable.Columns == null ||
catTable.Columns.Count == 0)
continue;
foreach (Catalog.Column catCol in catTable.Columns)
{
Column col = new MetaData.Column();
col.SchemaName = catCol.SchemaName;
col.TableName = catCol.TableName;
col.ColumnName = "*"; // indicate to GetSchemaTable() that
// this column is from "SELECT * ..."
if (table.AliasNameSpecification != null)
col.TableNameSpecification = table.AliasNameSpecification;
else
{
col.TableNameSpecification = table.TableNameSpecification;
if (table.SchemaNameSpecification != null)
col.SchemaNameSpecification =
table.SchemaNameSpecification;
}
col.Table = table; // Table reference in FROM list
columns.Insert(++index, col); // insert new column into list
} // end loop thru catalog columns for the table
} // end loop thru tables
if (index != starindex) // if new columns replaced "*" column
columns.RemoveAt(starindex); // remove the "*" column
else // for some strange reason (e.g. table not in database),
// couldn't replace columns
{
Column col = (Column)columns[starindex];
col.Clear(); // clear the strange "*" column
}
}
