private void AddColumns(StringBuilder sb)
{
if (Columns.Count == 0)
{
return;
}
sb.AppendLine();
foreach (gsSelectColumn selCol in Columns)
{
if (selCol is gsCaseColumn)
{
gsCaseColumn caseColumn = selCol as gsCaseColumn;
caseColumn.QueryName = QryName;
sb.Append(caseColumn.ToString());
}
else if (selCol is gsSubQueryColumn)
{
gsSelectQuery subQry = (selCol as gsSubQueryColumn).SubQuery;
subQry.QryName = $"subQry{GetNextID()}";
sb.AppendLine();
sb.AppendLine(subQry.ToString());
sb.Append($"{QryName}.Columns.Add(new SelectColumn(SqlExpression.SubQuery({subQry.QryName}), {selCol.ColumnAlias.Quoted()}));");
}
else
{
sb.Append($"{QryName}.Columns.Add(new SelectColumn({selCol.ToString()}));");
}
sb.AppendLine();
}
}
private void AddNestedCase(StringBuilder sb, gsCaseColumn caseColumn, string originCase)
{
caseColumn.CaseClauseName = "cc" + GetNextID();
sb.AppendLine($"CaseClause {caseColumn.CaseClauseName} = new CaseClause();");
foreach (gsCaseTerm caseTerm in caseColumn.CaseTerms)
{
sb.Append(caseTerm.When.ToString());
string thenStr;
if (caseTerm.Then is gsCaseColumn)
{
var caseCol = caseTerm.Then as gsCaseColumn;
caseCol.CaseOrigin = originCase;
AddNestedCase(sb, caseCol, CaseClauseName);
thenStr = $"SqlExpression.Case({caseCol.CaseClauseName})";
}
else
{
caseTerm.Then.ToStringUseExpression = true;
thenStr = caseTerm.Then.ToString();
}
sb.AppendLine($"{caseColumn.CaseClauseName}.Terms.Add(new CaseTerm({caseTerm.When.WhereClauseName}, {thenStr}));");
}
caseColumn.CaseAlias = ColumnAlias;
if (caseColumn.Else.ColumnIsValid())
{
caseColumn.CaseAlias = caseColumn.Else.ColumnAlias;
caseColumn.Else.ColumnAlias = null; // Messes up the case ElseValue
string tempElseStr = caseColumn.Else.ToString();
if (!tempElseStr.StartsWith("SqlExpression."))
{
tempElseStr = $"SqlExpression.Field({tempElseStr});";
}
sb.AppendLine($"{caseColumn.CaseClauseName}.ElseValue = {tempElseStr};");
}
}
