/// <summary>
///
/// </summary>
public IDbSingleQuery From(IDataExpression expression)
{
FromClause = new DbQueryFromClause()
{
Expression = expression as DataExpression
};
return(this);
}
// From -------------------------------------
/// <summary>
///
/// </summary>
/// <param name="tables">The tables to consider.</param>
public IDbSingleQuery From(params DbTable[] tables)
{
if (FromClause == null)
{
FromClause = new DbQueryFromClause();
}
if (FromClause.Statements == null)
{
FromClause.Statements = new List <DbQueryFromStatement>();
}
FromClause.Statements.Add(new DbQueryFromStatement()
{
Tables = tables?.ToList()
});
return(this);
}
// From -------------------------------------
private string GetSqlText_FromClause(
IDbQueryFromClause clause,
IDbSingleQuery query = null,
DbQueryFromClauseKind kind = DbQueryFromClauseKind.FromPreffix,
IDataElementSet parameterSet = null,
IScriptVariableSet scriptVariableSet = null,
IBdoLog log = null)
{
string queryString = "";
if (query != null)
{
if (query.Kind == DbQueryKind.Insert)
{
if ((clause?.Statements?.Count == 1 &&
clause?.Statements[0]?.Tables.Any(p => p is DbDerivedTable) != true) ||
(query.WhereClause != null))
{
var subQuery = DbFluent.SelectQuery(null)
.WithFields(query.Fields?.ToArray());
subQuery.FromClause = query.FromClause;
subQuery.WhereClause = query.WhereClause;
clause = new DbQueryFromClause
{
Statements = new List <DbQueryFromStatement>()
};
clause.Statements.Add(new DbQueryFromStatement()
{
Tables = new List <DbTable>()
{
DbFluent.TableAsQuery(subQuery)
}
});
}
}
if (clause == null)
{
if (query.Kind == DbQueryKind.Insert)
{
var table = DbFluent.TableAsTuples(
DbFluent.Tuple(query.Fields?.ToArray()));
queryString += GetSqlText_Table(
table, query, parameterSet,
DbQueryTableMode.CompleteName,
query.DataModule, query.Schema,
scriptVariableSet: scriptVariableSet, log: log);
}
else if (query.Kind != DbQueryKind.Update)
{
queryString += GetSqlText_Table(
query.DataModule, query.Schema, query.DataTable, query.DataTableAlias,
DbQueryTableMode.CompleteName,
query.DataModule, query.Schema,
scriptVariableSet: scriptVariableSet, log: log);
}
}
else
{
if (clause?.Expression != null)
{
string expression = Scope?.Interpreter.Evaluate(clause.Expression, scriptVariableSet, log)?.ToString() ?? "";
queryString += expression;
}
else if (!(clause?.Statements?.Count > 0))
{
queryString += GetSqlText_Table(
query.DataModule, query.Schema, query.DataTable, query.DataTableAlias,
DbQueryTableMode.CompleteNameAsAlias,
query.DataModule, query.Schema,
scriptVariableSet: scriptVariableSet, log: log);
}
else
{
foreach (var statement in clause.Statements)
{
// if the first table is not a joined one then we add first the query's default table
if (statement.Tables == null || statement.Tables.Count == 0 || statement.Tables[0] is DbJoinedTable)
{
queryString += GetSqlText_Table(
query.DataModule, query.Schema, query.DataTable, query.DataTableAlias,
DbQueryTableMode.CompleteNameAsAlias,
query.DataModule, query.Schema,
scriptVariableSet: scriptVariableSet, log: log);
}
if (statement.Tables?.Count > 0)
{
var existingTbale = false;
foreach (var table in statement.Tables)
{
if (query?.Kind == DbQueryKind.Delete && table is DbJoinedTable joinedTable)
{
queryString += !existingTbale ? " using " : ", ";
queryString += GetSqlText_Table(
joinedTable.Table,
query, parameterSet, DbQueryTableMode.CompleteNameAsAlias,
scriptVariableSet: scriptVariableSet, log: log);
existingTbale = true;
// we update the where clause to add relationships
if (query?.WhereClause == null)
{
query.WhereClause = new DbQueryWhereClause();
}
if (query.WhereClause.Expression == null)
{
query.WhereClause.Expression = joinedTable.Condition;
}
else
{
query.WhereClause.Expression = DbFluent.And(query.WhereClause.Expression, joinedTable.Condition);
}
}
else
{
queryString += GetSqlText_Table(
table,
query, parameterSet, DbQueryTableMode.CompleteNameAsAlias,
query.DataModule, query.Schema,
scriptVariableSet: scriptVariableSet, log: log);
}
}
}
}
}
}
}
queryString = queryString.If(!string.IsNullOrEmpty(queryString),
(kind == DbQueryFromClauseKind.FromPreffix ? "from " : "") + queryString);
return(queryString);
}
