private void IIfStatement(CaseExpression expression, int expNumber)
{
_Query.Append(" IIF( ");
expression.ExpressionToEval.Accept(this);
_Query.Append(" = ");
expression.TestExpressions[expNumber].TestExpression.Accept(this);
_Query.Append(", ");
expression.TestExpressions[expNumber].TestResult.Accept(this);
_Query.Append(", ");
if (expNumber < expression.TestExpressions.Count - 1)
IIfStatement(expression, expNumber + 1);
else if(expression.DefaultResult != null)
expression.DefaultResult.Accept(this);
_Query.Append(") ");
}
public override void Visit(CaseExpression expression)
{
IIfStatement(expression, 0);
if (expression.Alias != null && expression.Alias != string.Empty)
_Query.Append(FormatTableAlias(expression.Alias)).Append(" ");
}
public override void Visit(CaseExpression expression)
{
_Query.Append(SPACE).Append(DECODE).Append(OPENBRACE);
expression.ExpressionToEval.Accept(this);
_Query.Append(COMMA);
foreach (CaseTest cs in expression.TestExpressions)
{
cs.TestExpression.Accept(this);
_Query.Append(COMMA);
cs.TestResult.Accept(this);
_Query.Append(COMMA);
}
if (expression.DefaultResult != null)
expression.DefaultResult.Accept(this);
else
_Query.Append(NULL);
_Query.Append(CLOSEBRACE);
if (expression.Alias != null && expression.Alias != string.Empty)
_Query.Append(FormatTableAlias(expression.Alias)).Append(SPACE);
}
/// <summary>
/// Get an ISqlExpression which correspond to one entity mapping
/// This method process the opath constraint
/// This method doesn't not process the children of an entity
/// </summary>
/// <param name="query"></param>
/// <param name="attributes"></param>
/// <param name="baseType">In the case of a table per hierarchy mapping, the "in" predicates computes all the children from the base</param>
/// <param name="orderById"></param>
/// <returns></returns>
public ISQLExpression TransformToSql(Path path, StringCollection attributes, bool orderById, bool lastIsAttribute)
{
// Exception management : path
if (path == null)
throw new ArgumentNullException("path");
// Exception management : identifier
if (path.Identifiers.Count == 0)
throw new ArgumentNullException("path", "Must have at least one Identifier");
ConvertToSQL(path, true, false, lastIsAttribute);
// Restore context
SelectStatement currentQuery = (SelectStatement)queryContext.Peek();
Table currentTable = (Table)tableContext.Peek();
EntityMapping entityMapping = (EntityMapping)entityMappingContext.Peek();
// Always add the Type and Id in the SQL query
SelectStatement s = (SelectStatement)queryContext.Peek();
string childType = string.Empty;
string parenttype = string.Empty;
if (path.Identifiers.Count == 1)
childType = path.Identifiers[0].Value;
else
{
string refName = path.Identifiers[path.Identifiers.Count - 1].Value;
parenttype = string.Empty; //= query.Path.Identifiers[0].Value;
// Get the parent type: the type which corresponds to the refName
string nextRef = string.Empty;// query.Path.Identifiers[1].Value;
string nextType = path.Identifiers[0].Value;
for (int i = 1; i < path.Identifiers.Count - 1; i++)
{
nextRef = path.Identifiers[i].Value;
Evaluant.Uss.Models.Reference nextRefModel = _Model.GetReference(nextType, nextRef);
// Try to get the reference model in the parent type
if (nextRefModel == null)
{
Evaluant.Uss.Models.Entity currentE = _Model.GetEntity(nextType);
while (_Model.GetParent(currentE) != null)
{
currentE = _Model.GetParent(currentE);
nextRefModel = _Model.GetReference(currentE.Type, nextRef);
if (nextRefModel != null)
break;
}
}
if (nextRefModel == null)
throw new SqlMapperException(string.Concat("Cannot find the reference ", refName, " in the model of the entity ", nextType));
nextType = nextRefModel.ChildType;
}
parenttype = nextType;
//if (_Model.GetReference(parenttype, refName) == null)
//{
// Evaluant.Uss.Models.Entity current = Model.GetEntity(parenttype);
// while (Model.GetParent(current) != null)
// {
// current = Model.GetParent(current);
// parenttype = current.Type;
// if (_Model.GetReference(parenttype, refName) != null)
// break;
// }
//}
Evaluant.Uss.Models.Reference r = _Model.GetReference(parenttype, refName);
if (r == null)
{
Evaluant.Uss.Models.Attribute a = _Model.GetAttribute(parenttype, refName);
if (a == null)
{
throw new SqlMapperException("Cannot find " + refName + " in the '" + parenttype + "' model");
}
childType = parenttype;
}
else
{
childType = r.ChildType;
}
if (_Model.GetReference(parenttype, refName) == null && _Model.GetAttribute(parenttype, refName) == null)
throw new SqlMapperException("Cannot find " + refName + " in the '" + parenttype + "' model");
if (_Model.GetReference(parenttype, refName) != null)
childType = _Model.GetReference(parenttype, refName).ChildType;
if (_Model.GetAttribute(parenttype, refName) != null)
childType = parenttype;
}
if (path.Identifiers.Count == 1 || lastIsAttribute)
{
// Generates a specific query if a discriminator field is set
if (entityMapping.DiscriminatorField != null && entityMapping.DiscriminatorField != string.Empty)
{
CaseExpression caseExp = new CaseExpression(null, new Column(entityMapping, currentTable.TableAlias, entityMapping.DiscriminatorField), TYPE_ALIAS);
caseExp.DefaultResult = new Column(entityMapping, currentTable.TableAlias, entityMapping.DiscriminatorField);
// Generates a case for each discriminator value which is different to the real type
foreach (Models.Entity e in _Model.GetTree(entityMapping.Type))
{
string discriminatorValue = _Mapping.Entities[e.Type].DiscriminatorValue;
if (discriminatorValue != e.Type)
{
caseExp.TestExpressions.Add(new CaseTest(new Constant(discriminatorValue, DbType.String), new Constant(e.Type, DbType.String)));
}
}
// Determines wether the select should transform the discriminator values to real types (needed by the entity isntanciator)
if (caseExp.TestExpressions.Count > 0)
{
s.SelectList.Insert(0, caseExp);
}
else // If no type conversion has to be done, just write the discriminator-field alias
{
s.SelectList.Insert(0, new Column(entityMapping, currentTable.TableAlias, entityMapping.DiscriminatorField, TYPE_ALIAS));
}
}
else
{
s.SelectList.Insert(0, new Constant(childType, DbType.AnsiStringFixedLength, TYPE_ALIAS));
}
bool idFieldInserted = false;
foreach (ISQLExpression exp in s.SelectList)
{
Column id = exp as Column;
if (id != null && id.ColumnName == entityMapping.GetIdField(entityMapping.Ids[0]))
{
idFieldInserted = true;
if (id.Alias == null || id.Alias == String.Empty)
id.Alias = entityMapping.GetIdFieldAs(entityMapping.Ids[0]);
break;
}
}
if (!idFieldInserted)
{
for (int i = 0; i < entityMapping.Ids.Count; i++)
s.SelectList.Insert(Math.Min(1 + i, s.SelectList.Count), new Column(entityMapping.Ids[i], currentTable.TableAlias, entityMapping.GetIdField(entityMapping.Ids[i]), entityMapping.GetIdFieldAs(entityMapping.Ids[i])));
}
}
else
{
s.SelectList.Insert(0, new Column(null, currentTable.TableAlias, TYPE_ALIAS, TYPE_ALIAS));
EntityMapping parentMapping = _Mapping.Entities[parenttype];
int pos = 2;
if (parentMapping != null)
{
pos += parentMapping.Ids.Count - 1;
for (int i = 0; i < parentMapping.Ids.Count; i++)
{
PrimaryKeyMapping pmk = parentMapping.Ids[i];
string parentIdAlias = GetParentIdAlias(parentMapping, pmk.Field);
s.SelectList.Insert(1 + i, new Column(pmk, currentTable.TableAlias, parentIdAlias, parentIdAlias));
}
}
for (int i = 0; i < entityMapping.Ids.Count; i++)
{
PrimaryKeyMapping pmk = entityMapping.Ids[i];
if (currentTable is SelectStatement)
s.SelectList.Insert(pos + i, new Column(pmk, currentTable.TableAlias, entityMapping.GetIdFieldAs(pmk), entityMapping.GetIdFieldAs(pmk)));
else
s.SelectList.Insert(pos + i, new Column(pmk, currentTable.TableAlias, entityMapping.GetIdField(pmk), entityMapping.GetIdFieldAs(pmk)));
}
}
// FROM entity_table e{n}
if (!currentQuery.FromClause.Contains(currentTable))
currentQuery.FromClause.Add(currentTable);
// If attributes == null => don't load
if (attributes != null)
{
_IsFirstAttribute = true;
StringCollection processedAttributes = new StringCollection();
// rule1: alias in selectList are specified only if field name is different than attribute name
// if it is the case we use the attribute name as alias
// rule2: if more than one item have the same attribute name, add an index number at the end of 2nd, ..., n
// rule3: use a hashtable to do the correspondance between the alias and the attributeName
// rule4: above rules has to be done only for the first select list in case of union query
foreach (string attName in attributes)
{
string attNameAlias = attName.Substring(attName.LastIndexOf(DOT) + 1);
string shortAttName = attNameAlias;
AttributeMapping am = entityMapping.Attributes[shortAttName];
if (am == null)
continue;
PrimaryKeyMapping pkm = entityMapping.Ids[am.Field, false];
if (pkm == null || pkm.Generator.Name != GeneratorMapping.GeneratorType.business)
continue;
attNameAlias = entityMapping.GetIdFieldAs(pkm);
bool exists = false;
foreach (ISQLExpression expr in currentQuery.SelectList)
{
if (expr as Column == null)
continue;
if ((expr as Column).Alias == attNameAlias)
{
exists = true;
break;
}
}
if (exists)
continue;
ISQLExpression expression = ProcessAttributes(entityMapping, shortAttName, true);
if (expression is Column)
((Column)expression).Alias = attNameAlias;
currentQuery = (SelectStatement)queryContext.Peek();
int index = -1;
foreach (ISQLExpression expr in currentQuery.SelectList)
{
Column col = expr as Column;
if (col != null && col.Alias == attNameAlias)
{
index = currentQuery.SelectList.IndexOf(expr);
break;
}
Constant cst = expr as Constant;
if (cst != null && cst.Alias == attNameAlias)
{
index = currentQuery.SelectList.IndexOf(expr);
break;
}
}
if (index != -1)
currentQuery.SelectList.RemoveAt(index);
currentQuery.SelectList.Add(expression);
}
foreach (string attName in attributes)
{
string attNameAlias = attName.Substring(attName.LastIndexOf(DOT) + 1);
string shortAttName = attNameAlias;
AttributeMapping am = entityMapping.Attributes[shortAttName];
EntityMapping em = entityMapping;
// if am is null, ask child mapping
if (am == null)
{
string attType = attName.Substring(0, attName.IndexOf(DOT));
// if the attribute was found in another hierarchy, use a NULL value (case of TPCC when two hierarchies inherit from an absctract class)
if (_Model.GetTree(entityMapping.Type).Contains(attType))
{
foreach (Models.Entity entity in _Model.GetTree(attType))
{
EntityMapping childMapping = _Mapping.Entities[entity.Type];
if (childMapping != null)
{
AttributeMapping tmpAm = childMapping.Attributes[shortAttName];
if (tmpAm != null)
{
am = tmpAm;
em = childMapping;
break;
}
}
}
}
//if (childMapping.Type != entityMapping.Type && childMapping.Table == entityMapping.Table)
//{
// am = childMapping.Attributes[shortAttName];
// if (am != null)
// em = childMapping;
//}
}
// if duplicated attribute name, add an incremented index at the end (if not already done)
if (!_IsAliasColumnComputed)
{
foreach (string colName in _AliasColumnMapping.Values)
{
if (colName == shortAttName)
{
if (!_AliasColumnMapping.Contains(attName))
{
attNameAlias += ++_AliasColumnIndexNumber;
_AliasColumnMapping.Add(attName, attNameAlias);
}
else
attNameAlias = _AliasColumnMapping[attName].ToString();
break;
}
}
}
else
{
// get the previous computed alias
if (_AliasColumnMapping[attName] != null)
attNameAlias = _AliasColumnMapping[attName].ToString();
}
if (am != null)
{
// If attribute exists in mapping: add a column to the query
ISQLExpression expression = null;
// check if is imbricate table
if (currentTable is SelectStatement)
expression = ProcessAttributes(em, shortAttName, true, true);
else
expression = ProcessAttributes(em, shortAttName, true);
// check if alias is needed or not
if (attNameAlias != am.Field)
{
if (expression is Column)
{
((Column)expression).Alias = attNameAlias;
}
else if (expression is Constant)
{
((Constant)expression).Alias = attNameAlias;
}
}
currentQuery = (SelectStatement)queryContext.Peek();
int index = -1;
foreach (ISQLExpression expr in currentQuery.SelectList)
{
Column col = expr as Column;
if (col != null && col.Alias == attNameAlias)
{
index = currentQuery.SelectList.IndexOf(expr);
break;
}
Constant cst = expr as Constant;
if (cst != null && cst.Alias == attNameAlias)
{
index = currentQuery.SelectList.IndexOf(expr);
break;
}
}
if (index != -1)
currentQuery.SelectList.RemoveAt(index);
currentQuery.SelectList.Add(expression);
}
else
{
// If attribute doesn't exists in mapping: add a constant instead of
// a column so that we can build a UNION
currentQuery = (SelectStatement)queryContext.Peek();
Models.Attribute found = null;
Models.Entity foundEntity = null;
foreach (Models.Entity e in _Model.GetTree(entityMapping.Type))
{
foreach (Models.Attribute a in e.Attributes)
{
if (a.Name == attNameAlias)
{
found = a;
foundEntity = e;
break;
}
}
if (found != null)
{
break;
}
}
// If the attribute is in a sub class, select NULL for the current UNION, the column instead
if (found != null && foundEntity.Type == entityMapping.Type)
{
AttributeMapping foundMapping = _Mapping.Entities[foundEntity.Type].Attributes[found.Name];
if (foundMapping == null)
continue;
currentQuery.SelectList.Add(new Column(null, currentTable.TableAlias, foundMapping.Field, foundMapping.Name));
}
else
{
currentQuery.SelectList.Add(new Constant(DBNull.Value, DbType.AnsiStringFixedLength, attNameAlias));
}
}
// Store the correspondance between the alias/column name and the attribute name
if (!_IsAliasColumnComputed && !_AliasColumnMapping.Contains(attName))
_AliasColumnMapping.Add(attName, attNameAlias);
}
}
return (SelectStatement)queryContext.Peek();
}
public virtual void Visit(CaseExpression expression)
{
_Query.Append(CASE);
expression.ExpressionToEval.Accept(this);
foreach (CaseTest cs in expression.TestExpressions)
{
_Query.Append(SPACE).Append(WHEN);
cs.TestExpression.Accept(this);
_Query.Append(SPACE).Append(THEN);
cs.TestResult.Accept(this);
}
if (expression.DefaultResult != null)
{
_Query.Append(SPACE).Append(ELSE);
expression.DefaultResult.Accept(this);
}
_Query.Append(SPACE).Append(END);
if (expression.Alias != null && expression.Alias != string.Empty)
_Query.Append(FormatTableAlias(expression.Alias)).Append(SPACE);
}