protected override void GenerateJoin(ParameterDependant dependant, ref CharWriteBuffer sb)
{
foreach (var child in dependant.Dependants.Values)
{
if (child.ModelDetail.IdentityProperties.Count != 1)
{
throw new NotSupportedException($"Relational queries support only one identity on {child.ModelDetail.Type.GetNiceName()}");
}
var dependantIdentity = child.ModelDetail.IdentityProperties[0];
sb.Write("JOIN`");
sb.Write(child.ModelDetail.DataSourceEntityName);
sb.Write("`ON`");
sb.Write(dependant.ModelDetail.DataSourceEntityName);
sb.Write("`.`");
sb.Write(child.ParentMember?.ForeignIdentity);
sb.Write("`=`");
sb.Write(child.ModelDetail.DataSourceEntityName);
sb.Write("`.`");
sb.Write(dependantIdentity.PropertySourceName);
sb.Write('`');
AppendLineBreak(ref sb);
GenerateJoin(child, ref sb);
}
}
protected void Convert(ref CharWriteBuffer sb, QueryOperation select, Expression where, QueryOrder order, int?skip, int?take, Graph graph, ModelDetail modelDetail, MemberContext operationContext)
{
var hasWhere = where != null;
var hasOrderSkipTake = (select == QueryOperation.Many || select == QueryOperation.First) && (order?.OrderExpressions.Length > 0 || skip > 0 || take > 0);
GenerateSelect(select, graph, modelDetail, ref sb);
GenerateFrom(modelDetail, ref sb);
if (hasWhere || hasOrderSkipTake)
{
var rootDependant = new ParameterDependant(modelDetail, null);
var sbWhereOrder = new CharWriteBuffer();
try
{
if (hasWhere)
{
GenerateWhere(where, ref sbWhereOrder, rootDependant, operationContext);
}
if (hasOrderSkipTake)
{
GenerateOrderSkipTake(order, skip, take, ref sbWhereOrder, rootDependant, operationContext);
}
GenerateJoin(rootDependant, ref sb);
sb.Write(sbWhereOrder);
}
finally
{
sbWhereOrder.Dispose();
}
}
GenerateEnding(select, graph, modelDetail, ref sb);
}
protected override void GenerateOrderSkipTake(QueryOrder order, int?skip, int?take, ref CharWriteBuffer sb, ParameterDependant rootDependant, MemberContext operationContext)
{
if (order?.OrderExpressions.Length > 0)
{
sb.Write("ORDER BY");
var hasOrder = false;
foreach (var orderExp in order.OrderExpressions)
{
var context = new BuilderContext(rootDependant, operationContext);
if (hasOrder)
{
sb.Write(',');
}
else
{
hasOrder = true;
}
ConvertToSql(orderExp.Expression, ref sb, context);
if (orderExp.Descending)
{
sb.Write("DESC");
}
}
AppendLineBreak(ref sb);
}
else if (skip.HasValue || take.HasValue)
{
sb.Write("ORDER BY CURRENT_TIMESTAMP");
AppendLineBreak(ref sb);
}
if (skip.HasValue || take.HasValue)
{
sb.Write("OFFSET ");
sb.Write(skip ?? 0);
sb.Write(" ROWS");
AppendLineBreak(ref sb);
if (take.HasValue)
{
sb.Write("FETCH NEXT ");
sb.Write(take.Value);
sb.Write(" ROWS ONLY");
AppendLineBreak(ref sb);
}
}
}
protected override void GenerateWhere(Expression where, ref CharWriteBuffer sb, ParameterDependant rootDependant, MemberContext operationContext)
{
if (where == null)
{
return;
}
sb.Write("WHERE");
var context = new BuilderContext(rootDependant, operationContext);
ConvertToSql(where, ref sb, context);
AppendLineBreak(ref sb);
}
protected override void ConvertToSqlParameterModel(ModelDetail modelDetail, ref CharWriteBuffer sb, BuilderContext context, bool parameterInContext)
{
var member = context.MemberContext.MemberAccessStack.Pop();
var modelProperty = modelDetail.GetProperty(member.Member.Name);
if (modelProperty.IsDataSourceEntity && context.MemberContext.MemberAccessStack.Count > 0)
{
var subModelInfo = ModelAnalyzer.GetModel(modelProperty.InnerType);
context.MemberContext.ModelStack.Push(subModelInfo);
if (parameterInContext)
{
var parentDependant = context.MemberContext.DependantStack.Peek();
if (!parentDependant.Dependants.TryGetValue(subModelInfo.Type, out ParameterDependant dependant))
{
dependant = new ParameterDependant(subModelInfo, modelProperty);
parentDependant.Dependants.Add(subModelInfo.Type, dependant);
}
context.MemberContext.DependantStack.Push(dependant);
}
ConvertToSqlParameterModel(subModelInfo, ref sb, context, parameterInContext);
if (parameterInContext)
{
context.MemberContext.DependantStack.Pop();
}
context.MemberContext.ModelStack.Pop();
}
else if (context.MemberContext.InCallNoRender > 0)
{
}
else if (context.MemberContext.InCallRenderIdentity > 0)
{
if (modelDetail.IdentityProperties.Count != 1)
{
throw new NotSupportedException($"Relational queries support only one identity on {modelDetail.Type.GetNiceName()}");
}
var modelIdentity = modelDetail.IdentityProperties[0];
sb.Write('`');
sb.Write(modelDetail.DataSourceEntityName);
sb.Write("`.`");
sb.Write(modelIdentity.PropertySourceName);
sb.Write("`");
}
else
{
bool closeBrace = false;
if (context.MemberContext.MemberAccessStack.Count > 0)
{
bool memberPropertyHandled = false;
var memberProperty = context.MemberContext.MemberAccessStack.Pop();
if (member.Type.Name == typeof(Nullable <>).Name && memberProperty.Member.Name == "Value")
{
memberPropertyHandled = true;
}
else if (member.Type == typeof(DateTime))
{
memberPropertyHandled = true;
closeBrace = true;
switch (memberProperty.Member.Name)
{
case "Year":
sb.Write("YEAR(");
break;
case "Month":
sb.Write("MONTH(");
break;
case "Day":
sb.Write("DAY(day,");
break;
case "Hour":
sb.Write("HOUR(");
break;
case "Minute":
sb.Write("MINUTE(");
break;
case "Second":
sb.Write("SECOND(");
break;
case "Millisecond":
sb.Write("1/1000*MICROSECOND(");
break;
case "DayOfYear":
sb.Write("DAYOFYEAR(");
break;
case "DayOfWeek":
sb.Write("WEEKDAY(");
break;
default:
memberPropertyHandled = false;
break;
}
}
if (!memberPropertyHandled)
{
throw new NotSupportedException($"{member.Member.Name}.{memberProperty.Member.Name} not supported");
}
context.MemberContext.MemberAccessStack.Push(memberProperty);
}
sb.Write('`');
sb.Write(modelDetail.DataSourceEntityName);
sb.Write('`');
sb.Write('.');
sb.Write('`');
sb.Write(modelProperty.PropertySourceName);
sb.Write('`');
var lastOperator = context.MemberContext.OperatorStack.Peek();
if (lastOperator == Operator.And || lastOperator == Operator.Or)
{
if (modelProperty.InnerType == typeof(bool))
{
sb.Write("=1");
}
else
{
sb.Write("IS NOT NULL");
}
}
if (closeBrace)
{
sb.Write(')');
}
}
context.MemberContext.MemberAccessStack.Push(member);
}
public BuilderContext(ParameterDependant rootDependant, MemberContext memberContext)
{
this.RootDependant = rootDependant;
this.MemberContext = memberContext;
this.InvertStack = 0;
}
