internal EntitySetExpression(TableExpression sourceTable, MemberInfo memberInfo, Type entitySetType, BuilderContext builderContext, ExpressionDispatcher dispatcher)
: base(ExpressionType, entitySetType)
{
this.builderContext = builderContext;
this.EntitySetType = entitySetType;
this.dispatcher = dispatcher;
this.sourceTable = sourceTable;
this.memberInfo = memberInfo;
ParseExpression(sourceTable);
}
IList <InputParameterExpression> BuildExpressionParameters(ExpressionChain expressions, QueryContext queryContext)
{
var builderContext = new BuilderContext(queryContext);
var previousExpression = ExpressionDispatcher.CreateTableExpression(expressions.Expressions[0], builderContext);
previousExpression = BuildExpressionQuery(expressions, previousExpression, builderContext);
BuildOffsetsAndLimits(builderContext);
// then prepare Parts for SQL translation
PrepareSqlOperands(builderContext);
return(builderContext.ExpressionQuery.Parameters);
}
/// <summary>
/// Builds and chains the provided Expressions
/// </summary>
/// <param name="expressions"></param>
/// <param name="builderContext"></param>
protected virtual void BuildExpressionQuery(ExpressionChain expressions, BuilderContext builderContext)
{
var previousExpression = ExpressionDispatcher.CreateTableExpression(expressions.Expressions[0], builderContext);
previousExpression = BuildExpressionQuery(expressions, previousExpression, builderContext);
BuildOffsetsAndLimits(builderContext);
// then prepare Parts for SQL translation
PrepareSqlOperands(builderContext);
// now, we optimize anything we can
OptimizeQuery(builderContext);
// finally, compile our object creation method
CompileRowCreator(builderContext);
// in the very end, we keep the SELECT clause
builderContext.ExpressionQuery.Select = builderContext.CurrentSelect;
}
/// <summary>
/// Returns a Delegate to create a row for a given IDataRecord
/// The Delegate is Func<IDataRecord,MappingContext,"tableType">
/// </summary>
/// <param name="tableType">The table type (must be managed by DataContext)</param>
/// <param name="parameters"></param>
/// <param name="queryContext"></param>
/// <returns></returns>
public virtual Delegate GetTableReader(Type tableType, IList <string> parameters, QueryContext queryContext)
{
Delegate reader = null;
if (queryContext.DataContext.QueryCacheEnabled)
{
reader = GetFromTableReaderCache(tableType, parameters);
}
if (reader == null)
{
var lambda = ExpressionDispatcher.BuildTableReader(tableType, parameters,
new BuilderContext(queryContext));
reader = lambda.Compile();
if (queryContext.DataContext.QueryCacheEnabled)
{
SetInTableReaderCache(tableType, parameters, reader);
}
}
return(reader);
}
/// <summary>
/// Builds the ExpressionQuery main Expression, given a Table (or projection) expression
/// </summary>
/// <param name="expressions"></param>
/// <param name="tableExpression"></param>
/// <param name="builderContext"></param>
/// <returns></returns>
protected Expression BuildExpressionQuery(ExpressionChain expressions, Expression tableExpression, BuilderContext builderContext)
{
tableExpression = ExpressionDispatcher.Analyze(expressions, tableExpression, builderContext);
ExpressionDispatcher.BuildSelect(tableExpression, builderContext);
return(tableExpression);
}
