/*
* Binary
*/
/// <summary>
///
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="expression"></param>
/// <returns></returns>
private static QueryGroup Parse <TEntity>(BinaryExpression expression)
where TEntity : class
{
// Check directness
if (IsDirect(expression))
{
return(new QueryGroup(QueryField.Parse <TEntity>(expression)));
}
// Variables
var leftQueryGroup = Parse <TEntity>(expression.Left);
// IsNot
if (expression.Right.Type == StaticType.Boolean && expression.IsExtractable() == true)
{
var rightValue = (bool)expression.Right.GetValue();
var isNot = (expression.NodeType == ExpressionType.Equal && rightValue == false) ||
(expression.NodeType == ExpressionType.NotEqual && rightValue == true);
leftQueryGroup?.SetIsNot(isNot);
}
else
{
var rightQueryGroup = Parse <TEntity>(expression.Right);
return(new QueryGroup(new[] { leftQueryGroup, rightQueryGroup }, GetConjunction(expression)));
}
// Return
return(leftQueryGroup);
}
/// <summary>
///
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="expression"></param>
/// <param name="unaryNodeType"></param>
/// <returns></returns>
private static QueryGroup Parse <TEntity>(MethodCallExpression expression,
ExpressionType?unaryNodeType = null)
where TEntity : class
{
var queryFields = QueryField.Parse <TEntity>(expression, unaryNodeType);
return(queryFields != null ? new QueryGroup(queryFields, GetConjunction(expression)) : null);
}
/*
* Member
*/
/// <summary>
///
/// </summary>
/// <typeparam name="TEntity"></typeparam>
/// <param name="expression"></param>
/// <param name="unaryNodeType"></param>
/// <returns></returns>
private static QueryGroup Parse <TEntity>(MemberExpression expression,
ExpressionType?unaryNodeType = null)
where TEntity : class
{
var queryFields = QueryField.Parse <TEntity>(expression, unaryNodeType);
return(queryFields != null ? new QueryGroup(queryFields) : null);
}
private static QueryGroup Parse <TEntity>(BinaryExpression expression) where TEntity : class
{
var leftQueryGroup = (QueryGroup)null;
var rightQueryGroup = (QueryGroup)null;
var skipRight = false;
var isEqualsTo = true;
/*
* LEFT
*/
// Get the value in the right
if ((Nullable.GetUnderlyingType(expression.Right.Type) ?? expression.Right.Type) == typeof(bool) && (expression.Right.IsConstant() || expression.Right.IsMember()))
{
var value = expression.Right.GetValue();
isEqualsTo = value is bool && Equals(value, false) != true;
skipRight = true;
}
// Binary
if (expression.Left.IsBinary() == true)
{
leftQueryGroup = Parse <TEntity>(expression.Left.ToBinary());
leftQueryGroup.SetIsNot(isEqualsTo == false);
}
// Unary
else if (expression.Left.IsUnary() == true)
{
leftQueryGroup = Parse <TEntity>(expression.Left.ToUnary(), expression.NodeType, isEqualsTo: isEqualsTo);
}
// MethodCall
else if (expression.Left.IsMethodCall())
{
leftQueryGroup = Parse <TEntity>(expression.Left.ToMethodCall(), isEqualsTo: isEqualsTo);
}
else
{
// Extractable
if (expression.IsExtractable())
{
leftQueryGroup = new QueryGroup(QueryField.Parse <TEntity>(expression).AsEnumerable());
skipRight = true;
}
}
/*
* RIGHT
*/
if (skipRight == false)
{
// Binary
if (expression.Right.IsBinary() == true)
{
rightQueryGroup = Parse <TEntity>(expression.Right.ToBinary());
}
// Unary
if (expression.Right.IsUnary() == true)
{
rightQueryGroup = Parse <TEntity>(expression.Right.ToUnary(), expression.NodeType);
}
// MethodCall
else if (expression.Right.IsMethodCall())
{
rightQueryGroup = Parse <TEntity>(expression.Right.ToMethodCall());
}
// Return both of them
if (leftQueryGroup != null && rightQueryGroup != null)
{
var conjunction = (expression.NodeType == ExpressionType.OrElse) ? Conjunction.Or : Conjunction.And;
return(new QueryGroup(null, new[] { leftQueryGroup, rightQueryGroup }, conjunction));
}
}
// Return either one of them
return(leftQueryGroup ?? rightQueryGroup);
}
// Static Methods
/// <summary>
/// This method is used to parse the customized query tree expression. This method expects a dynamic object and converts it to the actual
/// <see cref="QueryGroup"/> that defines the query tree expression.
/// </summary>
/// <param name="obj">
/// A dynamic query tree expression to be parsed.
/// Example:
/// var expression = new { Conjunction = Conjunction.And, Company = "Microsoft",
/// FirstName = new { Operation = Operation.Like, Value = "An%" },
/// UpdatedDate = new { Operation = Operation.LessThan, Value = DateTime.UtcNow.Date }}
/// </param>
/// <returns>An instance of the <see cref="QueryGroup"/> object that contains the parsed query expression.</returns>
public static QueryGroup Parse(object obj)
{
// Cannot further optimize and shortify this method, this one works like a charm for now.
// Check for value
if (obj == null)
{
throw new ArgumentNullException($"Parameter '{StringConstant.Obj.ToLower()}' cannot be null.");
}
// Variables
var queryFields = new List <QueryField>();
var queryGroups = new List <QueryGroup>();
var conjunction = Conjunction.And;
// Iterate every property
var objectProperties = obj.GetType().GetProperties();
objectProperties.ToList().ForEach(property =>
{
var fieldName = property.Name;
// Identify the fields
if (string.Equals(fieldName, StringConstant.Conjunction, StringComparison.CurrentCultureIgnoreCase))
{
// Throws an exception if conjunction is not a conjunction type
if (property.PropertyType != typeof(Conjunction))
{
throw new InvalidQueryExpressionException($"Conjunction field must be of type {typeof(Conjunction).FullName}.");
}
// Conjunction
conjunction = (Conjunction)property.GetValue(obj);
}
else if (string.Equals(fieldName, StringConstant.QueryGroups, StringComparison.CurrentCultureIgnoreCase))
{
// Child QueryGroups
var value = property.GetValue(obj);
if (value is Array)
{
((Array)value).AsEnumerable().ToList().ForEach(item =>
{
queryGroups.Add(Parse(item));
});
}
else
{
queryGroups.Add(Parse(value));
}
}
else
{
// Other pre-defined fields
var value = property.GetValue(obj);
var type = value?.GetType();
if (type?.IsGenericType == false || value == null)
{
// Most likely, (Field.Name = <value|null>)
queryFields.Add(new QueryField(fieldName, value));
}
else
{
// Another dynamic object type, get the 'Operation' property
var properties = type?.GetProperties();
var operationProperty = properties?.FirstOrDefault(p => p.Name.ToLower() == StringConstant.Operation.ToLower());
// The property 'Operation' must always be present
if (operationProperty == null)
{
throw new InvalidQueryExpressionException($"The 'Operation' property must be present for field '{property.Name}'.");
}
// The property operatoin must be of type 'RepoDb.Enumerations.Operation'
if (operationProperty.PropertyType != typeof(Operation))
{
throw new InvalidQueryExpressionException($"The 'Operation' property for field '{property.Name}' must be of type '{typeof(Operation).FullName}'.");
}
// The 'Value' property must always be present
var valueProperty = properties?.FirstOrDefault(p => p.Name.ToLower() == StringConstant.Value.ToLower());
// Check for the 'Value' property
if (valueProperty == null)
{
throw new InvalidQueryExpressionException($"The 'Value' property for dynamic type query must be present at field '{property.Name}'.");
}
// Get the 'Operation' and the 'Value' value
var operation = (Operation)operationProperty.GetValue(value);
value = valueProperty.GetValue(value);
// For other operation, the 'Value' property must be present
if (value == null && (operation != Operation.Equal && operation != Operation.NotEqual))
{
throw new InvalidQueryExpressionException($"The value property '{valueProperty.Name}' must not be null.");
}
// Identify the 'Operation' and parse the correct value
if ((operation == Operation.Equal || operation == Operation.NotEqual) && value == null)
{
// Most likely, new { Field.Name = { Operation = Operation.<Equal|NotEqual>, Value = (object)null } }
// It should be (IS NULL) or (IS NOT NULL) in SQL Statement
queryFields.Add(new QueryField(fieldName, operation, value));
}
else if (operation == Operation.All || operation == Operation.Any)
{
// Special case: All (AND), Any (OR)
if (value.GetType().IsArray)
{
var childQueryGroupFields = new List <QueryField>();
((Array)value).AsEnumerable().ToList().ForEach(underlyingValue =>
{
childQueryGroupFields.Add(QueryField.Parse(fieldName, underlyingValue));
});
var queryGroup = new QueryGroup(childQueryGroupFields, null, operation == Operation.All ? Conjunction.And : Conjunction.Or);
queryGroups.Add(queryGroup);
}
else
{
queryFields.Add(QueryField.Parse(fieldName, value));
}
}
else
{
if (operation == Operation.Between || operation == Operation.NotBetween)
{
// Special case: (Field.Name = new { Operation = Operation.<Between|NotBetween>, Value = new [] { value1, value2 })
ValidateBetweenOperations(fieldName, operation, value);
}
else if (operation == Operation.In || operation == Operation.NotIn)
{
// Special case: (Field.Name = new { Operation = Operation.<In|NotIn>, Value = new [] { value1, value2 })
ValidateInOperations(fieldName, operation, value);
}
else
{
// Other Operations
ValidateOtherOperations(fieldName, operation, value);
}
// Add the field values
queryFields.Add(new QueryField(fieldName, operation, value));
}
}
}
});
// Return
return(new QueryGroup(queryFields, queryGroups, conjunction).FixParameters());
}
private static QueryGroup Parse <TEntity>(BinaryExpression expression) where TEntity : class
{
var leftQueryGroup = (QueryGroup)null;
var rightQueryGroup = (QueryGroup)null;
var rightValue = (object)null;
var skipRight = false;
var isEqualsTo = true;
/*
* LEFT
*/
// Get the value in the right
if (expression.IsExtractable())
{
rightValue = expression.Right.GetValue();
skipRight = true;
if (rightValue is bool)
{
isEqualsTo = Equals(rightValue, false) == false;
}
}
// Binary
if (expression.Left.IsBinary() == true)
{
leftQueryGroup = Parse <TEntity>(expression.Left.ToBinary());
leftQueryGroup.SetIsNot(isEqualsTo == false);
}
// Unary
else if (expression.Left.IsUnary() == true)
{
leftQueryGroup = Parse <TEntity>(expression.Left.ToUnary(), rightValue, expression.NodeType, isEqualsTo);
}
// MethodCall
else if (expression.Left.IsMethodCall())
{
leftQueryGroup = Parse <TEntity>(expression.Left.ToMethodCall(), false, isEqualsTo);
}
else
{
// Extractable
if (expression.IsExtractable())
{
leftQueryGroup = new QueryGroup(QueryField.Parse <TEntity>(expression));
skipRight = true;
}
}
// Identify the node type
if (expression.NodeType == ExpressionType.NotEqual)
{
leftQueryGroup.SetIsNot(leftQueryGroup.IsNot == isEqualsTo);
}
/*
* RIGHT
*/
if (skipRight == false)
{
// Binary
if (expression.Right.IsBinary() == true)
{
rightQueryGroup = Parse <TEntity>(expression.Right.ToBinary());
}
// Unary
else if (expression.Right.IsUnary() == true)
{
rightQueryGroup = Parse <TEntity>(expression.Right.ToUnary(), null, expression.NodeType, true);
}
// MethodCall
else if (expression.Right.IsMethodCall())
{
rightQueryGroup = Parse <TEntity>(expression.Right.ToMethodCall(), false, true);
}
// Return both of them
if (leftQueryGroup != null && rightQueryGroup != null)
{
var conjunction = (expression.NodeType == ExpressionType.OrElse) ? Conjunction.Or : Conjunction.And;
return(new QueryGroup(null, new[] { leftQueryGroup, rightQueryGroup }, conjunction));
}
}
// Return either one of them
return(leftQueryGroup ?? rightQueryGroup);
}
/// <summary>
/// Queries a data from the database table function.
/// </summary>
/// <typeparam name="TEntity">The type of the data entity object.</typeparam>
/// <param name="connection">The connection object to be used.</param>
/// <param name="funcName">Function name.</param>
/// <param name="parameters">The dynamic expression of function parameters.</param>
/// <param name="orderBy">The order definition of the fields to be used.</param>
/// <param name="hints">The table hints to be used.</param>
/// <param name="cacheKey">
/// The key to the cache. If the cache key is present in the cache, then the item from the cache will be returned instead. Setting this
/// to null would force to query from the database.
/// </param>
/// <param name="cacheItemExpiration">The expiration in minutes of the cache item.</param>
/// <param name="commandTimeout">The command timeout in seconds to be used.</param>
/// <param name="transaction">The transaction to be used.</param>
/// <param name="cache">The cache object to be used.</param>
/// <param name="trace">The trace object to be used.</param>
/// <param name="statementBuilder">The statement builder object to be used.</param>
/// <returns>An enumerable list of data entity object.</returns>
public static IEnumerable <TEntity> QueryAllTableFunc <TEntity>(this IDbConnection connection,
string funcName,
object parameters,
IEnumerable <OrderField> orderBy = null,
string hints = null,
string cacheKey = null,
int cacheItemExpiration = Constant.DefaultCacheItemExpirationInMinutes,
int?commandTimeout = null,
IDbTransaction transaction = null,
ICache cache = null,
ITrace trace = null,
IStatementBuilder statementBuilder = null)
where TEntity : class
{
return(QueryAllTableFunc <TEntity>(connection: connection,
funcName: funcName,
parameters: parameters == null ? null : QueryField.Parse(parameters),
orderBy: orderBy,
hints: hints,
cacheKey: cacheKey,
cacheItemExpiration: cacheItemExpiration,
commandTimeout: commandTimeout,
transaction: transaction,
cache: cache,
trace: trace,
statementBuilder: statementBuilder));
}