private string GetWhereClause(QueryBuilderConfig config)
{
var entityName = config.QueryBuilderSettings.FirstOrDefault(x => x.Name == "EntityName").Value;
var root = config.Query.GetRoot();
if (root.PredicateNode)
{
return(GetPredicateQuery(root.Predicate, entityName));
}
if (root.Left.PredicateNode && root.Right.PredicateNode)
{
return(GetLogicPredicateQuery(root, entityName));
}
var left = TraverseTreeBuildingQuery(root.Left, entityName);
var right = TraverseTreeBuildingQuery(root.Right, entityName);
if (right.Count() == 1 && left.Count() == 1)
{
return($"{left.Pop()} {GetLogicOperator(root.Operator.Value)} {right.Pop()}");
}
throw new ApplicationException("Error in generating query");
}
public string GetQuery(QueryBuilderConfig config)
{
//first get the root of the tree
var root = config.Query.GetRoot();
//simple case is, its only one query without a logical operator
if (root.PredicateNode)
{
var q = GetPredicateQuery(root.Predicate);
return(q);
}
//second simple case both left and right nodes are predicates
if (root.Left.PredicateNode && root.Right.PredicateNode)
{
return(GetLogicPredicateQuery(root));
}
//now we begin the fun part
var left = TraverseTreeBuildingQuery(root.Left);
var right = TraverseTreeBuildingQuery(root.Right);
var logicQueryStart = GetQueryForLogic(root.Operator.Value);
if (right.Count() == 1 && left.Count() == 1)
{
return($"{logicQueryStart}{left.Pop()},{right.Pop()}]}}}}");
}
throw new ApplicationException("Error in generating query");
}
public string GetQuery(QueryBuilderConfig config)
{
var tableName = config.QueryBuilderSettings.FirstOrDefault(x => x.Name == "TableName");
var whereClause = GetWhereClause(config);
var sqlQuery = $"SELECT * FROM {tableName.Value} WHERE {whereClause};";
return(sqlQuery);
}
