/// <summary>
/// Query datas
/// </summary>
/// <typeparam name="T">Data type</typeparam>
/// <param name="server">Database server</param>
/// <param name="command">Command</param>
/// <returns>Return datas</returns>
public async Task <IEnumerable <T> > QueryAsync <T>(DatabaseServer server, ICommand command)
{
if (command.Query == null)
{
throw new EZNEWException($"{nameof(ICommand.Query)} is null");
}
#region query translation
IQueryTranslator translator = SQLiteManager.GetQueryTranslator(DataAccessContext.Create(server, command));
var tranResult = translator.Translate(command.Query);
string joinScript = tranResult.AllowJoin ? tranResult.JoinScript : string.Empty;
#endregion
#region script
string cmdText;
switch (command.Query.ExecutionMode)
{
case QueryExecutionMode.Text:
cmdText = tranResult.ConditionString;
break;
case QueryExecutionMode.QueryObject:
default:
int size = command.Query.QuerySize;
string objectName = translator.DataAccessContext.GetCommandEntityObjectName(command);
string orderString = string.IsNullOrWhiteSpace(tranResult.SortString) ? string.Empty : $"ORDER BY {tranResult.SortString}";
var queryFields = SQLiteManager.GetQueryFields(command.Query, command.EntityType, true);
string outputFormatedField = string.Join(",", SQLiteManager.FormatQueryFields(translator.ObjectPetName, queryFields, true));
if (string.IsNullOrWhiteSpace(tranResult.CombineScript))
{
cmdText = $"{tranResult.PreScript}SELECT {outputFormatedField} FROM {SQLiteManager.WrapKeyword(objectName)} AS {translator.ObjectPetName} {joinScript} {(string.IsNullOrWhiteSpace(tranResult.ConditionString) ? string.Empty : $"WHERE {tranResult.ConditionString}")} {orderString} {(size > 0 ? $"LIMIT 0,{size}" : string.Empty)}";
}
/// <summary>
/// Execute translation
/// </summary>
/// <param name="query">Query object</param>
/// <param name="location">Query location</param>
/// <param name="parameters">Parameters</param>
/// <param name="objectName">Entity object name</param>
/// <param name="useSort">Indicates whether use sort</param>
/// <returns>Return a translation result</returns>
public QueryTranslationResult ExecuteTranslation(IQuery query, QueryLocation location, CommandParameters parameters = null, string objectName = "", bool useSort = true)
{
if (query == null)
{
return(QueryTranslationResult.Empty);
}
StringBuilder conditionBuilder = new StringBuilder();
if (query.ExecutionMode == QueryExecutionMode.QueryObject)
{
StringBuilder orderBuilder = new StringBuilder();
parameters = parameters ?? new CommandParameters();
objectName = string.IsNullOrWhiteSpace(objectName) ? DefaultObjectPetName : objectName;
List <string> withScripts = new List <string>();
string recurveTableName = string.Empty;
string recurveTablePetName = string.Empty;
#region condition
if (!query.Conditions.IsNullOrEmpty())
{
int index = 0;
foreach (var condition in query.Conditions)
{
var conditionResult = TranslateCondition(query, condition, parameters, objectName);
if (!conditionResult.WithScripts.IsNullOrEmpty())
{
withScripts.AddRange(conditionResult.WithScripts);
recurveTableName = conditionResult.RecurveObjectName;
recurveTablePetName = conditionResult.RecurvePetName;
}
conditionBuilder.Append($" {(index > 0 ? condition.Connector.ToString().ToUpper() : string.Empty)} {conditionResult.ConditionString}");
index++;
}
}
#endregion
#region sort
if (useSort && !query.Sorts.IsNullOrEmpty())
{
foreach (var sortEntry in query.Sorts)
{
orderBuilder.Append($"{ConvertSortFieldName(query, objectName, sortEntry)} {(sortEntry.Desc ? DescKeyWord : AscKeyWord)},");
}
}
#endregion
#region combine
StringBuilder combineBuilder = new StringBuilder();
if (!query.Combines.IsNullOrEmpty())
{
foreach (var combineEntry in query.Combines)
{
if (combineEntry?.Query == null)
{
continue;
}
var combineObjectPetName = GetNewSubObjectPetName();
string combineObjectName = DataAccessContext.GetCombineEntityObjectName(combineEntry.Query);
var combineQueryResult = ExecuteTranslation(combineEntry.Query, QueryLocation.Combine, parameters, combineObjectPetName, true);
string combineConditionString = string.IsNullOrWhiteSpace(combineQueryResult.ConditionString) ? string.Empty : $"WHERE {combineQueryResult.ConditionString}";
combineBuilder.Append($" {GetCombineOperator(combineEntry.Type)} SELECT {string.Join(",", SQLiteManager.FormatQueryFields(combineObjectPetName, query, query.GetEntityType(), true, false))} FROM {SQLiteManager.WrapKeyword(combineObjectName)} AS {combineObjectPetName} {(combineQueryResult.AllowJoin ? combineQueryResult.JoinScript : string.Empty)} {combineConditionString}");
if (!combineQueryResult.WithScripts.IsNullOrEmpty())
{
withScripts.AddRange(combineQueryResult.WithScripts);
recurveTableName = combineQueryResult.RecurveObjectName;
recurveTablePetName = combineQueryResult.RecurvePetName;
}
}
}
#endregion
#region join
bool allowJoin = true;
StringBuilder joinBuilder = new StringBuilder();
StringBuilder joinExtraCondition = new StringBuilder();
if (!query.Joins.IsNullOrEmpty())
{
foreach (var joinEntry in query.Joins)
{
if (joinEntry == null || joinEntry.JoinObjectFilter == null)
{
continue;
}
if (joinEntry.JoinObjectFilter.GetEntityType() == null)
{
throw new EZNEWException("IQuery object must set entity type if use in join operation");
}
string joinObjectPetName = GetNewSubObjectPetName();
var joinQueryResult = ExecuteTranslation(joinEntry.JoinObjectFilter, QueryLocation.Join, parameters, joinObjectPetName, true);
if (string.IsNullOrWhiteSpace(joinQueryResult.CombineScript))
{
var joinResult = GetJoinCondition(query, joinEntry, parameters, objectName, joinObjectPetName);
if (!joinResult.WithScripts.IsNullOrEmpty())
{
withScripts.AddRange(joinResult.WithScripts);
recurveTableName = joinResult.RecurveObjectName;
recurveTablePetName = joinResult.RecurvePetName;
}
var joinConnection = joinResult.ConditionString;
if (!string.IsNullOrWhiteSpace(joinQueryResult.ConditionString))
{
if (joinQueryResult.AllowJoin && PositionJoinConditionToConnection(joinEntry.Type))
{
joinConnection += $"{(string.IsNullOrWhiteSpace(joinConnection) ? " ON" : " AND ")}{joinQueryResult.ConditionString}";
}
else
{
conditionBuilder.Append($"{(conditionBuilder.Length == 0 ? string.Empty : " AND ")}{joinQueryResult.ConditionString}");
}
}
if (!string.IsNullOrWhiteSpace(joinQueryResult.JoinExtraConditionString))
{
conditionBuilder.Append($"{(conditionBuilder.Length == 0 ? string.Empty : " AND ")}{joinQueryResult.JoinExtraConditionString}");
}
joinBuilder.Append($" {GetJoinOperator(joinEntry.Type)} {SQLiteManager.WrapKeyword(DataAccessContext.GetJoinEntityObjectName(joinEntry.JoinObjectFilter))} AS {joinObjectPetName}{joinConnection}");
if (joinEntry.JoinObjectExtraFilter != null)
{
var extraQueryResult = ExecuteTranslation(joinEntry.JoinObjectExtraFilter, QueryLocation.Join, parameters, joinObjectPetName, true);
if (!string.IsNullOrWhiteSpace(extraQueryResult.ConditionString))
{
joinExtraCondition.Append(joinExtraCondition.Length > 0 ? $" AND {extraQueryResult.ConditionString}" : extraQueryResult.ConditionString);
}
}
if (joinQueryResult.AllowJoin && !string.IsNullOrWhiteSpace(joinQueryResult.JoinScript))
{
joinBuilder.Append($" {joinQueryResult.JoinScript}");
}
}
else
{
var combineJoinObjName = GetNewSubObjectPetName();
var joinResult = GetJoinCondition(query, joinEntry, parameters, objectName, combineJoinObjName);
if (!joinResult.WithScripts.IsNullOrEmpty())
{
withScripts.AddRange(joinResult.WithScripts);
recurveTableName = joinResult.RecurveObjectName;
recurveTablePetName = joinResult.RecurvePetName;
}
var joinConnection = joinResult.ConditionString;
joinBuilder.Append($" {GetJoinOperator(joinEntry.Type)} (SELECT {string.Join(",", SQLiteManager.FormatQueryFields(joinObjectPetName, joinEntry.JoinObjectFilter, joinEntry.JoinObjectFilter.GetEntityType(), false, false))} FROM {SQLiteManager.WrapKeyword(DataAccessContext.GetJoinEntityObjectName(joinEntry.JoinObjectFilter))} AS {joinObjectPetName} {(joinQueryResult.AllowJoin ? joinQueryResult.JoinScript : string.Empty)} {(string.IsNullOrWhiteSpace(joinQueryResult.ConditionString) ? string.Empty : "WHERE " + joinQueryResult.ConditionString)} {joinQueryResult.CombineScript}) AS {combineJoinObjName}{joinConnection}");
}
if (!joinQueryResult.WithScripts.IsNullOrEmpty())
{
withScripts.AddRange(joinQueryResult.WithScripts);
recurveTableName = joinQueryResult.RecurveObjectName;
recurveTablePetName = joinQueryResult.RecurvePetName;
}
}
}
string joinScript = joinBuilder.ToString();
#endregion
#region recurve script
string conditionString = conditionBuilder.ToString();
string joinExtraConditionString = joinExtraCondition.ToString();
if (query.Recurve != null)
{
allowJoin = false;
string nowConditionString = conditionString;
if (!string.IsNullOrWhiteSpace(joinExtraConditionString))
{
nowConditionString = string.IsNullOrWhiteSpace(nowConditionString) ? joinExtraConditionString : $"{nowConditionString} AND {joinExtraConditionString}";
joinExtraConditionString = string.Empty;
}
EntityField recurveField = DataManager.GetField(DatabaseServerType, query, query.Recurve.DataField);
EntityField recurveRelationField = DataManager.GetField(DatabaseServerType, query, query.Recurve.RelationField);
var recurveTable = GetNewRecurveTableName();
recurveTablePetName = recurveTable.Item1;
recurveTableName = recurveTable.Item2;
conditionString = $"{objectName}.{SQLiteManager.WrapKeyword(recurveField.FieldName)} IN (SELECT {recurveTablePetName}.{SQLiteManager.WrapKeyword(recurveField.FieldName)} FROM {SQLiteManager.WrapKeyword(recurveTableName)} AS {recurveTablePetName})";
DataAccessContext.SetActivityQuery(query, location);
string queryObjectName = DataManager.GetEntityObjectName(DataAccessContext);
string withScript =
$"{recurveTableName} AS (SELECT {objectName}.{SQLiteManager.WrapKeyword(recurveField.FieldName)},{objectName}.{SQLiteManager.WrapKeyword(recurveRelationField.FieldName)} FROM {SQLiteManager.WrapKeyword(queryObjectName)} AS {objectName} {joinScript} {(string.IsNullOrWhiteSpace(nowConditionString) ? string.Empty : $"WHERE {nowConditionString}")} " +
$"UNION ALL SELECT {objectName}.{SQLiteManager.WrapKeyword(recurveField.FieldName)},{objectName}.{SQLiteManager.WrapKeyword(recurveRelationField.FieldName)} FROM {SQLiteManager.WrapKeyword(queryObjectName)} AS {objectName} JOIN {recurveTableName} AS {recurveTablePetName} " +
$"ON {(query.Recurve.Direction == RecurveDirection.Up ? $"{objectName}.{SQLiteManager.WrapKeyword(recurveField.FieldName)}={recurveTablePetName}.{SQLiteManager.WrapKeyword(recurveRelationField.FieldName)}" : $"{objectName}.{SQLiteManager.WrapKeyword(recurveRelationField.FieldName)}={recurveTablePetName}.{SQLiteManager.WrapKeyword(recurveField.FieldName)}")})";