public void Update(object entity)
{
var entityType = typeof(TEntity);
var tableAlias = TableEntityAliasCache.GetOrAddAlias(entityType);
var tableName = GetTableName(entityType);
var props = entityType.GetProperties();
StringBuilder arguments = new StringBuilder();
foreach (var prop in props)
{
PrepareUpdateArguments(entity, prop, arguments);
}
arguments.Remove(arguments.Length - 1, 1);
var updateSql = Statements.CreateUpdateStatement(tableAlias, tableName, arguments.ToString(), ConditionSql);
try
{
ExecuteNonQueryCommand(updateSql);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
public void Delete()
{
var entityType = typeof(TEntity);
var tableAlias = TableEntityAliasCache.GetOrAddAlias(entityType);
var tableName = GetTableName(entityType);
try
{
ExecuteNonQueryCommand(Statements.CreateDeleteStatement(tableAlias, ConditionSql, tableName));
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
private void PrepareUpdateArguments(object entity, PropertyInfo prop, StringBuilder values)
{
var tableAlias = TableEntityAliasCache.GetOrAddAlias(typeof(TEntity));
var column = GetColumnName(prop);
if (column == null)
{
return;
}
if (prop.GetValue(entity) == null)
{
values.Append($"{GetColumnName(prop)} = NULL,");
}
else if (prop.PropertyType.IsClass && prop.PropertyType != typeof(string))
{
var innerProperties = prop.PropertyType.GetProperties();
var instance = prop.GetValue(entity);
var innerValue = GetInnerId(innerProperties, instance);
if (prop.PropertyType == typeof(string) || prop.PropertyType == typeof(TimeSpan))
{
values.Append($"{tableAlias}.{column} = '{innerValue}',");
}
else
{
values.Append($"{tableAlias}.{column} = {innerValue},");
}
}
else
{
if (prop.PropertyType == typeof(string) || prop.PropertyType == typeof(TimeSpan))
{
values.Append($"{tableAlias}.{column} = '{prop.GetValue(entity)}',");
}
else if (prop.PropertyType.IsEnum)
{
values.Append($"{tableAlias}.{column} = {(int)prop.GetValue(entity)},");
}
else
{
values.Append($"{tableAlias}.{column} = {prop.GetValue(entity)},");
}
}
}
private string LoadLeftJoins()
{
var stringBuilder = new StringBuilder();
EntityJoinRequests.ForEach(request =>
{
var entityTypeFrom = request.EntityTypeFrom;
var entityTypeTo = request.EntityTypeTo;
var entityAliasFrom = TableEntityAliasCache.GetOrAddAlias(entityTypeFrom);
var entityAliasTo = TableEntityAliasCache.GetOrAddAlias(entityTypeTo);
var entityTableName = GetTableName(entityTypeFrom);
var rightJoinAttribute = entityAliasFrom + "." + request.PrimaryKeyColumn;
var leftJoinAttribute = entityAliasTo + "." + request.ForeignKeyColumn;
stringBuilder.Append($"LEFT OUTER JOIN {entityTableName} ON ({leftJoinAttribute} = {rightJoinAttribute}) ");
});
return(stringBuilder.ToString());
}
private IEnumerable <TEntity> GetEntities(string sqlStatement, IReadOnlyList <string> columnNames, Type entityType,
PropertyInfo[] entityProperties)
{
var currentEntityAlias = TableEntityAliasCache.GetOrAddAlias(entityType);
var propertiesColumnHashMap = new Dictionary <string, object>();
var entities = new List <TEntity>();
using var sqlCommand = new SqlCommand(sqlStatement, _sqlConnection);
using var sqlReader = sqlCommand.ExecuteReader();
while (sqlReader.Read())
{
for (var index = 0; index < columnNames.Count; index++)
{
propertiesColumnHashMap.Add(columnNames[index], sqlReader.GetValue(index));
}
var entity = Activator.CreateInstance(entityType);
foreach (var entityProperty in entityProperties)
{
var currentColumnName = currentEntityAlias + "." + GetColumnName(entityProperty, true);
if (MapInnerEntity(entityProperty, entity, propertiesColumnHashMap))
{
continue;
}
entityProperty.SetValue(entity,
propertiesColumnHashMap[currentColumnName] == DBNull.Value
? null
: propertiesColumnHashMap[currentColumnName]);
}
entities.Add((TEntity)entity);
propertiesColumnHashMap.Clear();
}
return(entities);
}
private bool MapInnerEntity(PropertyInfo entityProperty, object entity, Dictionary <string, object> propertiesColumnHashMap)
{
if (entityProperty.GetCustomAttribute(typeof(ForeignKeyAttribute)) == null)
{
return(false);
}
if (EntityJoinRequests.Count(request =>
request.EntityTypeFrom == entityProperty.PropertyType) == 0)
{
entityProperty.SetValue(entity, null);
return(true);
}
var innerEntity = Activator.CreateInstance(entityProperty.PropertyType);
foreach (var propertyInfo in entityProperty.PropertyType.GetProperties().ToList())
{
var innerEntityColumn = TableEntityAliasCache.GetOrAddAlias(entityProperty.PropertyType) +
"." +
GetColumnName(propertyInfo, true);
if (propertyInfo.GetCustomAttribute(typeof(ForeignKeyAttribute)) != null)
{
MapInnerEntity(propertyInfo, innerEntity, propertiesColumnHashMap);
}
if (propertiesColumnHashMap.ContainsKey(innerEntityColumn))
{
propertyInfo.SetValue(innerEntity,
propertiesColumnHashMap[innerEntityColumn] == DBNull.Value
? null
: propertiesColumnHashMap[innerEntityColumn]);
}
}
entityProperty.SetValue(entity, innerEntity);
return(true);
}
private void LoadColumnsFromJoinedEntities(ICollection <string> columnNames)
{
EntityJoinRequests.ForEach(request =>
{
var entityType = request.EntityTypeFrom;
var entityProperties = entityType.GetProperties();
var entityAlias = TableEntityAliasCache.GetOrAddAlias(entityType);
entityProperties.ToList().ForEach(currentProperty =>
{
if (currentProperty.GetCustomAttribute(typeof(ForeignKeyAttribute)) != null)
{
return;
}
var column = GetColumnName(currentProperty, true);
if (column != null)
{
columnNames.Add($"{entityAlias}.{column}");
}
});
});
}
private IEnumerable <TEntity> Select()
{
var entityType = typeof(TEntity);
var entityAlias = TableEntityAliasCache.GetOrAddAlias(entityType);
var tableName = GetTableName(entityType);
var entityProperties = entityType.GetProperties();
var columnNames = (from entityProperty in entityProperties
where entityProperty.GetCustomAttribute(typeof(ForeignKeyAttribute)) == null
select GetColumnName(entityProperty, true) into column
where column != null select $"{entityAlias}.{column}").ToList();
LoadColumnsFromJoinedEntities(columnNames);
var leftJoins = LoadLeftJoins();
var sqlStatement = EntityJoinRequests.Count == 0 ? Statements.CreateSelectStatement(columnNames, tableName, ConditionSql) : Statements.CreateSelectWithJoinsStatement(columnNames, tableName, leftJoins, ConditionSql);
return(GetEntities(sqlStatement, columnNames, entityType, entityProperties));
}
