public TypeDefinition(Type type)
{
if (DefinitionCache.ContainsKey(type))
{
Definition = DefinitionCache[type];
return;
}
Definition = new DefinitionCacheItem();
ParseType(type);
DefinitionCache[type] = Definition;
}
/// <summary>
/// Loads the necessary command definitions to create a backing table and
/// perform CRUD operations with models.
/// </summary>
private void LoadDefinitions()
{
var dbSetType = GetType();
if (DefinitionCache.ContainsKey(dbSetType))
{
var cache = DefinitionCache[dbSetType];
TableName = cache.TableName;
TableDefinition = cache.TableDefinition;
SelectDefinition = cache.SelectDefinition;
InsertDefinition = cache.InsertDefinition;
UpdateDefinition = cache.UpdateDefinition;
DeleteDefinition = cache.DeleteDefinition;
return;
}
var createBuilder = new StringBuilder();
var indexBuilder = new List <string>();
var publicInstanceFlags = BindingFlags.Instance | BindingFlags.Public;
var properties = typeof(T).GetProperties(publicInstanceFlags);
var propertyNames = new List <string>();
// Start off with the table name
var tableName = nameof(T);
var tableAttribute = typeof(T).GetTypeInfo().GetCustomAttribute <TableAttribute>();
if (tableAttribute != null)
{
tableName = tableAttribute.Name;
}
createBuilder.AppendLine($"CREATE TABLE IF NOT EXISTS [{tableName}] (");
createBuilder.AppendLine($" [{nameof(ILiteModel.RowId)}] INTEGER PRIMARY KEY AUTOINCREMENT,");
foreach (var property in properties)
{
if (property.Name == nameof(ILiteModel.RowId))
{
continue;
}
if (property.CanWrite == false)
{
continue;
}
{
// Skip if not mapped
var notMappedAttribute = property.GetCustomAttribute <NotMappedAttribute>();
if (notMappedAttribute != null)
{
continue;
}
}
{
// Add to indexes if indexed attribute is ON
var indexedAttribute = property.GetCustomAttribute <LiteIndexAttribute>();
if (indexedAttribute != null)
{
indexBuilder.Add(
$"CREATE INDEX IF NOT EXISTS [IX_{tableName}_{property.Name}] ON [{tableName}] ([{property.Name}]);");
}
}
{
// Add to unique indexes if indexed attribute is ON
var uniqueIndexAttribute = property.GetCustomAttribute <LiteUniqueAttribute>();
if (uniqueIndexAttribute != null)
{
indexBuilder.Add(
$"CREATE UNIQUE INDEX IF NOT EXISTS [IX_{tableName}_{property.Name}] ON [{tableName}] ([{property.Name}]);");
}
}
propertyNames.Add(property.Name);
var propertyType = property.PropertyType;
var isNullable = propertyType.GetTypeInfo().IsGenericType&&
propertyType.GetGenericTypeDefinition() == typeof(Nullable <>);
if (isNullable)
{
propertyType = Nullable.GetUnderlyingType(propertyType);
}
var nullStatement = isNullable ? "NULL" : "NOT NULL";
if (propertyType == typeof(string))
{
var stringLength = 4096;
{
var stringLengthAttribute = property.GetCustomAttribute <StringLengthAttribute>();
if (stringLengthAttribute != null)
{
stringLength = stringLengthAttribute.MaximumLength;
}
}
isNullable = property.GetCustomAttribute <RequiredAttribute>() == null;
nullStatement = isNullable ? "NULL" : "NOT NULL";
if (stringLength != 4096)
{
var checkLength = $"length({property.Name})<={stringLength}";
createBuilder.AppendLine(
$" [{property.Name}] NVARCHAR({stringLength}) {nullStatement} CHECK({checkLength}),");
}
else
{
createBuilder.AppendLine($" [{property.Name}] NVARCHAR({stringLength}) {nullStatement},");
}
}
else if (propertyType.GetTypeInfo().IsValueType)
{
if (TypeMappings.ContainsKey(propertyType))
{
createBuilder.AppendLine($" [{property.Name}] {TypeMappings[propertyType]} {nullStatement},");
}
else
{
createBuilder.AppendLine($" [{property.Name}] TEXT {nullStatement},");
}
}
else if (propertyType == typeof(byte[]))
{
createBuilder.AppendLine($" [{property.Name}] BLOB {nullStatement},");
}
}
//trim out the extra comma
createBuilder.Remove(createBuilder.Length - System.Environment.NewLine.Length - 1, System.Environment.NewLine.Length + 1);
createBuilder.AppendLine();
createBuilder.AppendLine($");");
foreach (var indexDdl in indexBuilder)
{
createBuilder.AppendLine(indexDdl);
}
var escapedColumnNames = string.Join(", ", propertyNames.Select(p => $"[{p}]").ToArray());
var parameterColumnNames = string.Join(", ", propertyNames.Select(p => $"@{p}").ToArray());
var keyValueColumnNames = string.Join(", ", propertyNames.Select(p => $"[{p}] = @{p}").ToArray());
TableName = tableName;
TableDefinition = createBuilder.ToString();
SelectDefinition = $"SELECT [{nameof(ILiteModel.RowId)}], {escapedColumnNames} FROM [{tableName}]";
InsertDefinition =
$"INSERT INTO [{tableName}] ({escapedColumnNames}) VALUES ({parameterColumnNames}); SELECT last_insert_rowid();";
UpdateDefinition =
$"UPDATE [{tableName}] SET {keyValueColumnNames} WHERE [{nameof(ILiteModel.RowId)}] = @{nameof(ILiteModel.RowId)}";
DeleteDefinition =
$"DELETE FROM [{tableName}] WHERE [{nameof(ILiteModel.RowId)}] = @{nameof(ILiteModel.RowId)}";
DefinitionCache[dbSetType] = new DefinitionCacheItem
{
TableName = TableName,
TableDefinition = TableDefinition,
SelectDefinition = SelectDefinition,
InsertDefinition = InsertDefinition,
UpdateDefinition = UpdateDefinition,
DeleteDefinition = DeleteDefinition
};
}
/// <summary>
/// Initializes a new instance of the <see cref="LiteDbSet{T}"/> class.
/// </summary>
public LiteDbSet()
{
_tableDefinition = new TypeDefinition(typeof(T)).Definition;
}
