internal virtual void Init(Type objectType, IDBAccess dbAccess)
{
TypeSchema entityInfo = ORMSchemaCache.GetTypeSchema(objectType);
SchemaItem fieldInfo = entityInfo.GetFieldInfoByPropertyName(this._propertyName);
if (fieldInfo == null)
{
throw new ArgumentException(string.Format("{0} - Property \"{1}\" not define a mapping field.", this.GetType(), _propertyName));
}
Type type = fieldInfo.ProInfo.PropertyType;
type = Nullable.GetUnderlyingType(type) ?? type;
this._dbType = ORMHelper.GetDbTypeByName(type);
this._fieldName = fieldInfo.MappingFieldAttribute.FieldName;
this._dbAccess = dbAccess;
}
protected DbParameter GetDbParameter(PropertyInfo fieldProperty, object entity)
{
DbParameter parameter = DbAccess.CreateDbParameter();
Type tempType = fieldProperty.PropertyType;
if (Nullable.GetUnderlyingType(tempType) != null)//如果是 int? 类型则进行处理
{
tempType = Nullable.GetUnderlyingType(tempType);
}
parameter.ParameterName = "@" + fieldProperty.Name;
parameter.DbType = ORMHelper.GetDbTypeByName(tempType);
object value = fieldProperty.GetValue(entity, null);
parameter.Value = value ?? DBNull.Value; //如果对象的属性为null，则把此参数设置为DBNull
return(parameter);
}
protected DbCommand GetDbCommandByKeyValue(TypeSchema entityInfo, object keyValue)
{
DbCommand dbCommand = DbAccess.CreateDbCommand();
foreach (SchemaItem mfi in entityInfo.GetKeyFieldInfos())
{
Type type = mfi.ProInfo.PropertyType;
type = Nullable.GetUnderlyingType(type) ?? type;
DbType dbType = ORMHelper.GetDbTypeByName(type);
DbParameter parameter = DbAccess.CreateDbParameter();
parameter.ParameterName = "@" + mfi.ProInfo.Name;
parameter.DbType = dbType;
//parameter.Value = Convert.ChangeType(keyValue, fieldProperty.PropertyType);
parameter.Value = Convert.ChangeType(keyValue, type);
dbCommand.Parameters.Add(parameter);
}
return(dbCommand);
}