django field types

Simple code is mainly used for learning. Note that escape is used for escape to prevent security problems caused by some special characters. Because author is a foreign key in my project, the related field has invalid lookup: icontains error occurs using the above method. Because the author field is not one-to-one, it is automatically associated with its own ID, that is, its own primary key, which is messy

the field types in the database correspond to the data types in C #:Database C # programsint int32Text stringbigint Int64Binary system.byte[]Bit BooleanChar stringDateTime System.DateTimeDecimal System.DecimalFloat System.DoubleImage system.byte[]Money System.DecimalNCHAR Stringntext StringNumeric System.Decimalnvarchar StringReal System.Singlesmalldatetime Syste

Rails Brochure3.8 UsechangeMethod1. Add a field to a tableRails g Migration Add_column_to_d_groups_equip_numclass Addcolumntodgroupsequipnum ] def change add_column:d _groups,: Equip_num,: Integer endend2. modifying table field typesRails g Migration Change_column_to_d_groups_equip_numclass Changecolumntodgroupsequipnum ] def Change change_ Column:d _groups,: Equip_num,: string endend3. Modify th

The field type in the database corresponds to the data type in C #: Database C # programint int32Text stringbigint Int64Binary system.byte[]Bit BooleanChar stringDateTime System.DateTimeDecimal System.DecimalFloat System.DoubleImage system.byte[]Money System.DecimalNCHAR Stringntext StringNumeric System.Decimalnvarchar StringReal System.Singlesmalldatetime System.DateTimesmallint Int16SmallMoney System.DecimalTimestamp System.DateTimetinyint System.By

Get table names and comments:Select Relname as Tabname,cast (obj_description (Relfilenode, ' pg_class ') as varchar) as comment from Pg_class Cwhere relkind = ' R ' and Relname not-like ' pg_% ' and relname not-like ' sql_% ' ORDER by RelnameFilter out the Sub-table:Conditional and relchecks=0 can beGets the field name, type, comment, whether it is empty:SELECT col_description (A.attrelid,a.attnum) as Comment,format_type (A.atttypid,a.atttypmod) as ty

A detailed description of the relevant field types in the database: Data type Type Description Bit Integral type The bit data type is integral, and its value can only be 0, 1, or null. This data type is used to store data with only two possible values, such as Yes or No, True or false, on, or off Int

() Method Take display_name.In the template, the template language {{User.sex}} can be used to display the value simply, but not directly by calling the Get_ property _display () method (template language after all)You can only customize the filter, by the way, you can't call functions directly in Django, you can do this by customizing the filter (template_filters.py)1 @register. Filter (name='displayName')2def DisplayName (Value, arg):3 return

Django is an open source model-View-Controller (MVC)-style WEB application framework that is driven by the Python programming language. With Django, we can create high-quality, maintainable, database-driven applications within minutes. Now let's take a look at how you can use the database in Django:Common data Types Autofield: int self-added, parameters must be p

%' _ Icontains indicates that Ilike '% AAA %' is case-insensitive. However, for SQLite, the effect of contains is equivalent to that of icontains. _ GT greater _ GTE greater than or equal _ Lt is less _ Equal to or less than LTE _ In exists in a list range. _ Startswith starts... _ Istartswith starts with... and ignores case sensitivity. _ Endswith ends... _ Iendswith ends with..., case insensitive _ Range is within the range... _ Year Year of the Date Fiel