This column may contain values using all five storage classes.īehaves the same as a column with NUMERIC affinity with an exception in a CAST expression.īehaves like a column with NUMERIC affinity except that it forces integer values into floating point representationĪ column with affinity NONE does not prefer one storage class over another and no attempt is made to coerce data from one storage class into another. This column stores all data using storage classes NULL, TEXT or BLOB. The type affinity of a column is the recommended type for data stored in that column. SQLite supports the concept of "type affinity" on columns. In SQLite, Boolean values are stored as integers i.e. The data type of a value is associated with the value itself, not. In SQLite, it’s quite flexible to store data with the dynamic type system. SQLite does not Provide a separate Boolean storage class. There are two definitions related to data types we need to know in SQLite 3: Storage Classes used for a value. The value is a blob of data, stored exactly as it was input. Text string, stored using the database encoding (UTF-8, UTF-16BE or UTF-16LE). Any column can still store any type of data but the preferred storage class for a column is called its. SQLite supports the concept of type affinity on columns. The INTEGER storage class, for example, includes 6 different integer datatypes of different lengths. Signed integer, stored in 1, 2, 3, 4, 6, or 8 bytes depending on the magnitude of the valueĪ floating point value, 8-byte IEEE floating point number. SQLite storage class is slightly more general than a datatype. Storage classes Every value which is stored in an SQLite database has one of the following storage classes. In SQLite, the data type of a value is associated with the value itself, not with its container. SQLite uses a different and more general dynamic type system.SQLite Data Types are quite different than the normal SQL data types.On the other hand, the TEXT, INT, or REAL could be used to store date and time values. Note : SQLite do not have any different storage class for storing dates and/or times. NONE – A column having NONE affinity do not choose one storage class above other and do not change data from one storage class to other.and behaves like a column with NUMERIC affinity. REAL – It forces integer values into floating representation.INTEGER – It has an exception in a CAST expression and behaves in similar way as a column with NUMERIC affinity.NUMERIC – This column capture values for all storage classes.TEXT – This column captures all data for NULL, TEXT or BLOB.Every table’s column in SQLite database is assigned one of the following type affinities – The considered storage class for any column is called its affinity. Type Affinity concept is supported by SQLite on columns. There are five types of affinity supported by SQLite3 database. BLOB – It is a group of data, stored exactly as it was entered. The preferred storage class for a column is called its affinity.TEXT – It is a string, stored using the database encoding (UTF). But read the section on 'column affinity' in the datatypes page for the importance of selecting the right types and aliases for the pre-defined types. width' VARCHAR() fields (I know, in practice it can be crossed over), as well as 'no limit' TEXT fields.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |