com.ajaxjs.sqlman.annotation

注释类型 Column

@Target(value={FIELD,METHOD})
 @Retention(value=RUNTIME)
public @interface Column

Specifies the mapping of a persistent property or field.

从以下版本开始:

1.0

可选元素概要

可选元素

限定符和类型	可选元素和说明
String	columnDefinition (Optional) The SQL fragment that is used when generating the DDL for the column.
boolean	insertable (Optional) Whether the column is included in the generated SELECT statement for find and query operations.
int	length (Optional) The column length.
String	name (Optional) The name of the column.
boolean	nullable (Optional) Whether the column may be null.
int	precision (Optional) For numeric or date columns, specifies the precision to which the value is stored.
int	scale (Optional) For floating-point or decimal columns, specifies the number of digits after the decimal point.
String	table (Optional) The table in which the column is created in a secondary table scenario.
boolean	unique (Optional) Whether the column is a unique key.
boolean	updatable (Optional) Whether the column is included in the generated UPDATE statement for the entity.

元素详细资料

name

public abstract String name

(Optional) The name of the column. Defaults to the property or field name of the perishable class.

默认值:

""

insertable

public abstract boolean insertable

(Optional) Whether the column is included in the generated SELECT statement for find and query operations.

默认值:

true

updatable

public abstract boolean updatable

(Optional) Whether the column is included in the generated UPDATE statement for the entity.

默认值:

true

unique

public abstract boolean unique

(Optional) Whether the column is a unique key. This is a shortcut for the UniqueConstraint annotation at the table level and is useful for single-column primary keys.

默认值:

false

nullable

public abstract boolean nullable

(Optional) Whether the column may be null. Defaults to true.

默认值:

true

length

public abstract int length

(Optional) The column length. It should be set for string columns (such as CHAR, VARCHAR) and tinyint columns that store boolean values.

默认值:

255

precision

public abstract int precision

(Optional) For numeric or date columns, specifies the precision to which the value is stored.

默认值:

0

scale

public abstract int scale

(Optional) For floating-point or decimal columns, specifies the number of digits after the decimal point.

默认值:

0

columnDefinition

public abstract String columnDefinition

(Optional) The SQL fragment that is used when generating the DDL for the column.

默认值:

""

table

public abstract String table

(Optional) The table in which the column is created in a secondary table scenario.

默认值:

""