模块 org.redkale
程序包 org.redkale.persistence

注释类型 Column

  • @Target({METHOD,FIELD})
@Retention(RUNTIME)
public @interface Column
    Specifies the mapped column for a persistent property or field. If no Column annotation is specified, the default values apply. 
        Example 1:

    @Column(name="DESC", nullable=false, length=512)
    public String getDescription() { return description; }

    Example 2:

    @Column(name="DESC",
            columnDefinition="CLOB NOT NULL",
            table="EMP_DETAIL")
    @Lob
    public String getDescription() { return description; }

    Example 3:

    @Column(name="ORDER_COST", updatable=false, precision=12, scale=2)
    public BigDecimal getCost() { return cost; }
    从以下版本开始:
    Java Persistence 1.0

    • 可选元素概要

      可选元素 
      修饰符和类型 可选元素 说明
      String comment
      (Optional) The comment of the column.
      String example
      for OpenAPI Specification 3
      boolean insertable
      (Optional) Whether the column is included in SQL INSERT statements generated by the persistence provider.
      int length
      (Optional) The column length.
      String name
      (Optional) The name of the column.
      boolean nullable
      (Optional) Whether the database column is required.
      int precision
      (Optional) The precision for a decimal (exact numeric) column.
      int scale
      (Optional) The scale for a decimal (exact numeric) column.
      boolean unique
      (Optional) Whether the column is a unique key.
      boolean updatable
      (Optional) Whether the column is included in SQL UPDATE statements generated by the persistence provider.

    • 元素详细资料

      • name

        String name
        (Optional) The name of the column. Defaults to the property or field name.
        返回:
        String
        默认值:
        ""

      • comment

        String comment
        (Optional) The comment of the column.
        返回:
        String
        默认值:
        ""

      • unique

        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 when the unique key constraint corresponds to only a single column. This constraint applies in addition to any constraint entailed by primary key mapping and to constraints specified at the table level.
        返回:
        boolean
        默认值:
        false

      • nullable

        boolean nullable
        (Optional) Whether the database column is required.
        返回:
        boolean
        默认值:
        true

      • example

        String example
        for OpenAPI Specification 3
        返回:
        String
        默认值:
        ""

      • insertable

        boolean insertable
        (Optional) Whether the column is included in SQL INSERT statements generated by the persistence provider.
        返回:
        boolean
        默认值:
        true

      • updatable

        boolean updatable
        (Optional) Whether the column is included in SQL UPDATE statements generated by the persistence provider.
        返回:
        boolean
        默认值:
        true

      • length

        int length
        (Optional) The column length. (Applies only if a string-valued column is used.) if type==String and length == 65535 then sqltype is TEXT
        if type==String and length <= 16777215 then sqltype is MEDIUMTEXT
        if type==String and length > 16777215 then sqltype is LONGTEXT
        if type==byte[] and length <= 65535 then sqltype is BLOB
        if type==byte[] and length <= 16777215 then sqltype is MEDIUMBLOB
        if type==byte[] and length > 16777215 then sqltype is LONGBLOB
        返回:
        int
        默认值:
        255

      • precision

        int precision
        (Optional) The precision for a decimal (exact numeric) column. (Applies only if a decimal column is used.) Value must be set by developer if used when generating the DDL for the column.
        返回:
        int
        默认值:
        0

      • scale

        int scale
        (Optional) The scale for a decimal (exact numeric) column. (Applies only if a decimal column is used.)
        返回:
        int
        默认值:
        0