Oracle教程 2023-02-23

Oracle 视图 ALL_JAVA_FIELDS 官方解释，作用，如何使用详细说明

Oracle视图ALL_JAVA_FIELDS用于存储具有特定包、类和字段的信息。ALL_JAVA_FIELDS视图包含以下信息：

1. 包名：表示一个JAVA文件的名称。
2. 类名：表示JAVA文件中的JAVA类的名称。
3. 字段名：表示在JAVA类中定义的字段的名称。
4. 类型：表示字段的数据类型。
5. 长度：表示字段的数据长度。
6. 默认值：表示字段的默认值。
7. 是否为可空：表示该字段是否为可空。

我们可以使用ALL_JAVA_FIELDS视图来获取一个特定Java类中声明的字段的信息，从而方便程序开发者进行设计，分析和调试。

ALL_JAVA_FIELDS displays field information about the stored Java classes accessible to the current user.

Related Views

DBA_JAVA_FIELDS displays field information about all stored Java classes in the database.
USER_JAVA_FIELDS displays field information about the stored Java classes owned by the current user. This view does not display the OWNER column.

Column	Datatype	NULL	Description
`OWNER`	`VARCHAR2(128)`	`NOT NULL`	Owner of the Java class
`NAME`	`VARCHAR2(4000)`		Name of the Java class
`FIELD_INDEX`	`NUMBER`		Index of the field
`FIELD_NAME`	`VARCHAR2(4000)`		Name of the field identified by the `FIELD_INDEX` column
`ACCESSIBILITY`	`VARCHAR2(9)`		Accessibility of the field: `PUBLIC` `PRIVATE` `PROTECTED`
`IS_STATIC`	`VARCHAR2(3)`		Indicates whether the field is a static field (`YES`) or not (`NO`)
`IS_FINAL`	`VARCHAR2(3)`		Indicates whether the field is a final field (`YES`) or not (`NO`)
`IS_VOLATILE`	`VARCHAR2(3)`		Indicates whether the field is volatile (`YES`) or not (`NO`)
`IS_TRANSIENT`	`VARCHAR2(3)`		Indicates whether the field is transient (`YES`) or not (`NO`)
`IS_SYNTHETIC`	`VARCHAR2(3)`		Indicates whether the field is generated by the compiler (`YES`) or not (`NO`)
`IS_ENUM`	`VARCHAR2(3)`		Indicates whether the field is a member of an enum (`YES`) or not (`NO`)
`ARRAY_DEPTH`	`NUMBER`		Array depth of the type of the field
`BASE_TYPE`	`VARCHAR2(7)`		Base type of the type of the field: `int` `long` `float` `double` `boolean` `byte` `char` `short` `class`
`FIELD_CLASS`	`VARCHAR2(4000)`		Actual class name of the base object if the base type is `class`