An explicit value for the identity column in table 'Zhuozi' can only be specified when a column list is used and IDENTITY INSERT is ON.怎么解决

这个错误通常发生在尝试插入一个指定了自增列值的记录时。要解决这个问题，你需要执行以下步骤：

1. 确保你已经正确地指定了自增列，并且没有尝试在插入记录时为其指定一个值。

2. 如果你确实需要为自增列指定值，可以启用 "IDENTITY_INSERT" 选项，使 SQL Server 允许你插入指定值。例如：

SET IDENTITY_INSERT Zhuozi ON;

-- 在此处插入指定自增列值的记录

SET IDENTITY_INSERT Zhuozi OFF;

3. 确保你使用了正确的列清单。如果你指定了自增列，你需要使用列清单来指定插入的列，例如：

INSERT INTO Zhuozi (col1, col2, identity_col)
VALUES (val1, val2, specified_identity_value);

请注意，你需要将 "IDENTITY_INSERT" 设置为 "ON"，并且明确指定要插入的列清单，包括自增列。

相关问题

Cannot insert explicit value for identity column in table 'eman_file' when IDENTITY_INSERT is set to OFF.

当你遇到这个错误消息 "Cannot insert explicit value for identity column in table 'eman_file' when IDENTITY_INSERT is set to OFF"，这意味着你在尝试在一个设置了 `IDENTITY_INSERT` 为 `OFF` 的表 (`eman_file`) 中插入数据时，试图指定标识列 (Identity Column) 的值。在 SQL Server 中，如果 `IDENTITY_INSERT` 设置为 `OFF`，那么当你向数据库插入新行时，标识列的值通常是自动递增的，不允许手动设置。

如果你想要插入一个特定的标识值，你应该先将 `IDENTITY_INSERT` 设置为 `ON`。然后进行插入操作，再将其恢复为 `OFF`。例如：

SET IDENTITY_INSERT eman_file ON;
INSERT INTO eman_file (column1, column2)
VALUES ('value1', 'value2');
SET IDENTITY_INSERT eman_file OFF;

Apps targeting Android 12 and higher are required to specify an explicit value for `android

:exported` attribute in the AndroidManifest.xml file for all components (activities, services, receivers, providers). This attribute indicates whether a component is accessible from other apps or not. It helps enhance the security of Android apps by explicitly defining the accessibility of each component.

Previously, if this attribute was not specified, the default behavior was that components were considered exported. However, starting from Android 12, specifying an explicit value for this attribute is mandatory for all components.

To specify the value for `android:exported`, you need to set it to either `true` or `false` depending on your app's requirements. If you want to allow other apps to access the component, set it to `true`. If you want to restrict access to only your app, set it to `false`.

Here is an example of how the `android:exported` attribute can be set for an activity in the AndroidManifest.xml file:

<activity android:name=".MainActivity"
    ...
    android:exported="true">
    ...
</activity>

Make sure to review and update the `android:exported` attribute for all components in your AndroidManifest.xml file when targeting Android 12 and higher to comply with the new requirement.