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!239 update docs/zh/base/parts/base-mapper-update-methods.md.

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Merge pull request !239 from bygkn/N/A
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docs/zh/base/parts/base-mapper-update-methods.md
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- **`update(entity)`**：根据主键来更新数据，若实体类属性数据为 `null`，该属性不会新到数据库。
- **`update(entity)`**：根据主键来更新数据，若实体类属性数据为 `null`，该属性不会更新到数据库。
- **`update(entity, ignoreNulls)`**：根据主键来更新数据到数据库。
- **`updateByMap(entity, whereConditions)`**：根据 Map 构建的条件来更新数据。
- **`updateByMap(entity, ignoreNulls, whereConditions)`**：根据 Map 构建的条件来更新数据。