迁移文件中所有额外的垃圾是啥？

Posted 2023-03-14

【中文标题】迁移文件中所有额外的垃圾是啥？

【英文标题】：What is with all the extra junk in the migration file?迁移文件中所有额外的垃圾是什么？

【发布时间】：2011-09-01 02:17:06

【问题描述】：

我今天开始测试 grails 数据库迁移插件。我与域进行了初始同步，然后基于运行 diff 命令创建了一个新的更改日志。这应该像重命名列和（重新）将索引分配给该列一样简单。所以我希望看到以下...

changeSet(author: "gdboling (generated)", id: "1306242441630-1") 
    addColumn(tableName: "manuscript_review_reviewer") 
        column(name: "reviewer_id", type: "bigint") 
            constraints(nullable: "false")
        
    

changeSet(author: "gdboling (generated)", id: "1306242441630-2") 
    addPrimaryKey(columnNames: "manuscript_review_id, reviewer_id", constraintName: "manuscript_rePK", tableName: "manuscript_review_reviewer")

changeSet(author: "gdboling (generated)", id: "1306242441630-3") 
    dropPrimaryKey(tableName: "manuscript_review_reviewer")

changeSet(author: "gdboling (generated)", id: "1306242441630-4") 
    dropForeignKeyConstraint(baseTableName: "manuscript_review_reviewer", baseTableSchemaName: "manning_main_dev", constraintName: "FK9BEFBBB34863C659")

changeSet(author: "gdboling (generated)", id: "1306242441630-179") 
    addForeignKeyConstraint(baseColumnNames: "reviewer_id", baseTableName: "manuscript_review_reviewer", constraintName: "FK9BEFBBB3A28B41DF", deferrable: "false", initiallyDeferred: "false", referencedColumnNames: "id", referencedTableName: "user", referencesUniqueColumn: "false")

changeSet(author: "gdboling (generated)", id: "1306242441630-212") 
    dropColumn(columnName: "user_id", tableName: "manuscript_review_reviewer")

一切都很好。但是，我还看到很多与我的更改无关的 dropIndex 和 createIndex 块。有人知道为什么会这样吗？

【参考方案1】：

在http://jira.grails.org/browse/GPDATABASEMIGRATION 上写一个问题，提供要重现的信息（数据库供应商，最好是一些代码和您的数据库架构），我会看看可以做什么。最坏的情况是您需要将多个元素合并为一个 - 这是自动化的棘手工作，通常需要一些人工干预。