Question

我首先使用EF5代码，现在我需要更新我的数据库，因此我启用了数据库迁移并添加了迁移，但生成的代码不是我需要的。这是代码：

public override void Up()
    {
        CreateTable(
            "dbo.HistoricalWeightEntities",
            c => new
                {
                    PatientMedicalDataId = c.Guid(nullable: false),
                    Id = c.Guid(nullable: false),
                    Weight = c.Single(nullable: false),
                    Date = c.DateTime(nullable: false),
                })
            .PrimaryKey(t => new { t.PatientMedicalDataId, t.Id })
            .ForeignKey("dbo.PatientMedicalDataEntities", t => t.PatientMedicalDataId, cascadeDelete: true)
            .Index(t => t.PatientMedicalDataId);

        AddColumn("dbo.PatientDataEntities", "PatientDataFilePath", c => c.String());
        //Here I need to move data from the old Weight column to the Weight column on the newly
        //created table and create the id (Guid) and the foreing key before the old 
        //column is dropped
        DropColumn("dbo.PatientMedicalDataEntities", "Weight");
    }

我需要做的是添加一些sql脚本，将数据从dbo.PatientMedicalDataEntities中的'Weight'列移动到新创建的表dbo.HistoricalWeightEntities中的Weight列，并插入Id值（键）是一个Guid和删除列之前的相应外键。有人可以告诉我这是怎么做的是sql？

提前谢谢

Answer 1

它应该是那样的（恩诺你想用Date栏做什么）

Sql("INSERT INTO HistoricalWeightEntities(Id, Weight, PatientMedicalDataId) "+
    "SELECT newid(), Weight, <theForeignKeyColumn> from PatientMedicalDataEntities");

EF5数据库迁移：如何移动数据

1 个答案: