MySql DB で EF5 CodeFirst を使用しています。
私はクラス「ユーザー」を持っています
public class User
{
[Key]
public string Username { get; set; }
public string DisplayName { get; set; }
}
そして、テーブル列DisplayNameをdisplay_nameに変更したいと思います。
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<User>()
.Property(u => u.DisplayName)
.HasColumnName("display_name");
}
次に and を実行するAdd-Migration ChangeDisplayName
とUpdate-Database -Verbose
、エラーが発生しました。
Using StartUp project 'CodeFirstNewDatabaseSample'.
Using NuGet project 'CodeFirstNewDatabaseSample'.
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Target database is: 'CodeFirstNewDatabaseSample' (DataSource: localhost, Provider: MySql.Data.MySqlClient, Origin: Configuration).
Applying code-based migrations: [201301041748445_ChangeDisplayName].
Applying code-based migration: 201301041748445_ChangeDisplayName.
set @columnType := (select case lower(IS_NULLABLE) when `no` then CONCAT(column_type, ` ` , `not null `) when `yes` then column_type end from information_schema.columns where table_name = `Users` and column_name = `DisplayName` );
set @sqlstmt := (select concat(`alter table Users change `DisplayName` display_name` , @columnType));
prepare stmt @sqlstmt;
execute stmt;
deallocate prepare stmt
MySql.Data.MySqlClient.MySqlException (0x80004005): Unknown column 'no' in 'field list'
at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
at MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow, Int64& insertedId)
at MySql.Data.MySqlClient.Driver.GetResult(Int32 statementId, Int32& affectedRows, Int64& insertedId)
at MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean force)
at MySql.Data.MySqlClient.MySqlDataReader.NextResult()
at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)
at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
at System.Data.Entity.Migrations.DbMigrator.ExecuteSql(DbTransaction transaction, MigrationStatement migrationStatement)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ExecuteSql(DbTransaction transaction, MigrationStatement migrationStatement)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable`1 migrationStatements)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.ExecuteStatements(IEnumerable`1 migrationStatements)
at System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, XDocument targetModel, IEnumerable`1 operations, Boolean downgrading, Boolean auto)
at System.Data.Entity.Migrations.DbMigrator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.RunCore()
at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()
Unknown column 'no' in 'field list'
エラーはここにあると思います->
set @columnType := (select case lower(IS_NULLABLE) when `no` then CONCAT(column_type, ` ` , `not null `) when `yes` then column_type end from information_schema.columns where table_name = `Users` and column_name = `DisplayName` );
no
エラーです。
このエラーを修正するのを手伝ってください。