// Bypass Initial Migration (Initial migration is DB snapshot resulting from Reverse Engineering)
public static void BypassInitialMigration(b2b_testContext context)
{
/* Create __EFMigration Table IF NOT EXISTS*/
StringBuilder createTable = new StringBuilder();
createTable.Append("if not exists" + Environment.NewLine);
createTable.Append("(select * from sysobjects where name='__EFMigrationsHistory' and xtype='U')" + Environment.NewLine);
createTable.Append("CREATE TABLE [dbo].[__EFMigrationsHistory](" + Environment.NewLine);
createTable.Append("[MigrationId] [nvarchar](150) NOT NULL," + Environment.NewLine);
createTable.Append("[ProductVersion] [nvarchar](32) NOT NULL," + Environment.NewLine);
createTable.Append("CONSTRAINT [PK___EFMigrationsHistory] PRIMARY KEY CLUSTERED" + Environment.NewLine);
createTable.Append("([MigrationId] ASC)" + Environment.NewLine);
createTable.Append("WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF," + Environment.NewLine);
createTable.Append("IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON," + Environment.NewLine);
createTable.Append("ALLOW_PAGE_LOCKS = ON) ON [PRIMARY])" + Environment.NewLine);
createTable.Append("ON [PRIMARY]" + Environment.NewLine);
string strCreate = createTable.ToString();
context.Database.ExecuteSqlCommand(createTable.ToString());
// Get 1st migration of All (Non-applied + applied)
string initialMigration = context.Database.GetMigrations()?.First();
if (!string.IsNullOrEmpty(initialMigration))
{
// Check if initial record exists in __EFMigrationsHistory Table
int count;
string query = $@"Set Nocount Off Select Count(MigrationId) From __EFMigrationsHistory Where MigrationId='{initialMigration}'";
var conn = context.Database.GetDbConnection();
try
{
conn.Open();
using (var cmd = conn.CreateCommand())
{
cmd.CommandText = query;
count = (int)cmd.ExecuteScalar();
}
}
finally
{
conn.Close();
}
// Insert record to __EFMigrationsHistory Table to bypass Initial Migration be applied
if (count != 1)
{
string spInsert =
$@"Insert Into __EFMigrationsHistory (MigrationId,ProductVersion)
Values('{initialMigration}','2.0.2-rtm-10011')";
context.Database.ExecuteSqlCommand(spInsert);
}
// Apply pending migration one-by-one except Initial Migration
var pendingMigrations = context.Database.GetPendingMigrations();
if (pendingMigrations.Any())
{
var migrator = context.Database.GetService <IMigrator>();
foreach (var targetMigration in pendingMigrations)
{
migrator.Migrate(targetMigration);
}
}
}
}
public static void Initialize(b2b_testContext context)
{
context.Database.Migrate();
}
