/// <summary>
/// 索引相关。
/// </summary>
/// <param name="command">命令。</param>
/// <param name="builder">SQL构建实例。</param>
protected override void IndexTraits(MigrationCommand command, IndentedStringBuilder builder)
{
Check.NotNull(command, nameof(command));
Check.NotNull(builder, nameof(builder));
var clustered = (command as IIndexable)?.IsCustered;
if (clustered.HasValue)
{
builder.Append(clustered.Value ? "CLUSTERED " : "NONCLUSTERED ");
}
}
/// <summary>
/// SQL代码生成器。
/// </summary>
/// <param name="command">当前迁移命令。</param>
/// <returns>返回当前命令生成的SQL代码。</returns>
public string Generate(MigrationCommand command)
{
Check.NotNull(command, nameof(command));
var builder = new IndentedStringBuilder();
Action<MigrationsSqlGenerator, MigrationCommand, IndentedStringBuilder> generateAction;
if (!_generateActions.TryGetValue(command.GetType(), out generateAction))
{
throw new Exception($"为找到类型为{command.GetType()}的命令解析器！");
}
generateAction(this, command, builder);
var sql = builder.ToString();
if (string.IsNullOrWhiteSpace(sql))
return null;
return sql;
}