/// <summary>
/// 初始化创建或删除关系操作。
/// </summary>
/// <param name="context">数据上下文。</param>
/// <param name="type">操作类型。</param>
/// <param name="principal">主表元数据。</param>
/// <param name="foreign">外表元数据。</param>
/// <param name="pairs">主外键对集合。</param>
internal DbCreateDropRelationOperate(DbContext context, EOperateType type,
TableMetadata principal, TableMetadata foreign, ForeignPrincipalPair[] pairs)
: base(context, typeof(object), CreateName(context, principal, foreign, pairs))
{
_Type = type;
Foreign = foreign;
Principal = principal;
Pairs = pairs;
}
/// <summary>
/// 初始化创建或删除关系操作。
/// </summary>
/// <param name="context">数据上下文。</param>
/// <param name="type">操作类型。</param>
/// <param name="principal">主表元数据。</param>
/// <param name="foreign">外表元数据。</param>
/// <param name="pairs">主外键对集合。</param>
internal DbCreateDropRelationOperate(DbContext context, EOperateType type,
TableMetadata principal, TableMetadata foreign, ForeignPrincipalPair[] pairs)
: base(context, typeof(object))
{
_Type = type;
Foreign = foreign;
Principal = principal;
Pairs = pairs;
ForeignName = $"FK_{foreign.Name}_{principal.Name}_{string.Join("_", pairs.Select(a => a.ForeignKey.Name).ToArray())}_{string.Join("_", pairs.Select(a => a.PrincipalKey.Name).ToArray())}";
}
//创建删除继承表关系。
private DbMaintenanceOperateBase CreateDropKeyRelation <TSource>(EOperateType type)
{
var table = _Metadata.Table(typeof(TSource));
if (table.InheritSets.Length > 0)
{
var principal = table.InheritSets[table.InheritSets.Length - 1];
return(new DbCreateDropRelationOperate(_Context, type
, principal, table, table.Keys.Select(a => new ForeignPrincipalPair(a, a)).ToArray()));
}
throw new InvalidOperationException(string.Format(Res.ExceptionIsNotInheritSet, typeof(TSource)));
}
/// <summary>
/// 创建操作。
/// </summary>
/// <param name="context">数据上下文。</param>
/// <param name="type">相关CLR类型。</param>
/// <param name="operateType">当前操作类型。</param>
/// <param name="name">操作对象名称。</param>
/// <param name="newName">新名称。</param>
internal DbRenameObjectOperate(DbContext context, Type type, EOperateType operateType, DbName name, string newName)
: base(context, type ?? typeof(object), name)
{
_Type = operateType;
NewName = newName;
}
//创建删除普通关系。
private IEnumerable <DbMaintenanceOperateBase> CreateDropRelation(Type source, PropertyInfo property, EOperateType type)
{
var table = _Metadata.Table(source);
var navigate = table.Navigates[property];
if (navigate.IsComposite)
{
var composite = (CompositeNavigateMetadata)navigate;
yield return(new DbCreateDropRelationOperate(_Context, type
, composite.Source, composite.RelationTable, composite.Pairs));
yield return(new DbCreateDropRelationOperate(_Context, type
, composite.Target, composite.RelationTable, composite.CompositePairs));
}
else
{
if (navigate.IsForeign.Value)
{
yield return(new DbCreateDropRelationOperate(_Context, type
, navigate.Target, navigate.Source, navigate.Pairs));
}
else
{
yield return(new DbCreateDropRelationOperate(_Context, type
, navigate.Source, navigate.Target, navigate.Pairs));
}
}
}
//创建删除普通关系。
private IEnumerable <DbMaintenanceOperateBase> CreateDropRelation(Type source, PropertyInfo property, EOperateType type)
{
var table = _Metadata.Table(source);
var navigate = table.Navigates[property];
if (navigate.IsComposite)
{
var composite = (CompositeNavigateMetadata)navigate;
yield return(new DbCreateDropRelationOperate(_Context, type
, composite.Source, composite.RelationTable, composite.Pairs));
yield return(new DbCreateDropRelationOperate(_Context, type
, composite.Target, composite.RelationTable, composite.CompositePairs));
}
else
{
DbCreateDropRelationOperate operate = null;
if (navigate.IsForeign.Value)
{
operate = new DbCreateDropRelationOperate(_Context, type
, navigate.Target, navigate.Source, navigate.Pairs);
}
else
{
operate = new DbCreateDropRelationOperate(_Context, type
, navigate.Source, navigate.Target, navigate.Pairs);
}
if (type == EOperateType.CreateRelation)
{
operate.Action = navigate.GetProperty <RelationActionAttribute>();
}
yield return(operate);
}
}
/// <summary>
/// 创建操作。
/// </summary>
/// <param name="context">数据上下文。</param>
/// <param name="type">相关CLR类型。</param>
/// <param name="operateType">当前操作类型。</param>
/// <param name="name">操作对象名称。</param>
internal DbDropObjectOperate(DbContext context, Type type, EOperateType operateType, DbName name)
: base(context, type ?? typeof(object), name)
{
_Type = operateType;
}
/// <summary>
/// 初始化创建表操作。
/// </summary>
/// <param name="context">数据上下文。</param>
/// <param name="type">数据项CLR类型。</param>
/// <param name="operateType">当前操作类型。</param>
/// <param name="name">操作对象名称。</param>
internal DbCreateTableOperate(DbContext context, Type type, EOperateType operateType, DbName name)
: base(context, type, name)
{
_Type = operateType;
}
