public override bool IsModified(MappingEntity entity, object instance, object original)
{
if (base.IsModified(entity, instance, original))
return true;
// need to check nested entities too
foreach (var mi in this.GetMappedMembers(entity))
{
if (this.IsNestedEntity(entity, mi))
{
MappingEntity nested = this.GetRelatedEntity(entity, mi);
if (this.IsModified(nested, mi.GetValue(instance), mi.GetValue(original)))
return true;
}
}
return false;
}
public override object CloneEntity(MappingEntity entity, object instance)
{
object clone = base.CloneEntity(entity, instance);
// need to clone nested entities too
foreach (var mi in this.GetMappedMembers(entity))
{
if (this.IsNestedEntity(entity, mi))
{
MappingEntity nested = this.GetRelatedEntity(entity, mi);
var nestedValue = mi.GetValue(instance);
if (nestedValue != null)
{
var nestedClone = this.CloneEntity(nested, mi.GetValue(instance));
mi.SetValue(clone, nestedClone);
}
}
}
return clone;
}
// make a variable declaration / initialization for dependent generated values
private CommandExpression GetDependentGeneratedVariableDeclaration(MappingEntity entity, MappingTable table, List<MemberInfo> members, Expression instance, Dictionary<MemberInfo, Expression> map)
{
// first make command that retrieves the generated ids if any
DeclarationCommand genIdCommand = null;
var generatedIds = this.mapping.GetMappedMembers(entity).Where(m => this.mapping.IsPrimaryKey(entity, m) && this.mapping.IsIdentity(entity, m)).ToList();
if (generatedIds.Count > 0)
{
genIdCommand = this.GetGeneratedIdCommand(entity, members, map);
// if that's all there is then just return the generated ids
if (members.Count == generatedIds.Count)
{
return genIdCommand;
}
}
// next make command that retrieves the generated members
// only consider members that were not generated ids
members = members.Except(generatedIds).ToList();
var tableAlias = new TableAlias();
var tex = new TableExpression(tableAlias, entity, this.mapping.GetTableName(table));
Expression where = null;
if (generatedIds.Count > 0)
{
where = generatedIds.Select((m, i) =>
this.GetMemberExpression(tex, entity, m).Equal(map[m])
).Aggregate((x, y) => x.And(y));
}
else
{
where = this.GetIdentityCheck(tex, entity, instance);
}
TableAlias selectAlias = new TableAlias();
var columns = new List<ColumnDeclaration>();
var variables = new List<VariableDeclaration>();
foreach (var mi in members)
{
ColumnExpression col = (ColumnExpression)this.GetMemberExpression(tex, entity, mi);
columns.Add(new ColumnDeclaration(this.mapping.GetColumnName(entity, mi), col, col.QueryType));
ColumnExpression vcol = new ColumnExpression(col.Type, col.QueryType, selectAlias, col.Name);
variables.Add(new VariableDeclaration(mi.Name, col.QueryType, vcol));
map.Add(mi, new VariableExpression(mi.Name, col.Type, col.QueryType));
}
var genMembersCommand = new DeclarationCommand(variables, new SelectExpression(selectAlias, columns, tex, where));
if (genIdCommand != null)
{
return new BlockCommand(genIdCommand, genMembersCommand);
}
return genMembersCommand;
}
/// <summary> /// Get an expression that represents the delete operation for the specified instance. /// </summary> /// <param name="entity"></param> /// <param name="instance"></param> /// <param name="deleteCheck"></param> /// <returns></returns> public abstract Expression GetDeleteExpression(MappingEntity entity, Expression instance, LambdaExpression deleteCheck);
/// <summary> /// Get an expression that represents the update operation for the specified instance. /// </summary> /// <param name="entity">The entity.</param> /// <param name="instance">The instance.</param> /// <param name="updateCheck">The update check.</param> /// <param name="selector">The selector.</param> /// <param name="indeedColumns">The indeed columns.</param> /// <param name="else">The @else.</param> /// <returns></returns> public abstract Expression GetUpdateExpression(MappingEntity entity, Expression instance, LambdaExpression updateCheck, LambdaExpression selector, ColumnIndeedExpression indeedColumns, Expression @else);
/// <summary> /// Get an expression that represents the insert operation for the specified instance. /// </summary> /// <param name="entity"></param> /// <param name="instance">The instance to insert.</param> /// <param name="selector">A lambda expression that computes a return value from the operation.</param> /// <returns></returns> public abstract Expression GetInsertExpression(MappingEntity entity, Expression instance, LambdaExpression selector);
/// <summary> /// Gets an expression that constructs an entity instance relative to a root. /// The root is most often a TableExpression, but may be any other experssion such as /// a ConstantExpression. /// </summary> /// <param name="root"></param> /// <param name="entity"></param> /// <returns></returns> public abstract EntityExpression GetEntityExpression(Expression root, MappingEntity entity);
/// <summary> /// Determines whether the specified entity is modified. /// </summary> /// <param name="entity">The entity.</param> /// <param name="instance">The instance.</param> /// <param name="original">The original.</param> /// <returns> /// <c>true</c> if the specified entity is modified; otherwise, <c>false</c>. /// </returns> public abstract bool IsModified(MappingEntity entity, object instance, object original);
/// <summary> /// Gets the depending entities. /// </summary> /// <param name="entity">The entity.</param> /// <param name="instance">The instance.</param> /// <returns></returns> public abstract IEnumerable<EntityInfo> GetDependingEntities(MappingEntity entity, object instance);
public override Expression GetDeleteExpression(MappingEntity entity, Expression instance, LambdaExpression deleteCheck)
{
var tables = this.mapping.GetTables(entity);
if (tables.Count < 2)
{
return base.GetDeleteExpression(entity, instance, deleteCheck);
}
var commands = new List<Expression>();
foreach (var table in this.GetDependencyOrderedTables(entity).Reverse())
{
TableExpression tex = new TableExpression(new TableAlias(), entity, this.mapping.GetTableName(table));
var where = this.GetIdentityCheck(tex, entity, instance);
commands.Add(new DeleteCommand(tex, where));
}
Expression block = new BlockCommand(commands);
if (deleteCheck != null)
{
var test = this.GetEntityStateTest(entity, instance, deleteCheck);
return new IFCommand(test, block, null);
}
return block;
}
private Expression GetIdentityCheck(TableExpression root, MappingEntity entity, Expression instance, MappingTable table)
{
if (this.mapping.IsExtensionTable(table))
{
var keyColNames = this.mapping.GetExtensionKeyColumnNames(table).ToArray();
var relatedMembers = this.mapping.GetExtensionRelatedMembers(table).ToArray();
Expression where = null;
for (int i = 0, n = keyColNames.Length; i < n; i++)
{
var relatedMember = relatedMembers[i];
var cex = new ColumnExpression(TypeHelper.GetMemberType(relatedMember), this.GetColumnType(entity, relatedMember), root.Alias, keyColNames[n]);
var nex = this.GetMemberExpression(instance, entity, relatedMember);
var eq = cex.Equal(nex);
where = (where != null) ? where.And(eq) : where;
}
return where;
}
else
{
return base.GetIdentityCheck(root, entity, instance);
}
}
public override Expression GetUpdateExpression(MappingEntity entity, Expression instance, LambdaExpression updateCheck, LambdaExpression selector, Expression @else)
{
var tables = this.mapping.GetTables(entity);
if (tables.Count < 2)
{
return base.GetUpdateExpression(entity, instance, updateCheck, selector, @else);
}
var commands = new List<Expression>();
foreach (var table in this.GetDependencyOrderedTables(entity))
{
TableExpression tex = new TableExpression(new TableAlias(), entity, this.mapping.GetTableName(table));
var assignments = this.GetColumnAssignments(tex, instance, entity, (e, m) => this.mapping.GetAlias(e, m) == this.mapping.GetAlias(table) && this.mapping.IsUpdatable(e, m), null);
var where = this.GetIdentityCheck(tex, entity, instance);
commands.Add(new UpdateCommand(tex, where, assignments));
}
if (selector != null)
{
commands.Add(
new IFCommand(
this.Translator.Linguist.Language.GetRowsAffectedExpression(commands[commands.Count-1]).GreaterThan(Expression.Constant(0)),
this.GetUpdateResult(entity, instance, selector),
@else
)
);
}
else if (@else != null)
{
commands.Add(
new IFCommand(
this.Translator.Linguist.Language.GetRowsAffectedExpression(commands[commands.Count-1]).LessThanOrEqual(Expression.Constant(0)),
@else,
null
)
);
}
Expression block = new BlockCommand(commands);
if (updateCheck != null)
{
var test = this.GetEntityStateTest(entity, instance, updateCheck);
return new IFCommand(test, block, null);
}
return block;
}
private IEnumerable<ColumnAssignment> GetRelatedColumnAssignments(Expression expr, MappingEntity entity, MappingTable table, Dictionary<MemberInfo, Expression> map)
{
if (this.mapping.IsExtensionTable(table))
{
var keyColumns = this.mapping.GetExtensionKeyColumnNames(table).ToArray();
var relatedMembers = this.mapping.GetExtensionRelatedMembers(table).ToArray();
for (int i = 0, n = keyColumns.Length; i < n; i++)
{
MemberInfo member = relatedMembers[i];
Expression exp = map[member];
yield return new ColumnAssignment((ColumnExpression)this.GetMemberExpression(expr, entity, member), exp);
}
}
}
public override bool IsRelationship(MappingEntity entity, MemberInfo member)
{
return base.IsRelationship(entity, member)
|| this.IsNestedEntity(entity, member);
}
private IEnumerable<ColumnAssignment> GetColumnAssignments(
Expression table, Expression instance, MappingEntity entity,
Func<MappingEntity, MemberInfo, bool> fnIncludeColumn,
Dictionary<MemberInfo, Expression> map)
{
foreach (var m in this.mapping.GetMappedMembers(entity))
{
if (this.mapping.IsColumn(entity, m) && fnIncludeColumn(entity, m))
{
yield return new ColumnAssignment(
(ColumnExpression)this.GetMemberExpression(table, entity, m),
this.GetMemberAccess(instance, m, map)
);
}
else if (this.mapping.IsNestedEntity(entity, m))
{
var assignments = this.GetColumnAssignments(
table,
Expression.MakeMemberAccess(instance, m),
this.mapping.GetRelatedEntity(entity, m),
fnIncludeColumn,
map
);
foreach (var ca in assignments)
{
yield return ca;
}
}
}
}
/// <summary> /// 获取映射实体对象的主键对象。 /// </summary> /// <param name="entity">The entity.</param> /// <param name="instance">The instance.</param> /// <returns></returns> public abstract object GetPrimaryKey(MappingEntity entity, object instance);
/// <summary> /// 通过表达式获取映射实体对象的主键对象。 /// </summary> /// <param name="entity">The entity.</param> /// <param name="source">The source.</param> /// <param name="keys">The keys.</param> /// <returns></returns> public abstract Expression GetPrimaryKeyQuery(MappingEntity entity, Expression source, Expression[] keys);
public virtual IEnumerable<MappingTable> GetDependencyOrderedTables(MappingEntity entity)
{
var lookup = this.mapping.GetTables(entity).ToLookup(t => this.mapping.GetAlias(t));
return this.mapping.GetTables(entity).Sort(t => this.mapping.IsExtensionTable(t) ? lookup[this.mapping.GetExtensionRelatedAlias(t)] : null);
}
/// <summary> /// Clones the entity. /// </summary> /// <param name="entity">The entity.</param> /// <param name="instance">The instance.</param> /// <returns></returns> public abstract object CloneEntity(MappingEntity entity, object instance);
/// <summary> /// 获取映射实体的成员列表。 /// </summary> /// <param name="entity">The entity.</param> /// <returns></returns> public abstract IEnumerable<MemberInfo> GetMappedMembers(MappingEntity entity);
/// <summary> /// Get a query expression that selects all entities from a table /// </summary> /// <param name="entity">The entity.</param> /// <returns></returns> public abstract ProjectionExpression GetQueryExpression(MappingEntity entity);
/// <summary> /// 判断指定的映射实体成员是否是主键列。 /// </summary> /// <param name="entity"></param> /// <param name="member"></param> /// <returns></returns> public abstract bool IsPrimaryKey(MappingEntity entity, MemberInfo member);
/// <summary> /// Get an expression for a mapped property relative to a root expression. /// The root is either a TableExpression or an expression defining an entity instance. /// </summary> /// <param name="root"></param> /// <param name="entity"></param> /// <param name="member"></param> /// <returns></returns> public abstract Expression GetMemberExpression(Expression root, MappingEntity entity, MemberInfo member);
/// <summary>
/// Gets the primary key members.
/// </summary>
/// <param name="entity">The entity.</param>
/// <returns></returns>
public virtual IEnumerable<MemberInfo> GetPrimaryKeyMembers(MappingEntity entity)
{
return this.GetMappedMembers(entity).Where(m => this.IsPrimaryKey(entity, m));
}
/// <summary> /// Get an expression that represents the insert operation for the specified instance. /// </summary> /// <param name="entity">The entity.</param> /// <param name="instance">The instance to insert.</param> /// <param name="selector">A lambda expression that computes a return value from the operation.</param> /// <param name="indeedColumns">指定需要插入的列.</param> /// <returns></returns> public abstract Expression GetInsertExpression(MappingEntity entity, Expression instance, LambdaExpression selector, ColumnIndeedExpression indeedColumns);
/// <summary> /// 判断指定映射实体的成员是否被影射为关联实体。 /// </summary> /// <param name="entity">指定映射实体</param> /// <param name="member">成员</param> /// <returns></returns> public abstract bool IsRelationship(MappingEntity entity, MemberInfo member);
/// <summary> /// Get an expression that represents the insert-or-update operation for the specified instance. /// </summary> /// <param name="entity"></param> /// <param name="instance"></param> /// <param name="updateCheck"></param> /// <param name="resultSelector"></param> /// <returns></returns> public abstract Expression GetInsertOrUpdateExpression(MappingEntity entity, Expression instance, LambdaExpression updateCheck, LambdaExpression resultSelector);
/// <summary>
/// Determines if a relationship property refers to a single entity (as opposed to a collection.)
/// 判断知道的映射实体的成员是否是单一实体映射关联。
/// </summary>
/// <param name="entity">The entity.</param>
/// <param name="member">The member.</param>
/// <returns>
/// <c>true</c> if [is singleton relationship] [the specified entity]; otherwise, <c>false</c>.
/// </returns>
public virtual bool IsSingletonRelationship(MappingEntity entity, MemberInfo member)
{
if (!this.IsRelationship(entity, member))
return false;
Type ieType = TypeHelper.FindIEnumerable(TypeHelper.GetMemberType(member));
return ieType == null;
}
/// <summary>
/// Initializes a new instance of the <see cref="EntityInfo"/> struct.
/// </summary>
/// <param name="instance">The instance.</param>
/// <param name="mapping">The mapping.</param>
public EntityInfo(object instance, MappingEntity mapping)
{
this.instance = instance;
this.mapping = mapping;
}
private Dictionary<string, List<MemberInfo>> GetDependentGeneratedColumns(MappingEntity entity)
{
return
(from xt in this.mapping.GetTables(entity).Where(t => this.mapping.IsExtensionTable(t))
group xt by this.mapping.GetExtensionRelatedAlias(xt))
.ToDictionary(
g => g.Key,
g => g.SelectMany(xt => this.mapping.GetExtensionRelatedMembers(xt)).Distinct().ToList()
);
}
