private IStatementBase BuildUpsertion(IStatementBase master, SchemaMember schema)
{
var complex = (IEntityComplexPropertyMetadata)schema.Token.Property;
var statement = new UpsertStatement(complex.Foreign, schema);
foreach (var member in schema.Children)
{
if (member.Token.Property.IsComplex)
{
continue;
}
var property = (IEntitySimplexPropertyMetadata)member.Token.Property;
var field = statement.Table.CreateField(property);
var parameter = this.IsLinked(complex, property) ?
Expression.Parameter(property.Name, property.Type) :
Expression.Parameter(ParameterExpression.Anonymous, member, field);
//设置参数的默认值
parameter.Value = property.Value;
statement.Fields.Add(field);
statement.Values.Add(parameter);
statement.Parameters.Add(parameter);
}
//将新建的语句加入到主语句的从属集中
master.Slaves.Add(statement);
return(statement);
}
private IEnumerable <UpsertStatement> BuildStatements(IEntityMetadata entity, SchemaMember owner, IEnumerable <SchemaMember> schemas)
{
var inherits = entity.GetInherits();
foreach (var inherit in inherits)
{
var statement = new UpsertStatement(inherit, owner);
foreach (var schema in schemas)
{
if (!inherit.Properties.Contains(schema.Name))
{
continue;
}
if (schema.Token.Property.IsSimplex)
{
var simplex = (IEntitySimplexPropertyMetadata)schema.Token.Property;
if (simplex.Sequence != null && simplex.Sequence.IsBuiltin)
{
statement.Sequence = new SelectStatement(owner?.FullPath);
statement.Sequence.Select.Members.Add(SequenceExpression.Current(simplex.Sequence.Name, simplex.Name));
}
else
{
var field = statement.Table.CreateField(schema.Token);
statement.Fields.Add(field);
var parameter = this.IsLinked(owner, simplex) ?
Expression.Parameter(schema.Token.Property.Name, simplex.Type) :
Expression.Parameter(ParameterExpression.Anonymous, schema, field);
statement.Values.Add(parameter);
statement.Parameters.Add(parameter);
}
}
else
{
if (!schema.HasChildren)
{
throw new DataException($"Missing members that does not specify '{schema.FullPath}' complex property.");
}
var complex = (IEntityComplexPropertyMetadata)schema.Token.Property;
var slaves = this.BuildStatements(complex.Foreign, schema, schema.Children);
foreach (var slave in slaves)
{
slave.Schema = schema;
statement.Slaves.Add(slave);
}
}
}
yield return(statement);
}
}
internal static IEnumerable <UpsertStatement> BuildUpserts(IDataMutateContextBase context, IDataEntity entity, object data, SchemaMember owner, IEnumerable <SchemaMember> schemas)
{
var inherits = entity.GetInherits();
foreach (var inherit in inherits)
{
var statement = new UpsertStatement(inherit, owner);
foreach (var schema in schemas)
{
if (!inherit.Properties.Contains(schema.Name))
{
continue;
}
if (schema.Token.Property.IsSimplex)
{
var simplex = (IDataEntitySimplexProperty)schema.Token.Property;
if (simplex.Sequence != null && simplex.Sequence.IsBuiltin)
{
statement.Sequence = new SelectStatement(owner?.FullPath);
statement.Sequence.Select.Members.Add(SequenceExpression.Current(simplex.Sequence.Name, simplex.Name));
}
else
{
//确认当前成员是否有提供的写入值
var provided = context.Validate(DataAccessMethod.Insert, simplex, out var value);
var field = statement.Table.CreateField(schema.Token);
statement.Fields.Add(field);
var parameter = Utility.IsLinked(owner, simplex) ?
(
provided ?
Expression.Parameter(schema.Token.Property.Name, simplex.Type, value) :
Expression.Parameter(schema.Token.Property.Name, simplex.Type)
) :
(
provided ?
Expression.Parameter(field, schema, value) :
Expression.Parameter(field, schema)
);
statement.Values.Add(parameter);
statement.Parameters.Add(parameter);
//处理完新增子句部分，接着再处理修改子句部分
if (!simplex.IsPrimaryKey && !simplex.Immutable && Utility.IsGenerateRequired(ref data, schema.Name))
{
//确认当前成员是否有提供的写入值
if (context.Validate(DataAccessMethod.Update, simplex, out value))
{
parameter = Expression.Parameter(field, schema, value);
statement.Parameters.Add(parameter);
}
//如果当前的数据成员类型为递增步长类型则生成递增表达式
if (schema.Token.MemberType == typeof(Interval))
{
/*
* 注：默认参数类型为对应字段的类型，而该字段类型可能为无符号整数，
* 因此当参数类型为无符号整数并且步长为负数(递减)，则可能导致参数类型转换溢出，
* 所以必须将该参数类型重置为有符号整数（32位整数）。
*/
parameter.DbType = System.Data.DbType.Int32;
//字段设置项的值为字段加参数的加法表达式
statement.Updation.Add(new FieldValue(field, field.Add(parameter)));
}
else
{
statement.Updation.Add(new FieldValue(field, parameter));
}
}
}
}
else
{
//不可变复合属性不支持任何写操作，即在修改操作中不能包含不可变复合属性
if (schema.Token.Property.Immutable)
{
throw new DataException($"The '{schema.FullPath}' is an immutable complex(navigation) property and does not support the upsert operation.");
}
if (!schema.HasChildren)
{
throw new DataException($"Missing members that does not specify '{schema.FullPath}' complex property.");
}
var complex = (IDataEntityComplexProperty)schema.Token.Property;
var slaves = BuildUpserts(
context,
complex.Foreign,
null,
schema,
schema.Children);
foreach (var slave in slaves)
{
slave.Schema = schema;
statement.Slaves.Add(slave);
}
}
}
if (statement.Fields.Count > 0)
{
yield return(statement);
}
}
}
internal static IEnumerable <UpsertStatement> BuildUpserts(IDataMutateContextBase context, IDataEntity entity, object data, SchemaMember owner, IEnumerable <SchemaMember> schemas)
{
var inherits = entity.GetInherits();
//更新当前操作的容器数据
if (data != null && owner != null)
{
/*
* 如果从当前容器数据中获取指定成员值失败，则：
* 1). 容器数据是集合类型，无法确定从集合中的哪个元素来获取指定成员的值，因此设置上下文数据为空；
* 2). 容器数据不是集合类型，则说明指定的成员可能有误或发生了内部错误，因此抛出异常。
*/
if (owner.Token.TryGetValue(data, null, out var value))
{
data = value;
}
else if (Zongsoft.Common.TypeExtension.IsEnumerable(data.GetType()))
{
data = null;
}
else
{
throw new DataException($"Cannot get the specified '{owner.Name}' member from the '{data.GetType().FullName}' type.");
}
}
foreach (var inherit in inherits)
{
var statement = new UpsertStatement(inherit, owner);
var sequences = new List <IDataEntitySimplexProperty>();
foreach (var schema in schemas)
{
if (!inherit.Properties.Contains(schema.Name))
{
continue;
}
if (schema.Token.Property.IsSimplex)
{
var simplex = (IDataEntitySimplexProperty)schema.Token.Property;
if (simplex.Sequence != null && simplex.Sequence.IsBuiltin)
{
statement.Sequence = new SelectStatement(owner?.FullPath);
statement.Sequence.Select.Members.Add(SequenceExpression.Current(simplex.Sequence.Name, simplex.Name));
}
else
{
//确认当前成员是否有提供的写入值
var provided = context.Validate(DataAccessMethod.Insert, simplex, out var value);
var field = statement.Table.CreateField(schema.Token);
statement.Fields.Add(field);
var parameter = Utility.IsLinked(owner, simplex) ?
(
provided ?
Expression.Parameter(schema.Token.Property.Name, simplex.Type, value) :
Expression.Parameter(schema.Token.Property.Name, simplex.Type)
) :
(
provided ?
Expression.Parameter(field, schema, value) :
Expression.Parameter(field, schema)
);
statement.Values.Add(parameter);
statement.Parameters.Add(parameter);
/* 开始处理修改子句部分 */
//注：可能因为非主键的唯一约束导致新增部分失败，
//因此必须对含有外部序列字段的UPSERT语句，增加一个重新获取这些外部序列字段的附属查询语句。
if (simplex.Sequence != null && !context.IsMultiple)
{
sequences.Add(simplex);
}
//忽略不可变字段和序列字段
if (simplex.Immutable || simplex.Sequence != null)
{
continue;
}
if (owner == null)
{
if (!Utility.IsGenerateRequired(ref data, schema.Name))
{
continue;
}
}
else
{
//只有一对一(零)的导航属性才需要验证对应的字段值是否变更过，如果没有变更则忽略当前字段
if (owner.Token.Property is IDataEntityComplexProperty complex &&
complex.Multiplicity != DataAssociationMultiplicity.Many &&
!Utility.IsGenerateRequired(ref data, schema.Name))
{
continue;
}
}
//确认当前成员是否有提供的写入值
if (context.Validate(DataAccessMethod.Update, simplex, out value))
{
parameter = Expression.Parameter(field, schema, value);
statement.Parameters.Add(parameter);
}
//如果当前的数据成员类型为递增步长类型则生成递增表达式
if (schema.Token.MemberType == typeof(Interval))
{
/*
* 注：默认参数类型为对应字段的类型，而该字段类型可能为无符号整数，
* 因此当参数类型为无符号整数并且步长为负数(递减)，则可能导致参数类型转换溢出，
* 所以必须将该参数类型重置为有符号整数（32位整数）。
*/
parameter.DbType = System.Data.DbType.Int32;
//字段设置项的值为字段加参数的加法表达式
statement.Updation.Add(new FieldValue(field, field.Add(parameter)));
}
else
{
statement.Updation.Add(new FieldValue(field, parameter));
}
}
}
else
{
//不可变复合属性不支持任何写操作，即在修改操作中不能包含不可变复合属性
if (schema.Token.Property.Immutable)
{
throw new DataException($"The '{schema.FullPath}' is an immutable complex(navigation) property and does not support the upsert operation.");
}
if (!schema.HasChildren)
{
throw new DataException($"Missing members that does not specify '{schema.FullPath}' complex property.");
}
var complex = (IDataEntityComplexProperty)schema.Token.Property;
var slaves = BuildUpserts(
context,
complex.Foreign,
data,
schema,
schema.Children);
foreach (var slave in slaves)
{
slave.Schema = schema;
statement.Slaves.Add(slave);
}
}
}
//构建重新获取外部序列字段的附属查询语句
if (sequences != null && sequences.Count > 0)
{
var selection = new SelectStatement(inherit, owner?.FullPath);
for (int i = 0; i < sequences.Count; i++)
{
selection.Select.Members.Add(selection.CreateField(sequences[i]));
}
var conditions = ConditionExpression.And();
foreach (var fieldSetter in statement.Updation)
{
conditions.Add(Expression.Equal(fieldSetter.Field, fieldSetter.Value));
}
if (conditions.Count > 0)
{
if (statement.HasParameters)
{
foreach (var parameter in statement.Parameters)
{
selection.Parameters.Add(parameter);
}
}
selection.Where = conditions;
statement.Slaves.Add(selection);
}
}
if (statement.Fields.Count > 0)
{
yield return(statement);
}
}
}