protected virtual bool OnExecute(DataUpsertContext context, SelectStatement statement)
{
//根据生成的脚本创建对应的数据命令
var command = context.Session.Build(statement);
//绑定命令参数
statement.Bind(context, command, context.Data);
using (var reader = command.ExecuteReader())
{
if (reader.Read())
{
for (int i = 0; i < reader.FieldCount; i++)
{
var schema = string.IsNullOrEmpty(statement.Alias) ? context.Schema.Find(reader.GetName(i)) : context.Schema.Find(statement.Alias);
if (schema != null)
{
if (schema.Token.Property.IsComplex && schema.Children.TryGet(reader.GetName(i), out var child))
{
schema = child;
}
schema.Token.SetValue(context.Data, reader.GetValue(i));
}
}
}
}
return(true);
}
private void BuildUpsertion(DataUpdateContext context, object data, IStatementBase master, SchemaMember schema)
{
var entityType = schema.Parent == null ? context.EntityType : schema.Parent.Token.MemberType;
//构建 Upsert 操作上下文
var upsert = new DataUpsertContext(
context.DataAccess,
schema.Token.Property.Entity.Name,
true,
data,
new Schema(schema.Token.Property.Entity, entityType, schema),
context.HasStates ? context.States : null);
//构建 Upsert 语句
var statements = context.Source.Driver.Builder.Build(upsert);
//将新建的语句加入到主语句的从属集中
foreach (var statement in statements)
{
master.Slaves.Add(statement);
}
}
