InternalQuery.cs 3.0 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384
  1. using Ant.Core;
  2. using Ant.Core.Visitors;
  3. using Ant.Data;
  4. using Ant.Infrastructure;
  5. using Ant.Mapper;
  6. using Ant.ORM;
  7. using Ant.Query.Mapping;
  8. using Ant.Query.QueryState;
  9. using Ant.Query.Visitors;
  10. using System.Collections;
  11. using System.Collections.Generic;
  12. using System.Data;
  13. using System.Data.SqlClient;
  14. using System.Diagnostics;
  15. namespace Ant.Query.Internals
  16. {
  17. class InternalQuery<T> : IEnumerable<T>, IEnumerable
  18. {
  19. Queryable<T> _query; DbCommandFactor _commandFactor;
  20. internal InternalQuery(Queryable<T> query)
  21. {
  22. this._query = query;
  23. this._commandFactor = GenerateCommandFactor();
  24. }
  25. /// <summary>
  26. /// 创建执行SQL语句的工厂
  27. /// </summary>
  28. /// <returns></returns>
  29. DbCommandFactor GenerateCommandFactor()
  30. {
  31. IQueryState qs = QueryExpressionVisitor.VisitQueryExpression(this._query.QueryExpression);
  32. MappingData data = qs.GenerateMappingData();//解析Lambda表达式
  33. IObjectActivator objectActivator;
  34. if (this._query._trackEntity)
  35. objectActivator = data.ObjectActivatorCreator.CreateObjectActivator(this._query.DbContext);
  36. else
  37. objectActivator = data.ObjectActivatorCreator.CreateObjectActivator();
  38. IDbExpressionTranslator translator = this._query.DbContext.DbContextServiceProvider.CreateDbExpressionTranslator();
  39. List<DbParam> parameters;
  40. string cmdText = translator.Translate(data.SqlQuery, out parameters);//解析SQL语句
  41. DbCommandFactor commandFactor = new DbCommandFactor(objectActivator, cmdText, parameters.ToArray());
  42. commandFactor.StrSql = SqlDataAccess.AppendDbCommandInfo(cmdText, parameters.ToArray());
  43. commandFactor.SqlConnection = this._query.db.ConnectionString;
  44. return commandFactor;
  45. }
  46. /// <summary>
  47. ///
  48. /// </summary>
  49. /// <returns></returns>
  50. public IEnumerator<T> GetEnumerator()
  51. {
  52. // DbCommandFactor commandFactor = this.GenerateCommandFactor();
  53. var enumerator = QueryEnumeratorCreator.CreateEnumerator<T>(this._query.db, _commandFactor);//用于返回数据对象
  54. return enumerator;
  55. }
  56. IEnumerator IEnumerable.GetEnumerator()
  57. {
  58. return this.GetEnumerator();
  59. }
  60. /// <summary>
  61. /// 为了获取SQL语句
  62. /// </summary>
  63. /// <returns></returns>
  64. public override string ToString()
  65. {
  66. //DbCommandFactor commandFactor = this.GenerateCommandFactor();
  67. return SqlDataAccess.AppendDbCommandInfo(_commandFactor.CommandText, _commandFactor.Parameters);//返回SQL语句用于记日志;
  68. }
  69. /// <summary>
  70. /// 获取数据库连接
  71. /// </summary>
  72. /// <returns></returns>
  73. public string GetDataConnection()
  74. {
  75. return _commandFactor.SqlConnection;
  76. }
  77. }
  78. }