QueryStateBase.cs 12 KB

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  1. using Ant.DbExpressions;
  2. using Ant.Query.Mapping;
  3. using Ant.Query.QueryExpressions;
  4. using Ant.Query.Visitors;
  5. using Ant.Utility;
  6. using System;
  7. using System.Collections.Generic;
  8. using System.Linq.Expressions;
  9. using System.Linq;
  10. using Ant.Core.Visitors;
  11. using Ant.Common;
  12. using Ant.ORM;
  13. namespace Ant.Query.QueryState
  14. {
  15. abstract class QueryStateBase : IQueryState
  16. {
  17. ResultElement _resultElement;
  18. List<IMappingObjectExpression> _moeList = null;
  19. protected QueryStateBase(ResultElement resultElement)
  20. {
  21. this._resultElement = resultElement;
  22. }
  23. protected List<IMappingObjectExpression> MoeList
  24. {
  25. get
  26. {
  27. if (this._moeList == null)
  28. this._moeList = new List<IMappingObjectExpression>(1) { this._resultElement.MappingObjectExpression };
  29. return this._moeList;
  30. }
  31. }
  32. public virtual ResultElement Result
  33. {
  34. get
  35. {
  36. return this._resultElement;
  37. }
  38. }
  39. public virtual IQueryState Accept(WhereExpression exp)
  40. {
  41. DbExpression dbExp = FilterPredicateExpressionVisitor.VisitFilterPredicate(exp.Expression, this.MoeList);
  42. this._resultElement.AppendCondition(dbExp);
  43. return this;
  44. }
  45. public virtual IQueryState Accept(OrderExpression exp)
  46. {
  47. if (exp.NodeType == QueryExpressionType.OrderBy || exp.NodeType == QueryExpressionType.OrderByDesc)
  48. this._resultElement.Orderings.Clear();
  49. DbOrdering ordering = VisistOrderExpression(this.MoeList, exp);
  50. if (this._resultElement.OrderingsComeFromSubQuery)
  51. {
  52. this._resultElement.Orderings.Clear();
  53. this._resultElement.OrderingsComeFromSubQuery = false;
  54. }
  55. this._resultElement.Orderings.Add(ordering);
  56. return this;
  57. }
  58. public virtual IQueryState Accept(SelectExpression exp)
  59. {
  60. ResultElement result = this.CreateNewResult(exp.Selector);
  61. return this.CreateQueryState(result);
  62. }
  63. public virtual IQueryState Accept(SkipExpression exp)
  64. {
  65. SkipQueryState state = new SkipQueryState(this.Result, exp.Count);
  66. return state;
  67. }
  68. public virtual IQueryState Accept(TakeExpression exp)
  69. {
  70. TakeQueryState state = new TakeQueryState(this.Result, exp.Count);
  71. return state;
  72. }
  73. public virtual IQueryState Accept(AggregateQueryExpression exp)
  74. {
  75. List<DbExpression> dbParameters = new List<DbExpression>(exp.Parameters.Count);
  76. foreach (Expression pExp in exp.Parameters)
  77. {
  78. var dbExp = GeneralExpressionVisitor.VisitPredicate((LambdaExpression)pExp, this.MoeList);
  79. dbParameters.Add(dbExp);
  80. }
  81. DbAggregateExpression dbAggregateExp = new DbAggregateExpression(exp.ElementType, exp.Method, dbParameters);
  82. MappingFieldExpression mfe = new MappingFieldExpression(exp.ElementType, dbAggregateExp);
  83. ResultElement result = new ResultElement();
  84. result.MappingObjectExpression = mfe;
  85. result.FromTable = this._resultElement.FromTable;
  86. result.AppendCondition(this._resultElement.Condition);
  87. AggregateQueryState state = new AggregateQueryState(result);
  88. return state;
  89. }
  90. public virtual IQueryState Accept(GroupingQueryExpression exp)
  91. {
  92. List<IMappingObjectExpression> moeList = this.MoeList;
  93. foreach (var item in exp.GroupPredicates)
  94. {
  95. var dbExp = GeneralExpressionVisitor.VisitPredicate(item, moeList);
  96. this._resultElement.GroupSegments.Add(dbExp);
  97. }
  98. foreach (var item in exp.HavingPredicates)
  99. {
  100. var dbExp = GeneralExpressionVisitor.VisitPredicate(item, moeList);
  101. this._resultElement.AppendHavingCondition(dbExp);
  102. }
  103. var newResult = this.CreateNewResult(exp.Selector);
  104. return new GroupingQueryState(newResult);
  105. }
  106. public virtual ResultElement CreateNewResult(LambdaExpression selector)
  107. {
  108. ResultElement result = new ResultElement();
  109. result.FromTable = this._resultElement.FromTable;
  110. IMappingObjectExpression r = SelectorExpressionVisitor.VisitSelectExpression(selector, this.MoeList);
  111. result.MappingObjectExpression = r;
  112. result.Orderings.AddRange(this._resultElement.Orderings);
  113. result.AppendCondition(this._resultElement.Condition);
  114. result.GroupSegments.AddRange(this._resultElement.GroupSegments);
  115. result.AppendHavingCondition(this._resultElement.HavingCondition);
  116. return result;
  117. }
  118. public virtual IQueryState CreateQueryState(ResultElement result)
  119. {
  120. return new GeneralQueryState(result);
  121. }
  122. public virtual MappingData GenerateMappingData()
  123. {
  124. MappingData data = new MappingData();
  125. DbSqlQueryExpression sqlQuery = this.CreateSqlQuery();
  126. var objectActivatorCreator = this._resultElement.MappingObjectExpression.GenarateObjectActivatorCreator(sqlQuery);
  127. data.SqlQuery = sqlQuery;
  128. data.ObjectActivatorCreator = objectActivatorCreator;
  129. return data;
  130. }
  131. public virtual GeneralQueryState AsSubQueryState()
  132. {
  133. DbSqlQueryExpression sqlQuery = this.CreateSqlQuery();
  134. DbSubQueryExpression subQuery = new DbSubQueryExpression(sqlQuery);
  135. ResultElement result = new ResultElement();
  136. DbTableSegment tableSeg = new DbTableSegment(subQuery, result.GenerateUniqueTableAlias());
  137. DbFromTableExpression fromTable = new DbFromTableExpression(tableSeg);
  138. result.FromTable = fromTable;
  139. DbTable table = new DbTable(tableSeg.Alias);
  140. //TODO 根据旧的生成新 MappingMembers
  141. IMappingObjectExpression newMoe = this.Result.MappingObjectExpression.ToNewObjectExpression(sqlQuery, table);
  142. result.MappingObjectExpression = newMoe;
  143. //得将 subQuery.SqlQuery.Orders 告诉 以下创建的 result
  144. //将 orderPart 传递下去
  145. if (this.Result.Orderings.Count > 0)
  146. {
  147. for (int i = 0; i < this.Result.Orderings.Count; i++)
  148. {
  149. DbOrdering ordering = this.Result.Orderings[i];
  150. DbExpression orderingExp = ordering.Expression;
  151. string alias = null;
  152. DbColumnSegment columnExpression = sqlQuery.ColumnSegments.Where(a => DbExpressionEqualityComparer.EqualsCompare(orderingExp, a.Body)).FirstOrDefault();
  153. // 对于重复的则不需要往 sqlQuery.Columns 重复添加了
  154. if (columnExpression != null)
  155. {
  156. alias = columnExpression.Alias;
  157. }
  158. else
  159. {
  160. alias = OrmUtils.GenerateUniqueColumnAlias(sqlQuery);
  161. DbColumnSegment columnSeg = new DbColumnSegment(orderingExp, alias);
  162. sqlQuery.ColumnSegments.Add(columnSeg);
  163. }
  164. DbColumnAccessExpression columnAccessExpression = new DbColumnAccessExpression(orderingExp.Type, table, alias);
  165. result.Orderings.Add(new DbOrdering(columnAccessExpression, ordering.OrderType));
  166. }
  167. }
  168. result.OrderingsComeFromSubQuery = true;
  169. GeneralQueryState queryState = new GeneralQueryState(result);
  170. return queryState;
  171. }
  172. /// <summary>
  173. /// 创建组装查询SQL
  174. /// </summary>
  175. /// <returns></returns>
  176. public virtual DbSqlQueryExpression CreateSqlQuery()
  177. {
  178. DbSqlQueryExpression sqlQuery = new DbSqlQueryExpression();
  179. sqlQuery.Table = this._resultElement.FromTable;
  180. sqlQuery.Orderings.AddRange(this._resultElement.Orderings);
  181. sqlQuery.Condition = this._resultElement.Condition;
  182. sqlQuery.GroupSegments.AddRange(this._resultElement.GroupSegments);
  183. sqlQuery.HavingCondition = this._resultElement.HavingCondition;
  184. return sqlQuery;
  185. }
  186. protected static DbOrdering VisistOrderExpression(List<IMappingObjectExpression> moeList, OrderExpression orderExp)
  187. {
  188. DbExpression dbExpression = GeneralExpressionVisitor.VisitPredicate(orderExp.Expression, moeList);
  189. OrderType orderType;
  190. if (orderExp.NodeType == QueryExpressionType.OrderBy || orderExp.NodeType == QueryExpressionType.ThenBy)
  191. {
  192. orderType = OrderType.Asc;
  193. }
  194. else if (orderExp.NodeType == QueryExpressionType.OrderByDesc || orderExp.NodeType == QueryExpressionType.ThenByDesc)
  195. {
  196. orderType = OrderType.Desc;
  197. }
  198. else
  199. throw new NotSupportedException(orderExp.NodeType.ToString());
  200. DbOrdering ordering = new DbOrdering(dbExpression, orderType);
  201. return ordering;
  202. }
  203. /// <summary>
  204. ///
  205. /// </summary>
  206. /// <returns></returns>
  207. public virtual FromQueryResult ToFromQueryResult()
  208. {
  209. DbSqlQueryExpression sqlQuery = this.CreateSqlQuery();
  210. DbSubQueryExpression subQuery = new DbSubQueryExpression(sqlQuery);
  211. DbTableSegment tableSeg = new DbTableSegment(subQuery, UtilConstants.DefaultTableAlias);
  212. DbFromTableExpression fromTable = new DbFromTableExpression(tableSeg);
  213. DbTable table = new DbTable(tableSeg.Alias);
  214. IMappingObjectExpression newMoe = this.Result.MappingObjectExpression.ToNewObjectExpression(sqlQuery, table);
  215. FromQueryResult result = new FromQueryResult();
  216. result.FromTable = fromTable;
  217. result.MappingObjectExpression = newMoe;
  218. return result;
  219. }
  220. /// <summary>
  221. /// 拼接Jion的SQL语句
  222. /// </summary>
  223. /// <param name="joinType"></param>
  224. /// <param name="conditionExpression"></param>
  225. /// <param name="fromTable"></param>
  226. /// <param name="moeList"></param>
  227. /// <param name="tableAlias"></param>
  228. /// <returns></returns>
  229. public virtual JoinQueryResult ToJoinQueryResult(JoinType joinType, LambdaExpression conditionExpression, DbFromTableExpression fromTable, List<IMappingObjectExpression> moeList, string tableAlias)
  230. {
  231. DbSqlQueryExpression sqlQuery = this.CreateSqlQuery();
  232. DbSubQueryExpression subQuery = new DbSubQueryExpression(sqlQuery);
  233. string alias = tableAlias;
  234. DbTableSegment tableSeg = new DbTableSegment(subQuery, alias);
  235. DbTable table = new DbTable(tableSeg.Alias);
  236. IMappingObjectExpression newMoe = this.Result.MappingObjectExpression.ToNewObjectExpression(sqlQuery, table);
  237. List<IMappingObjectExpression> moes = new List<IMappingObjectExpression>(moeList.Count + 1);
  238. moes.AddRange(moeList);
  239. moes.Add(newMoe);
  240. DbExpression condition = GeneralExpressionVisitor.VisitPredicate(conditionExpression, moes);
  241. DbJoinTableExpression joinTable = new DbJoinTableExpression(joinType, tableSeg, condition);
  242. JoinQueryResult result = new JoinQueryResult();
  243. result.MappingObjectExpression = newMoe;
  244. result.JoinTable = joinTable;
  245. return result;
  246. }
  247. }
  248. }