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1 using System;
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2 using System.Linq.Expressions;
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3
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4 namespace BLToolkit.Data.Linq.Builder
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5 {
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6 using BLToolkit.Linq;
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7 using Data.Sql;
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8
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9 class ScalarSelectBuilder : ISequenceBuilder
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10 {
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11 public int BuildCounter { get; set; }
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12
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13 public bool CanBuild(ExpressionBuilder builder, BuildInfo buildInfo)
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14 {
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15 return
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16 buildInfo.Expression.NodeType == ExpressionType.Lambda &&
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17 ((LambdaExpression)buildInfo.Expression).Parameters.Count == 0;
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18 }
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19
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20 public IBuildContext BuildSequence(ExpressionBuilder builder, BuildInfo buildInfo)
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21 {
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22 return new ScalarSelectContext(builder)
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23 {
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24 Parent = buildInfo.Parent,
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25 Expression = buildInfo.Expression,
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26 SqlQuery = buildInfo.SqlQuery
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27 };
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28 }
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29
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30 public SequenceConvertInfo Convert(ExpressionBuilder builder, BuildInfo buildInfo, ParameterExpression param)
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31 {
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32 return null;
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33 }
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34
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35 public bool IsSequence(ExpressionBuilder builder, BuildInfo buildInfo)
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36 {
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37 return true;
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38 }
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39
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40 class ScalarSelectContext : IBuildContext
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41 {
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42 public ScalarSelectContext(ExpressionBuilder builder)
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43 {
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44 Builder = builder;
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45
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46 builder.Contexts.Add(this);
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47 }
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48
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49 #if DEBUG
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50 public string _sqlQueryText { get { return SqlQuery == null ? "" : SqlQuery.SqlText; } }
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51 #endif
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52
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53 public ExpressionBuilder Builder { get; set; }
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54 public Expression Expression { get; set; }
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55 public SqlQuery SqlQuery { get; set; }
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56 public IBuildContext Parent { get; set; }
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57
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58 public void BuildQuery<T>(Query<T> query, ParameterExpression queryParameter)
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59 {
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60 var expr = BuildExpression(null, 0);
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61 var mapper = Builder.BuildMapper<T>(expr);
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62
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63 query.SetQuery(mapper.Compile());
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64 }
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65
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66 public Expression BuildExpression(Expression expression, int level)
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67 {
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68 if (expression == null)
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69 expression = ((LambdaExpression)Expression).Body.Unwrap();
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70
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71 switch (expression.NodeType)
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72 {
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73 case ExpressionType.New:
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74 case ExpressionType.MemberInit:
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75 {
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76 var expr = Builder.BuildExpression(this, expression);
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77
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78 if (SqlQuery.Select.Columns.Count == 0)
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79 SqlQuery.Select.Expr(new SqlValue(1));
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80
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81 return expr;
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82 }
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83
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84 default :
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85 {
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86 var expr = Builder.ConvertToSql(this, expression, false);
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87 var idx = SqlQuery.Select.Add(expr);
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88
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89 return Builder.BuildSql(expression.Type, idx);
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90 }
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91 }
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92
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93 }
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94
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95 public SqlInfo[] ConvertToSql(Expression expression, int level, ConvertFlags flags)
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96 {
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97 throw new NotImplementedException();
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98 }
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99
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100 public SqlInfo[] ConvertToIndex(Expression expression, int level, ConvertFlags flags)
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101 {
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102 throw new NotImplementedException();
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103 }
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104
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105 public IsExpressionResult IsExpression(Expression expression, int level, RequestFor requestFlag)
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106 {
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107 switch (requestFlag)
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108 {
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109 case RequestFor.Expression : return IsExpressionResult.True;
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110 default : return IsExpressionResult.False;
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111 }
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112 }
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113
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114 public IBuildContext GetContext(Expression expression, int level, BuildInfo buildInfo)
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115 {
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116 throw new NotImplementedException();
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117 }
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118
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119 public int ConvertToParentIndex(int index, IBuildContext context)
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120 {
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121 throw new NotImplementedException();
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122 }
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123
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124 public void SetAlias(string alias)
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125 {
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126 }
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127
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128 public ISqlExpression GetSubQuery(IBuildContext context)
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129 {
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130 return null;
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131 }
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132 }
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133 }
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134 }
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