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1 using System;
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2 using System.Collections;
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3 using System.Collections.Generic;
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4 using System.Data;
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5 using System.Linq;
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6 using System.Linq.Expressions;
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7 using System.Reflection;
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8
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9 namespace BLToolkit.Data.Linq.Builder
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10 {
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11 using BLToolkit.Linq;
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12 using Reflection;
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13
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14 partial class ExpressionBuilder
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15 {
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16 #region BuildExpression
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17
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18 readonly HashSet<Expression> _skippedExpressions = new HashSet<Expression>();
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19
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20 public Expression BuildExpression(IBuildContext context, Expression expression)
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21 {
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22 var newExpr = expression.Convert2(expr =>
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23 {
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24 if (_skippedExpressions.Contains(expr))
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25 return new ExpressionHelper.ConvertInfo(expr, true);
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26
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27 if (expr.Find(IsNoneSqlMember) != null)
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28 return new ExpressionHelper.ConvertInfo(expr);
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29
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30 switch (expr.NodeType)
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31 {
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32 case ExpressionType.MemberAccess:
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33 {
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34 if (IsServerSideOnly(expr) || PreferServerSide(expr))
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35 return new ExpressionHelper.ConvertInfo(BuildSql(context, expr));
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36
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37 var ma = (MemberExpression)expr;
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38
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39 if (SqlProvider.ConvertMember(ma.Member) != null)
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40 break;
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41
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42 var ctx = GetContext(context, expr);
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43
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44 if (ctx != null)
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45 return new ExpressionHelper.ConvertInfo(ctx.BuildExpression(expr, 0));
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46
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47 var ex = ma.Expression;
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48
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49 if (ex != null && ex.NodeType == ExpressionType.Constant)
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50 {
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51 // field = localVariable
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52 //
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53 var c = _expressionAccessors[ex];
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54 return new ExpressionHelper.ConvertInfo(
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55 Expression.MakeMemberAccess(Expression.Convert(c, ex.Type), ma.Member));
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56 }
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57
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58 break;
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59 }
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60
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61 case ExpressionType.Parameter:
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62 {
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63 if (expr == ParametersParam)
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64 break;
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65
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66 var ctx = GetContext(context, expr);
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67
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68 if (ctx != null)
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69 return new ExpressionHelper.ConvertInfo(ctx.BuildExpression(expr, 0));
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70
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71 break;
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72 }
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73
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74 case ExpressionType.Constant:
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75 {
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76 if (ExpressionHelper.IsConstant(expr.Type))
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77 break;
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78
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79 if (_expressionAccessors.ContainsKey(expr))
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80 return new ExpressionHelper.ConvertInfo(Expression.Convert(_expressionAccessors[expr], expr.Type));
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81
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82 break;
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83 }
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84
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85 case ExpressionType.Coalesce:
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86
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87 if (expr.Type == typeof(string) && MappingSchema.GetDefaultNullValue<string>() != null)
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88 return new ExpressionHelper.ConvertInfo(BuildSql(context, expr));
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89
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90 if (CanBeTranslatedToSql(context, ConvertExpression(expr), true))
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91 return new ExpressionHelper.ConvertInfo(BuildSql(context, expr));
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92
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93 break;
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94
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95 case ExpressionType.Conditional:
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96
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97 if (CanBeTranslatedToSql(context, ConvertExpression(expr), true))
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98 return new ExpressionHelper.ConvertInfo(BuildSql(context, expr));
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99 break;
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100
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101 case ExpressionType.Call:
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102 {
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103 var ce = (MethodCallExpression)expr;
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104
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105 if (IsGroupJoinSource(context, ce))
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106 {
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107 foreach (var arg in ce.Arguments.Skip(1))
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108 if (!_skippedExpressions.Contains(arg))
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109 _skippedExpressions.Add(arg);
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110
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111 break;
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112 }
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113
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114 if (IsSubQuery(context, ce))
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115 {
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116 if (TypeHelper.IsSameOrParent(typeof(IEnumerable), expr.Type) && expr.Type != typeof(string) && !expr.Type.IsArray)
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117 return new ExpressionHelper.ConvertInfo(BuildMultipleQuery(context, expr));
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118
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119 return new ExpressionHelper.ConvertInfo(GetSubQuery(context, ce).BuildExpression(null, 0));
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120 }
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121
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122 if (IsServerSideOnly(expr) || PreferServerSide(expr))
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123 return new ExpressionHelper.ConvertInfo(BuildSql(context, expr));
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124 }
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125
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126 break;
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127 }
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128
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129 if (EnforceServerSide(context))
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130 {
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131 switch (expr.NodeType)
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132 {
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133 case ExpressionType.MemberInit :
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134 case ExpressionType.New :
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135 case ExpressionType.Convert :
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136 break;
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137
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138 default :
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139 if (CanBeCompiled(expr))
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140 break;
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141 return new ExpressionHelper.ConvertInfo(BuildSql(context, expr));
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142 }
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143 }
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144
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145 return new ExpressionHelper.ConvertInfo(expr);
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146 });
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147
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148 return newExpr;
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149 }
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150
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151 static bool EnforceServerSide(IBuildContext context)
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152 {
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153 return context.SqlQuery.Select.IsDistinct;
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154 }
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155
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156 #endregion
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157
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158 #region BuildSql
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159
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160 Expression BuildSql(IBuildContext context, Expression expression)
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161 {
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162 var sqlex = ConvertToSqlExpression(context, expression, true);
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163 var idx = context.SqlQuery.Select.Add(sqlex);
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164
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165 idx = context.ConvertToParentIndex(idx, context);
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166
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167 var field = BuildSql(expression.Type, idx);
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168
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169 return field;
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170 }
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171
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172 public Expression BuildSql(MemberAccessor ma, int idx, MethodInfo checkNullFunction, Expression context)
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173 {
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174 var expr = Expression.Call(DataReaderParam, ReflectionHelper.DataReader.GetValue, Expression.Constant(idx));
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175
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176 if (checkNullFunction != null)
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177 expr = Expression.Call(null, checkNullFunction, expr, context);
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178
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179 Expression mapper;
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180
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181 if (TypeHelper.IsEnumOrNullableEnum(ma.Type))
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182 {
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183 var type = TypeHelper.ToNullable(ma.Type);
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184 mapper =
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185 Expression.Convert(
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186 Expression.Call(
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187 Expression.Constant(MappingSchema),
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188 ReflectionHelper.MapSchema.MapValueToEnumWithMemberAccessor,
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189 expr,
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190 Expression.Constant(ma)),
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191 type);
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192 }
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193 else
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194 {
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195 MethodInfo mi;
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196
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197 if (!ReflectionHelper.MapSchema.Converters.TryGetValue(ma.Type, out mi))
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198 {
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199 mapper =
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200 Expression.Convert(
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201 Expression.Call(
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202 Expression.Constant(MappingSchema),
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203 ReflectionHelper.MapSchema.ChangeType,
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204 expr,
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205 Expression.Constant(ma.Type)),
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206 ma.Type);
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207 }
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208 else
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209 {
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210 mapper = Expression.Call(Expression.Constant(MappingSchema), mi, expr);
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211 }
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212 }
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213
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214 return mapper;
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215 }
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216
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217 public Expression BuildSql(Type type, int idx, MethodInfo checkNullFunction, Expression context)
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218 {
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219 var expr = Expression.Call(DataReaderParam, ReflectionHelper.DataReader.GetValue, Expression.Constant(idx));
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220
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221 if (checkNullFunction != null)
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222 expr = Expression.Call(null, checkNullFunction, expr, context);
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223
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224 Expression mapper;
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225
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226 if (type.IsEnum)
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227 {
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228 mapper =
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229 Expression.Convert(
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230 Expression.Call(
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231 Expression.Constant(MappingSchema),
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232 ReflectionHelper.MapSchema.MapValueToEnum,
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233 expr,
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234 Expression.Constant(type)),
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235 type);
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236 }
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237 else
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238 {
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239 MethodInfo mi;
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240
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241 if (!ReflectionHelper.MapSchema.Converters.TryGetValue(type, out mi))
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242 {
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243 mapper =
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244 Expression.Convert(
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245 Expression.Call(
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246 Expression.Constant(MappingSchema),
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247 ReflectionHelper.MapSchema.ChangeType,
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248 expr,
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249 Expression.Constant(type)),
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250 type);
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251 }
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252 else
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253 {
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254 mapper = Expression.Call(Expression.Constant(MappingSchema), mi, expr);
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255 }
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256 }
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257
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258 return mapper;
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259 }
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260
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261 public Expression BuildSql(Type type, int idx)
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262 {
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263 return BuildSql(type, idx, null, null);
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264 }
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265
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266 public Expression BuildSql(MemberAccessor ma, int idx)
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267 {
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268 return BuildSql(ma, idx, null, null);
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269 }
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270
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271 #endregion
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272
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273 #region IsNonSqlMember
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274
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275 bool IsNoneSqlMember(Expression expr)
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276 {
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277 switch (expr.NodeType)
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278 {
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279 case ExpressionType.MemberAccess:
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280 {
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281 var me = (MemberExpression)expr;
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282
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283 var om = (
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284 from c in Contexts.OfType<TableBuilder.TableContext>()
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285 where c.ObjectType == me.Member.DeclaringType
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286 select c.ObjectMapper
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287 ).FirstOrDefault();
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288
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289 return om != null && om.Associations.All(a => !TypeHelper.Equals(a.MemberAccessor.MemberInfo, me.Member)) && om[me.Member.Name, true] == null;
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290 }
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291 }
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292
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293 return false;
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294 }
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295
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296 #endregion
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297
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298 #region PreferServerSide
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299
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300 bool PreferServerSide(Expression expr)
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301 {
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302 switch (expr.NodeType)
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303 {
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304 case ExpressionType.MemberAccess:
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305 {
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306 var pi = (MemberExpression)expr;
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307 var l = SqlProvider.ConvertMember(pi.Member);
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308
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309 if (l != null)
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310 {
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311 var info = l.Body.Unwrap();
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312
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313 if (l.Parameters.Count == 1 && pi.Expression != null)
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314 info = info.Convert(wpi => wpi == l.Parameters[0] ? pi.Expression : wpi);
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315
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316 return info.Find(PreferServerSide) != null;
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317 }
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318
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319 var attr = GetFunctionAttribute(pi.Member);
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320 return attr != null && attr.PreferServerSide && !CanBeCompiled(expr);
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321 }
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322
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323 case ExpressionType.Call:
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324 {
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325 var pi = (MethodCallExpression)expr;
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326 var e = pi;
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327 var l = SqlProvider.ConvertMember(e.Method);
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328
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329 if (l != null)
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330 return l.Body.Unwrap().Find(PreferServerSide) != null;
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331
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332 var attr = GetFunctionAttribute(e.Method);
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333 return attr != null && attr.PreferServerSide && !CanBeCompiled(expr);
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334 }
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335 }
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336
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337 return false;
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338 }
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339
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340 #endregion
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341
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342 #region Build Mapper
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343
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344 public Expression BuildBlock(Expression expression)
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345 {
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346 #if FW4 || SILVERLIGHT
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347
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348 if (IsBlockDisable || BlockExpressions.Count == 0)
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349 return expression;
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350
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351 BlockExpressions.Add(expression);
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352
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353 expression = Expression.Block(BlockVariables, BlockExpressions);
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354
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355 BlockVariables. Clear();
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356 BlockExpressions.Clear();
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357
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358 #endif
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359
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360 return expression;
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361 }
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362
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363 public Expression<Func<QueryContext,IDataContext,IDataReader,Expression,object[],T>> BuildMapper<T>(Expression expr)
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364 {
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365 var type = typeof(T);
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366
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367 if (expr.Type != type)
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368 expr = Expression.Convert(expr, type);
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369
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370 var mapper = Expression.Lambda<Func<QueryContext,IDataContext,IDataReader,Expression,object[],T>>(
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371 BuildBlock(expr), new []
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372 {
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373 ContextParam,
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374 DataContextParam,
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375 DataReaderParam,
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376 ExpressionParam,
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377 ParametersParam,
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378 });
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379
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380 return mapper;
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381 }
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382
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383 #endregion
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384
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385 #region BuildMultipleQuery
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386
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387 interface IMultipleQueryHelper
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388 {
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389 Expression GetSubquery(
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390 ExpressionBuilder builder,
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391 Expression expression,
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392 ParameterExpression paramArray,
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393 IEnumerable<Expression> parameters);
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394 }
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395
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396 class MultipleQueryHelper<TRet> : IMultipleQueryHelper
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397 {
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398 public Expression GetSubquery(
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399 ExpressionBuilder builder,
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400 Expression expression,
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401 ParameterExpression paramArray,
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402 IEnumerable<Expression> parameters)
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403 {
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404 var lambda = Expression.Lambda<Func<IDataContext,object[],TRet>>(
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405 expression,
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406 Expression.Parameter(typeof(IDataContext), "ctx"),
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407 paramArray);
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408 var queryReader = CompiledQuery.Compile(lambda);
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409
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410 return Expression.Call(
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411 null,
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412 ReflectionHelper.Expressor<object>.MethodExpressor(_ => ExecuteSubQuery(null, null, null)),
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413 ContextParam,
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414 Expression.NewArrayInit(typeof(object), parameters),
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415 Expression.Constant(queryReader)
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416 );
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417 }
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418
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419 static TRet ExecuteSubQuery(
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420 QueryContext queryContext,
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421 object[] parameters,
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422 Func<IDataContext,object[],TRet> queryReader)
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423 {
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424 var db = queryContext.GetDataContext();
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425
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426 try
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427 {
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428 return queryReader(db.DataContextInfo.DataContext, parameters);
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429 }
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430 finally
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431 {
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432 queryContext.ReleaseDataContext(db);
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433 }
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434 }
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435 }
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436
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437 public Expression BuildMultipleQuery(IBuildContext context, Expression expression)
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438 {
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439 if (!Common.Configuration.Linq.AllowMultipleQuery)
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440 throw new LinqException("Multiple queries are not allowed. Set the 'BLToolkit.Common.Configuration.Linq.AllowMultipleQuery' flag to 'true' to allow multiple queries.");
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441
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442 var parameters = new HashSet<ParameterExpression>();
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443
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444 expression.Visit(e =>
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445 {
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446 if (e.NodeType == ExpressionType.Lambda)
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447 foreach (var p in ((LambdaExpression)e).Parameters)
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448 parameters.Add(p);
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449 });
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450
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451 // Convert associations.
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452 //
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453 expression = expression.Convert(e =>
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454 {
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455 switch (e.NodeType)
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456 {
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457 case ExpressionType.MemberAccess :
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458 {
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459 var root = e.GetRootObject();
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460
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461 if (root != null &&
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462 root.NodeType == ExpressionType.Parameter &&
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463 !parameters.Contains((ParameterExpression)root))
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464 {
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465 var res = context.IsExpression(e, 0, RequestFor.Association);
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466
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467 if (res.Result)
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468 {
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469 var table = (TableBuilder.AssociatedTableContext)res.Context;
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470
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|
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471 if (table.IsList)
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472 {
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473 var ttype = typeof(Table<>).MakeGenericType(table.ObjectType);
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|
474 var tbl = Activator.CreateInstance(ttype);
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|
|
475 var method = typeof(LinqExtensions)
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|
|
476 .GetMethod("Where", BindingFlags.NonPublic | BindingFlags.Static)
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|
|
477 .MakeGenericMethod(e.Type, table.ObjectType, ttype);
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|
|
478
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|
|
479 var me = (MemberExpression)e;
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|
|
480 var op = Expression.Parameter(table.ObjectType, "t");
|
|
|
481
|
|
|
482 parameters.Add(op);
|
|
|
483
|
|
|
484 Expression ex = null;
|
|
|
485
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|
|
486 for (var i = 0; i < table.Association.ThisKey.Length; i++)
|
|
|
487 {
|
|
|
488 var field1 = table.ParentAssociation.SqlTable.Fields[table.Association.ThisKey [i]];
|
|
|
489 var field2 = table. SqlTable.Fields[table.Association.OtherKey[i]];
|
|
|
490
|
|
|
491 var ee = Expression.Equal(
|
|
|
492 Expression.MakeMemberAccess(op, field2.MemberMapper.MemberAccessor.MemberInfo),
|
|
|
493 Expression.MakeMemberAccess(me.Expression, field1.MemberMapper.MemberAccessor.MemberInfo));
|
|
|
494
|
|
|
495 ex = ex == null ? ee : Expression.AndAlso(ex, ee);
|
|
|
496 }
|
|
|
497
|
|
|
498 return Expression.Call(null, method, Expression.Constant(tbl), Expression.Lambda(ex, op));
|
|
|
499 }
|
|
|
500 }
|
|
|
501 }
|
|
|
502
|
|
|
503 break;
|
|
|
504 }
|
|
|
505 }
|
|
|
506
|
|
|
507 return e;
|
|
|
508 });
|
|
|
509
|
|
|
510 var paramex = Expression.Parameter(typeof(object[]), "ps");
|
|
|
511 var parms = new List<Expression>();
|
|
|
512
|
|
|
513 // Convert parameters.
|
|
|
514 //
|
|
|
515 expression = expression.Convert(e =>
|
|
|
516 {
|
|
|
517 var root = e.GetRootObject();
|
|
|
518
|
|
|
519 if (root != null &&
|
|
|
520 root.NodeType == ExpressionType.Parameter &&
|
|
|
521 !parameters.Contains((ParameterExpression)root))
|
|
|
522 {
|
|
|
523 var ex = Expression.Convert(BuildExpression(context, e), typeof(object));
|
|
|
524
|
|
|
525 parms.Add(ex);
|
|
|
526
|
|
|
527 return Expression.Convert(
|
|
|
528 Expression.ArrayIndex(paramex, Expression.Constant(parms.Count - 1)),
|
|
|
529 e.Type);
|
|
|
530 }
|
|
|
531
|
|
|
532 return e;
|
|
|
533 });
|
|
|
534
|
|
|
535 var sqtype = typeof(MultipleQueryHelper<>).MakeGenericType(expression.Type);
|
|
|
536 var helper = (IMultipleQueryHelper)Activator.CreateInstance(sqtype);
|
|
|
537
|
|
|
538 return helper.GetSubquery(this, expression, paramex, parms);
|
|
|
539 }
|
|
|
540
|
|
|
541 #endregion
|
|
|
542 }
|
|
|
543 }
|
