Mercurial > pub > bltoolkit
view Source/Data/Linq/Builder/ScalarSelectBuilder.cs @ 9:1e85f66cf767 default tip
update bltoolkit
author | nickolay |
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date | Thu, 05 Apr 2018 20:53:26 +0300 |
parents | f990fcb411a9 |
children |
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using System; using System.Linq.Expressions; namespace BLToolkit.Data.Linq.Builder { using BLToolkit.Linq; using Data.Sql; class ScalarSelectBuilder : ISequenceBuilder { public int BuildCounter { get; set; } public bool CanBuild(ExpressionBuilder builder, BuildInfo buildInfo) { return buildInfo.Expression.NodeType == ExpressionType.Lambda && ((LambdaExpression)buildInfo.Expression).Parameters.Count == 0; } public IBuildContext BuildSequence(ExpressionBuilder builder, BuildInfo buildInfo) { return new ScalarSelectContext(builder) { Parent = buildInfo.Parent, Expression = buildInfo.Expression, SqlQuery = buildInfo.SqlQuery }; } public SequenceConvertInfo Convert(ExpressionBuilder builder, BuildInfo buildInfo, ParameterExpression param) { return null; } public bool IsSequence(ExpressionBuilder builder, BuildInfo buildInfo) { return true; } class ScalarSelectContext : IBuildContext { public ScalarSelectContext(ExpressionBuilder builder) { Builder = builder; builder.Contexts.Add(this); } #if DEBUG public string _sqlQueryText { get { return SqlQuery == null ? "" : SqlQuery.SqlText; } } #endif public ExpressionBuilder Builder { get; set; } public Expression Expression { get; set; } public SqlQuery SqlQuery { get; set; } public IBuildContext Parent { get; set; } public void BuildQuery<T>(Query<T> query, ParameterExpression queryParameter) { var expr = BuildExpression(null, 0); var mapper = Builder.BuildMapper<T>(expr); query.SetQuery(mapper.Compile()); } public Expression BuildExpression(Expression expression, int level) { if (expression == null) expression = ((LambdaExpression)Expression).Body.Unwrap(); switch (expression.NodeType) { case ExpressionType.New: case ExpressionType.MemberInit: { var expr = Builder.BuildExpression(this, expression); if (SqlQuery.Select.Columns.Count == 0) SqlQuery.Select.Expr(new SqlValue(1)); return expr; } default : { var expr = Builder.ConvertToSql(this, expression, false); var idx = SqlQuery.Select.Add(expr); return Builder.BuildSql(expression.Type, idx); } } } public SqlInfo[] ConvertToSql(Expression expression, int level, ConvertFlags flags) { throw new NotImplementedException(); } public SqlInfo[] ConvertToIndex(Expression expression, int level, ConvertFlags flags) { throw new NotImplementedException(); } public IsExpressionResult IsExpression(Expression expression, int level, RequestFor requestFlag) { switch (requestFlag) { case RequestFor.Expression : return IsExpressionResult.True; default : return IsExpressionResult.False; } } public IBuildContext GetContext(Expression expression, int level, BuildInfo buildInfo) { throw new NotImplementedException(); } public int ConvertToParentIndex(int index, IBuildContext context) { throw new NotImplementedException(); } public void SetAlias(string alias) { } public ISqlExpression GetSubQuery(IBuildContext context) { return null; } } } }