/// <summary>
/// 获取表达式的执行计划。
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public Expression GetExecutionPlan(Expression expression)
{
try
{
if (expression is LambdaExpression lambda)
{
expression = lambda.Body;
}
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var trans = service.InitializeContext.Provider.GetTranslateProvider();
var options = GetTranslateOptions();
using (var scope = new TranslateScope(service, trans, options))
{
var translation = trans.Translate(expression);
var translator = trans.CreateTranslator();
return(ExecutionBuilder.Build(translation, e => translator.Translate(e)));
}
}
catch (Exception ex)
{
throw new TranslateException(expression, ex);
}
}
/// <summary>
/// 获取表达式的执行计划。
/// </summary>
/// <param name="expression"></param>
/// <param name="option"></param>
/// <returns></returns>
public Expression GetExecutionPlan(Expression expression, TranslateOptions option = null)
{
try
{
LambdaExpression lambda = expression as LambdaExpression;
if (lambda != null)
{
expression = lambda.Body;
}
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var package = GetTranslateProvider();
var options = option ?? (section != null ? section.Options : TranslateOptions.Default);
using (var scope = new TranslateScope(context, package))
{
var translation = package.Translate(expression, options);
return(package.BuildExecutionPlan(translation, options));
}
}
catch (Exception ex)
{
throw new TranslateException(expression, ex);
}
}
public Expression GetExecutionPlan(Expression expression, TranslateOptions option = null)
{
try
{
LambdaExpression lambda = expression as LambdaExpression;
if (lambda != null)
{
expression = lambda.Body;
}
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var package = GetTranslateProvider();
var options = option ?? (section == null ? package.CreateOptions() : section.Options);
using (var scope = new TranslateScope(context, package))
{
var translation = package.Translate(expression, options);
var parameters = lambda != null ? lambda.Parameters : null;
var provider = Find(expression, parameters, typeof(QueryProvider));
if (provider == null)
{
var rootQueryable = Find(expression, parameters, typeof(IQueryable));
provider = Expression.Property(rootQueryable, typeof(IQueryable).GetProperty("Provider"));
}
return(package.BuildExecutionPlan(translation, provider, options));
}
}
catch (Exception ex)
{
throw new TranslateException(expression, ex);
}
}
/// <summary>
/// 执行表达式的翻译。
/// </summary>
/// <param name="expression">表示 LINQ 查询的表达式树。</param>
/// <returns>一个 <see cref="TranslateResult"/>。</returns>
/// <param name="option">指定解析的选项。</param>
/// <exception cref="TranslateException">对 LINQ 表达式解析失败时抛出此异常。</exception>
public TranslateResult Translate(Expression expression, TranslateOptions option = null)
{
try
{
LambdaExpression lambda = expression as LambdaExpression;
if (lambda != null)
{
expression = lambda.Body;
}
var section = ConfigurationUnity.GetSection <TranslatorConfigurationSection>();
var package = GetTranslateProvider();
var options = option ?? (section == null ? package.CreateOptions() : section.Options);
using (var scope = new TranslateScope(context, package))
{
var translation = package.Translate(expression, options);
var translator = package.CreateTranslator();
translator.InternalContext = context;
translator.Environment = environment;
translator.Options = options;
TranslateResult result;
var selects = SelectGatherer.Gather(translation).ToList();
if (selects.Count > 0)
{
result = translator.Translate(selects[0]);
if (selects.Count > 1)
{
var list = new List <TranslateResult>();
for (var i = 1; i < selects.Count; i++)
{
list.Add(translator.Translate((selects[i])));
}
result.NestedResults = list.AsReadOnly();
}
}
else
{
translator.Options.HideTableAliases = translator.Options.HideColumnAliases = true;
result = translator.Translate(expression);
}
return(result);
}
}
catch (Exception ex)
{
throw new TranslateException(expression, ex);
}
}
/// <summary>
/// 执行表达式的翻译。
/// </summary>
/// <param name="expression">表示 LINQ 查询的表达式树。</param>
/// <returns>一个 <see cref="TranslateResult"/>。</returns>
/// <param name="options">指定解析的选项。</param>
/// <exception cref="TranslateException">对 LINQ 表达式解析失败时抛出此异常。</exception>
public TranslateResult Translate(Expression expression, TranslateOptions options = null)
{
try
{
if (expression is LambdaExpression lambda)
{
expression = lambda.Body;
}
var trans = service.InitializeContext.Provider.GetTranslateProvider();
options = options ?? GetTranslateOptions();
using (var scope = new TranslateScope(service, trans, options))
{
var translation = trans.Translate(expression);
var translator = trans.CreateTranslator();
TranslateResult result;
var selects = SelectGatherer.Gather(translation).ToList();
if (selects.Count > 0)
{
result = translator.Translate(selects[0]);
if (selects.Count > 1)
{
var list = new List <TranslateResult>();
for (var i = 1; i < selects.Count; i++)
{
list.Add(translator.Translate((selects[i])));
}
result.NestedResults = list.AsReadOnly();
}
}
else
{
result = translator.Translate(expression);
}
return(result);
}
}
catch (Exception ex)
{
throw new TranslateException(expression, ex);
}
}
