在预期条件的上下文中指定的非布尔类型表达式，靠近“AdmissionID”

Question

“/”应用程序中的服务器错误。

在“AdmissionID”附近的预期条件的上下文中指定的非布尔类型表达式。

说明：

在执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详情：

System.Data.SqlClient.SqlException：在“AdmissionID”附近的预期条件的上下文中指定的非布尔类型表达式。

来源错误：

在执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常来源和位置的信息。

堆栈跟踪：

[SqlException (0x80131904): An expression of non-boolean type specified in a context where a condition is expected, near 'AdmissionID'.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +1767866
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5352418
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +244
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +1691
   System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +61
   System.Data.SqlClient.SqlDataReader.get_MetaData() +90
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +365
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) +1406
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +177
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +53
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +134
   System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41
   System.Data.Common.DbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) +10
   System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +140
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +316
   System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +86
   System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1481
   System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +101
   System.Web.UI.WebControls.ListControl.PerformSelect() +34
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +30
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +105
   System.Web.UI.WebControls.BaseDataBoundControl.set_RequiresDataBinding(Boolean value) +9844021
   System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewChanged(Object sender, EventArgs e) +15
   System.Web.UI.DataSourceView.OnDataSourceViewChanged(EventArgs e) +105
   System.Web.UI.WebControls.SqlDataSourceView.SelectParametersChangedEventHandler(Object o, EventArgs e) +31
   System.Web.UI.WebControls.ParameterCollection.OnParametersChanged(EventArgs e) +20
   System.Web.UI.WebControls.Parameter.UpdateValue(HttpContext context, Control control) +142
   System.Web.UI.WebControls.ParameterCollection.UpdateValues(HttpContext context, Control control) +101
   System.Web.UI.WebControls.ParameterCollection.GetValues(HttpContext context, Control control) +36
   System.Web.UI.WebControls.SqlDataSourceView.InitializeParameters(DbCommand command, ParameterCollection parameters, IDictionary exclusionList) +257
   System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +589
   System.Web.UI.WebControls.ListControl.OnDataBinding(EventArgs e) +101
   System.Web.UI.WebControls.ListControl.PerformSelect() +34
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +30
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +105
   System.Web.UI.WebControls.ListControl.OnPreRender(EventArgs e) +23
   System.Web.UI.Control.PreRenderRecursiveInternal() +83
   System.Web.UI.Control.PreRenderRecursiveInternal() +155
   System.Web.UI.Control.PreRenderRecursiveInternal() +155
   System.Web.UI.Control.PreRenderRecursiveInternal() +155
   System.Web.UI.Control.PreRenderRecursiveInternal() +155
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +974

我的SQL命令是这样的>>SELECT * FROM [Bed] WHERE WardID = @WardID AND BedStatus = 'Available' AND BedNo NOT IN (SELECT BedNo FROM [AdmissionDetail], [Admission] WHERE ([AdmissionDate] <= @AdmissionDate AND [DischargeDate] >= @DischargeDate AND AdmissionStatus <> 'Discharged' AND [AdmissionDetail]AdmissionID = [Admission]AdmissionID))

我正在使用 Visual Studio 2013 并使用 asp:DropDownList 和 asp:SqlDataSource 来执行此操作。 我有 4 张桌子，分别是 Admission、AdmissionDetail、Ward 和 Bed。

Answer 1

table alias 和 column name 之间的 where 子句中缺少 dot

..[AdmissionDetail].AdmissionID = [Admission].AdmissionID

同时记下几点。

始终使用正确的INNER JOIN 连接两个表，而不是旧式的逗号分隔连接，并在where 子句中单独保留 过滤器

而不是Not In 子句Not exists 可以提高性能，当sub-query 返回任何NULL 值时NOT IN 将失败

SELECT *
FROM   [Bed] b
WHERE  WardID = @WardID
       AND BedStatus = 'Available'
       AND NOT EXISTS (SELECT 1
                       FROM   [AdmissionDetail]
                              INNER JOIN [Admission]
                                      ON [AdmissionDetail].AdmissionID = [Admission].AdmissionID
                       WHERE  b.bedno = BedNo
                              AND [AdmissionDate] <= @AdmissionDate
                              AND [DischargeDate] >= @DischargeDate
                              AND AdmissionStatus <> 'Discharged')