在ArcGIS中，查询表达式是一种用于查询和筛选数据的强大工具。它基于SQL（Structured Query Language，结构化查询语言）的语法，主要用于从空间数据中提取所需的要素或记录。ArcGIS支持的查询表达式语法包括基本的SQL语法和一些特定于ArcGIS的功能。下面将详细介绍这些查询表达式的主要特点和用法。1.基本SQL查询
/Users/stephen/ArcGIS/AppStudio/Apps/SqlQuery/MyApp.qml:7:1: QML SqlDatabase: SQL Error:1:Unable to execute statement:no such table: bar // ArcGIS.AppFramework.Player: Object: QObject(0x0) Text: "file:///C:/Users/stephen/ArcGIS/AppStudio/Apps/SqlQuery/MyApp.qml:12: Error: Error 1...
ArcGIS Desktop の今後のリリース予定はないため、ArcGIS Pro に移行することをお勧めします。 詳細については、「ArcMap から ArcGIS Pro への移行」をご参照ください。例 バージョン対応登録されていないテーブルを操作するときに、ジオプロセシング ツールを使用するよりも、SQL (Structured ...
詳細については、「ArcMap から ArcGIS Pro への移行」をご参照ください。Production Mapping ライセンスで利用できます。 To create calculated representation rules, you define a set of features to symbolize. To create calculated field rules, you define a set of features to which you are going...
SqlQueryModel SqlScalarFunction SqlTable SqlTableModel ArcGIS.AppFramework.WebView BrowserView WebView WebViewLoadRequest ArcGIS.AppFramework.Sql 1.0 Coordinate Tools to convert and parse GPS coordinates ST Spatial Type singleton Sql Contains miscellaneous Sql utilities SqlAbstractFunction Provides tools for ...
A SQL expression contains a combination of one or more values, operators, and SQL functions that can be used to query or select a subset of features and table records in ArcGIS. All SQL queries are expressed using the keywordSELECT.
You can apply a SQL query to limit the features in a layer that will be labeled. You can view a demonstration of this functionalityh below or simply read on. To set a SQL query on a layer to limit the features that will be labeled, select the layer to be labeled from the ArcGIS Pr...
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GetInvalidCharactersreturns aStringthat contains all the invalid characters for theWorkspaceobject used as the query interface forISQLSyntax. Product Availability Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server. Supported Platforms
boolean isVip = userIds. CONTAINS (userId); 1. 2. 正例: LONG userId = sqlMap.queryObject ("select userId from user where userId='userId' and isVip='1' ") boolean isVip = userId ! = NULL; 1. 2. 理由: 需要什么数据,就去查什么数据,避免返回不必要的数据,节省开销。