java arcgis属性查询
时间: 2023-11-18 19:03:49 浏览: 39
属性查询是从ArcGIS中检索和查找数据的一种方法。可以使用Java编程语言中的ArcObjects API来执行属性查询。以下是一个简单的示例,演示如何使用Java API执行属性查询:
1. 首先,需要使用ArcGIS Java API连接到目标地理数据库或文件地理数据库:
```java
// Connect to the geodatabase
String gdbPath = "C:/data/mygeodatabase.gdb";
WorkspaceFactory workspaceFactory = new FileGDBWorkspaceFactory();
IWorkspace workspace = workspaceFactory.openFromFile(gdbPath, 0);
```
2. 接下来,需要获取要查询的要素类的属性表:
```java
// Get the feature class to query
IFeatureWorkspace featureWorkspace = (IFeatureWorkspace) workspace;
IFeatureClass featureClass = featureWorkspace.openFeatureClass("MyFeatureClass");
ITable table = (ITable) featureClass;
```
3. 然后,需要构造一个查询过滤器来指定要查询的属性。例如,以下代码将返回所有名称字段包含“ABC”的要素:
```java
// Construct the query filter
IQueryFilter queryFilter = new QueryFilter();
queryFilter.setWhereClause("NAME like '%ABC%'");
// Execute the query and loop through the results
ICursor cursor = table.search(queryFilter, true);
IFeature feature = null;
while ((feature = (IFeature) cursor.nextRow()) != null) {
// Do something with the feature
}
```
以上示例仅介绍了如何执行简单的属性查询。更复杂的查询可能需要使用更高级的过滤器、子查询和空间查询等技术。