最新要闻

广告

手机

iphone11大小尺寸是多少？苹果iPhone11和iPhone13的区别是什么？

iphone11大小尺寸是多少？苹果iPhone11和iPhone13的区别是什么？

 警方通报辅警执法直播中被撞飞：犯罪嫌疑人已投案

警方通报辅警执法直播中被撞飞：犯罪嫌疑人已投案

家电

  1. 首页
  2. 移动通信
  3. 内容

Geotools基本增删改查Feature-天天精选

来源：博客园


(资料图片)

postgis依赖

    org.geotools    gt-main    27.2    org.geotools    gt-jdbc-postgis    27.2

创建连接JDBCDataStore

Map params = Map.of(    PostgisNGDataStoreFactory.HOST.key, host,    PostgisNGDataStoreFactory.PORT.key, port,    PostgisNGDataStoreFactory.DATABASE.key, database,    PostgisNGDataStoreFactory.SCHEMA.key, schema,    PostgisNGDataStoreFactory.USER.key, user,    PostgisNGDataStoreFactory.PASSWD.key, passwd,    PostgisNGDataStoreFactory.DBTYPE.key, dbtype);JDBCDataStore jdbcDataStore = (JDBCDataStore)DataStoreFinder.getDataStore(params);

JDBCDataStore连接参数

ParameterDescription
dbtypeMust be the string postgis
hostMachine name or IP address to connect to
portPort number to connect to, default 5432
schemaThe database schema to access
databaseThe database to connect to
userUser name
passwdPassword
loose bboxFlag controlling loose bbox comparisons, default is true
preparedStatementsFlag controlling whether prepared statements are used, default is false
encode functionsFlag controlling if some common functions can be encoded into their SQL equivalent

连接池参数

ParameterDescription
max connectionsMaximum number of connection the pool will hold at any time, default is 10
min connectionsMinimum number of connection the pool will hold at any time, default is 1
connection timeoutMaximum number of second the pool will wait when trying to obtain a connection, default is 20 seconds
validate connectionsFlag controlling if the pool should validate connections when a new connection is obtained
Max open prepared statementsMaximum number of prepared statements kept open and cached for each connection in the pool. Set to 0 to have unbounded caching, -1 to disable
Test while idlePeriodically test if the connections are still valid also while idle in the pool
Time between evictor runsNumber of seconds between idle object evictor runs. The default value is 300 seconds.
Min evictable timeNumber of seconds a connection needs to stay idle before the evictor starts to consider closing it
Evictor tests per runNumber of connections checked by the idle connection evictor for each of its runs. The default value is 3 connections.

过滤器-Filter

使用过滤器来定义要对其进行操作的Feature集合。过滤器也可以组合成一个操作集合使用。简单说，过滤器相当于SQL语句的WHERE子句中存在的信息。Filter有多个子类，实现了许多类型的过滤器，包括简单的属性比较和空间查询。

// 普通字段FilterFactory ff = CommonFactoryFinder.getFilterFactory();/** * field 字段名 * value 条件值 * geometry 条件几何体 *  *  * matchCase 是否区分大小写，默认true-区分 * MatchAction(实现MultiValuedFilter的会有)，匹配逻辑 * MatchAction.ANY-任何一个满足，默认值 * MatchAction.ALL-全部满足 * MatchAction.ONE-只有一个满足 * */PropertyIsEqualTo equal = ff.equal(ff.property(field), ff.literal(value), true);//等于PropertyIsLike like = ff.like(ff.property(field), "%keywords%");//模糊匹配PropertyIsNotEqualTo notEqualTo = ff.notEqual(ff.property(field), ff.literal(value));//不等于PropertyIsNull aNull = ff.isNull(ff.property(field));//nullPropertyIsGreaterThan greater = ff.greater(ff.property(field), ff.literal(value));// 大于PropertyIsGreaterThanOrEqualTo greaterOrEqual = ff.greaterOrEqual(ff.property(field), ff.literal(value));// 大于等于PropertyIsLessThan less = ff.less(ff.property(field), ff.literal(value));//小于PropertyIsLessThanOrEqualTo lessOrEqual = ff.lessOrEqual(ff.property(field), ff.literal(value));//小于等于PropertyIsBetween between = ff.between(ff.property(field), ff.literal(value), ff.literal(value));//在...之间During during = ff.during(ff.property(field), ff.literal(value));//在时间期间Before before = ff.before(ff.property(field), ff.literal(value));//在时间之前After after = ff.after(ff.property(field), ff.literal(value));//在时间之后// Geometry字段FilterFactory2 ff2 = CommonFactoryFinder.getFilterFactory2();Beyond beyond = ff2.beyond(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry), 100.0, Units.METRE.name);// 图层几何字段超出给定几何100米距离的Contains contains = ff2.contains(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段包含给定几何Within within = ff2.within(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段被给定几何包含Intersects intersects = ff2.intersects(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段与给定几何相交Disjoint disjoint = ff2.disjoint(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段与给定几何不相交Touches touches = ff2.touches(ff2.property(featureSource.schema.geometryDescriptor.localName), ff2.literal(geometry));// 图层几何字段与给定几何相切// filter集合的逻辑关系，and并，or或，not非And and = ff.and(List.of(equal,like,beyond));//Or or = ff.or(List.of(notEqualTo,greater,contains));Not not = ff.not(during);// Function的实现类具体实现函数，name-函数名，例如：min,strReplace,toWKTFunction function = ff.function(name,expr1,exprN);PropertyName property = ff.property(field);Literal v = ff.literal(value);Function min = ff.function("min", property, v);PropertyName property = ff.property(field);Literal search = ff.literal("search");Literal replace = ff.literal("replace");Literal all = ff.literal( true );Function replace = ff.function("strReplace", new Expression[]{property,search,replace,all});PropertyName property = ff.property(featureSource.schema.geometryDescriptor.localName);Function toWKT = ff.function("toWKT", property);

查询

/** * tableName 表名 * filter 过滤器 * List propNames 字段名列表 *  * startIndex 起始位 * maxFeatures 最大条数 * sortField 排序字段名 * */ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);//返回字段列List propertyNames = propNames.stream().map(ff::property).collect(Collectors.toList());Query query = new Query(tableName,filter,propertyNames)；int count = featureSource.getCount(query)；//计数// 分页，倒序query.setStartIndex(startIndex);query.setMaxFeatures(maxFeatures);query.setSortBy(new SortByImpl(ff.property(sortField), SortOrder.DESCENDING));ContentFeatureCollection collection = featureSource.getFeatures(query);SimpleFeatureIterator iterator = collection.features();// SimpleFeatureIterator必须关闭，否则会造成内存泄漏iterator.close();

新增

/*** tableName 图层名* fieldName1 字段名* fieldValue1 字段值**/ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);SimpleFeatureStore store = (SimpleFeatureStore)featureSource;  // write access!SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(store.getSchema());featureBuilder.set(fieldName1,fieldValue1);featureBuilder.set(fieldNameN,fieldValueN);SimpleFeature feature = featureBuilder.buildFeature(null);ListFeatureCollection featureCollection = new ListFeatureCollection(store.getSchema(), List.of(feature));List addFeatures = store.addFeatures(featureCollection);

删除

/**** typeName 图层名* fliter 过滤条件**/ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);SimpleFeatureStore store = (SimpleFeatureStore)featureSource;  // write access!store.removeFeatures(filter);

修改

/*** * typeName 图层名* names 修改字段名数组* values 修改值数组* fliter 过滤条件* names和values顺序保持一致*/ContentFeatureSource featureSource = (ContentFeatureSource) jdbcDataStore.getFeatureSource(tableName);SimpleFeatureStore store = (SimpleFeatureStore)featureSource;  // write access!store.modifyFeature(names, values, filter)

关键词：