ArcSDE SDK Java 快速实践 5
I. 数据操作
· 添加
添加数据操作封装在SeInsert类中，如下的代码展示了如何在一个名为“PT”的点图层中添加数据：
SeConnection conn = getConn();
if (conn != null) {
try {
SeInsert insert = new SeInsert(conn);
insert.intoTable("PT", new String[] { "SHAPE", "NAME" });
insert.setWriteMode(true);// 开启buffer
SeLayer layer = new SeLayer(conn, "PT", "SHAPE");
SeCoordinateReference cr = layer.getCoordRef();
for (int i = 0; i < 10; i++) {
SeRow row = insert.getRowToSet();
SeShape shape = new SeShape(cr);
String wkt = "POINT("+i+" " + i+")";
shape.generateFromText(wkt);
row.setShape(0, shape);
row.setNString(1, "名称" + i);
insert.execute();
}
insert.flushBufferedWrites();
insert.close();
} catch (SeException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SeException e) {
e.printStackTrace();
}
}
}
· 查询
查询数据操作封装在SeQuery类中，如下的代码展示了如何在一个名为“PT”的点图层中查询数据，其中包括属性和空间过滤条件：
SeConnection conn = getConn();
if (conn != null) {
try {
SeLayer layer = new SeLayer(conn, "PT", "SHAPE");
SeCoordinateReference cr = layer.getCoordRef();
SeShape inputShape = new SeShape(cr);
inputShape.generateFromText("POLYGON((2 2,2 4,4 4,4 2,2 2))");
SeSqlConstruct sqlC = new SeSqlConstruct("PT");
sqlC.setWhere("OBJECTID>4");
String[] cols = new String[] { "OBJECTID", "SHAPE","NAME" };
SeQuery query = new SeQuery(conn, cols, sqlC);
query.prepareQuery();
SeFilter filter = new SeShapeFilter("PT", "SHAPE", inputShape, SeShapeFilter.METHOD_AI);
SeFilter[] filters = new SeFilter[] { filter };
query .setSpatialConstraints(SeQuery.SE_SPATIAL_FIRST, true, filters);
query.execute();
SeRow row = query.fetch();
while (row != null) {
try {
int objectid = row.getInteger(0);
SeShape shape = row.getShape(1);
String name = row.getNString(2);
System.out.println(name);
} catch (Exception e) {
e.printStackTrace();
}
row = query.fetch();
}
} catch (SeException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SeException e) {
e.printStackTrace();
}
}
}
查询还可以进行表连接，比如一个空间表连接一个业务表：
SeConnection conn = getConn();
if (conn != null) {
try {
String t1 = "CITIES";
String t2 = "WUYF_CITIES_JOIN";
SeTable table1 = new SeTable(conn, t1);
SeColumnDefinition[] tableDef1 = table1.describe();
int numCols1 = tableDef1.length;
SeTable table2 = new SeTable(conn, t2);
SeColumnDefinition[] tableDef2 = table2.describe();
int numCols2 = tableDef2.length;
String[] cols = new String[numCols1 + numCols2];
for (int i = 0; i < numCols1; i++) {
cols[i] = tableDef1[i].getName();
}
for (int i = 0; i < numCols2; i++) {
cols[i + numCols1] = tableDef2[i].getName();
}
SeSqlConstruct sqlCons = new SeSqlConstruct(
new String[] { t1, t2 }, "");
SeQuery query = new SeQuery(conn, cols, sqlCons);
SeQueryInfo queryInfo = new SeQueryInfo();
queryInfo.setQueryType(SeQueryInfo.SE_QUERYTYPE_ATTRIBUTE_FIRST);
query.prepareQueryInfo(queryInfo);
query.execute();
SeRow row = query.fetch();
while (row != null) {
for (int j = 0; j < cols.length; j++) {
System.out.println(row.getObject(j).toString());
}
System.out.println("-----------------------");
row = query.fetch();
}
} catch (SeException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SeException e) {
e.printStackTrace();
}
}
}
· 修改
修改数据操作封装在SeUpdate类中，如下的代码展示了如何在一个名为“PT”的点图层中修改数据：
SeConnection conn = getConn();
if (conn != null) {
try {
SeUpdate update = new SeUpdate(conn);
update.toTable("PT", new String[] { "NAME" }, "OBJECTID=5");
SeRow row = update.getRowToSet();
row.setNString(0, "修改");
update.execute();
update.close();
} catch (SeException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SeException e) {
e.printStackTrace();
}
}
}
· 删除
删除数据操作封装在SeDelete类中，如下的代码展示了如何在一个名为“PT”的点图层中删除数据：
SeConnection conn = getConn();
if (conn != null) {
try {
SeDelete delete = new SeDelete(conn);
delete.fromTable("PT", "OBJECTID>4");
delete.close();
} catch (SeException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (SeException e) {
e.printStackTrace();
}
}
}