OracleSpatial建表学习.doc

Step1. 创建一张表，其中shape用来存放空间数据 CREATE TABLE mylake (feature_id NUMBER PRIMARY KEY,name VARCHAR2(32),shape MDSYS.SDO_GEOMETRY); Step2. 在user_sdo_geom_metadata 表中插入新记录，用于描述空间字段INSERT INTO user_sdo_geom_metadata VALUES (mylake,????//---表名??? shape,????//---字段名??? MDSYS.SDO_DIM_ARRAY(???MDSYS.SDO_DIM_ELEMENT(X, 0, 100, 0.05),????//---X维最小，最大值和容忍度。??????? MDSYS.SDO_DIM_ELEMENT(Y, 0, 100, 0.05)????//---Y维最小，最大值和容忍度??? ),NULL????//---坐标系，缺省为笛卡尔坐标系); Step3. 创建空间索引 CREATE INDEX mylake_idx ON mylake(shape) INDEXTYPE IS MDSYS.SPATIAL_INDEX Step4. 插入空间数据Oracle Spatial用MDSYS.SDO_GEOMETRY来存储空间数据,定义为：CREATE TYPE sdo_geometry AS OBJECT (SDO_GTYPE NUMBER,SDO_SRID NUMBER,SDO_POINT SDO_POINT_TYPE,SDO_ELEM_INFO MDSYS.SDO_ELEM_INFO_ARRAY,SDO_ORDINATES MDSYS.SDO_ORDINATE_ARRAY);SDO_GTYPE：用四个数字定义了所有的形状??????????? 第一位:维数??????????? 第二位:线性表示。用于3，4维数据，二维为0??????????? 最后两位: Value Geometry Description 00 UNKNOWN_GEOMETRY Spatial ignores this value 01 POINT A single point element 02 LINE or CURVE Contains one line string element that may be linear, curved or both 03 POLYGON Contains one polygon element with or without other polygon elements in it 04 COLLECTION A heterogeneous collection of elements 05 MULTIPOINT Contains one or more points 06 MULTILINE or MULTICURVE Contains one or more line string elements 07 MULTIPOLYGON Contains multiple polygon elements that maybe disjoint SDO_SRID：坐标系，NULL为笛卡尔坐标系。SDO_POINT：Oracle Spatial也可定义单个的点，SDO_POINT的定义:??? CREATE TYPE sdo_point_type AS OBJECT (X NUMBER,Y NUMBER,Z NUMBER);??? 如果是二维，Z为NULL。SDO_ELEM_INFO：每三个值描述一个元素。????????????????第一个值：第一个顶点在SDO_ORDINATES_ARR开始位置????????????????第二个值：元素类型????????????????第三个值：顶点连接方式：1-通过直线连接，2-通过圆弧连接??? 定义为??? CREATE TYPE sdo_elem_info_array AS VARRAY (1048576) of NUMBER;SDO_ORDINATES：几何图形所有顶点列表。定义为??? CREATE TYPE sdo_ordinate_array AS VARRAY (1048576) of NUMBER; FONT color=#003366// 插入包含一个岛屿的湖泊INSERT INTO mylake VALUES(10, Lake Calhoun, MDSYS.SDO_GEOMETRY(2003,NULL,NULL