PointFromShape utilise en entrée une forme de type point et un identificateur de système de références spatiales, et renvoie un point.
Syntaxe
db2gse.PointFromShape(db2gse.ShapePoint blob(1M), SRID db2gse.coordref)
Type de retour
db2gse.ST_Point
Exemples
Ce fragment de programme peuple la table HAZARDOUS_SITES.
Les sites à risque sont stockés dans la table HAZARDOUS_SITES créée avec l'instruction CREATE TABLE présentée ci-après. La colonne LOCATION, définie en tant que point, stocke une position représentant le centre géographique du site à risque.
CREATE TABLE HAZARDOUS_SITES (site_id integer, name varchar(128), location db2gse.ST_Point); /* Create the SQL insert statement to populate the site_id, name and location. The question marks are parameter markers that indicate the site_id, name and location values that will be retrieved at runtime. */ strcpy (shp_sql,"insert into HAZARDOUS_SITES (site_id, name, location) values (?,?, db2gse.PointFromShape (cast(? as blob(1m)), db2gse.coordref()..srid(0)))"); /* Allocate memory for the SQL statement handle and associate the statement handle with the connection handle. */ rc = SQLAllocStmt (handle, &hstmt); /* Prepare the SQL statement for execution. */ rc = SQLPrepare (hstmt, (unsigned char *)shp_sql, SQL_NTS); /* Bind the site_id integer value to the first parameter. */ pcbvalue1 = 0; rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_INTEGER, SQL_INTEGER, 0, 0, &site_id, 0, &pcbvalue1); /* Bind the name varchar value to the second parameter. */ pcbvalue2 = name_len; rc = SQLBindParameter (hstmt, 2, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, 0, 0, name, 0, &pcbvalue2); /* Bind the location shape to the third parameter. */ pcbvalue3 = location_len; rc = SQLBindParameter (hstmt, 3, SQL_PARAM_INPUT, SQL_C_BINARY, SQL_BLOB, location_len, 0, location_shape, location_len, &pcbvalue3); /* Execute the insert statement. */ rc = SQLExecute (hstmt);