ST_PolyFromWKB verwendet eine bekannte binäre Darstellung des Typs Polygon und die Identität eines räumlichen Bezugssystems und gibt ein Polygon zurück.
Syntax
db2gse.ST_PolyFromWKB(WKBPolygon Blob(1M), SRID Integer)
Rückgabetyp
db2gse.ST_Polygon
Beispiele
Der folgende Codeabschnitt füllt die Tabelle SENSITIVE_AREAS aus.
Die Tabelle SENSITIVE_AREAS enthält verschiedene Spalten, die die gefährdeten Institutionen beschreiben, zusätzlich zu der Spalte zone, die die Polygongeometrie der Institution beschreibt.
CREATE TABLE SENSITIVE_AREAS (id integer, name varchar(128), size float, type varchar(10), zone db2gse.ST_Polygon); /* Create the SQL insert statement to populate the id, name, size, type and zone. The question marks are parameter markers that indicate the id,name, size, type and zone values that will be retrieved at runtime. */ strcpy (shp_wkb,"insert into SENSITIVE_AREAS (id, name, size, type, zone) values (?,?,?,?, db2gse.ST_PolyFromWKB (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 *)wkb_sql, SQL_NTS); /* Bind the id integer value to the first parameter. */ pcbvalue1 = 0; rc = SQLBindParameter (hstmt, 1, SQL_PARAM_INPUT, SQL_C_INTEGER, SQL_INTEGER, 0, 0, &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 size float to the third parameter. */ pcbvalue3 = 0; rc = SQLBindParameter (hstmt, 3, SQL_PARAM_INPUT, SQL_C_FLOAT, SQL_REAL, 0, 0, &size, 0, &pcbvalue3); /* Bind the type varchar to the fourth parameter. */ pcbvalue4 = type_len; rc = SQLBindParameter (hstmt, 3, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_VARCHAR, type_len, 0, type, type_len, &pcbvalue4); /* Bind the zone polygon to the fifth parameter. */ pcbvalue5 = zone_len; rc = SQLBindParameter (hstmt, 3, SQL_PARAM_INPUT, SQL_C_BINARY, SQL_BLOB, zone_len, 0, zone_wkb, zone_len, &pcbvalue5); /* Execute the insert statement. */ rc = SQLExecute (hstmt);