Guide d'utilisation et de référence

ST_PolyFromWKB

ST_PolyFromWKB utilise en entrée une représentation WKB du type polygone et un identificateur de système de références spatiales, et renvoie un polygone.

Syntaxe

db2gse.ST_PolyFromWKB(WKBPolygon Blob(1M), SRID db2gse.coordref)

Type de retour

db2gse.ST_Polygon

Exemples

Le fragment de code ci-après peuple la table SENSITIVE_AREAS.

Cette table contient plusieurs colonnes qui décrivent les établissements menacés, en sus de la colonne zone qui stocke la géométrie de type polygone des établissements.

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); 


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