PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ ShpLoaderGetSQLHeader()

int ShpLoaderGetSQLHeader ( SHPLOADERSTATE state,
char **  strheader 
)

TODO: if the table has more then one geometry column the DROP TABLE call will leave spurious records in geometry_columns.

If the geometry column in the table being dropped does not match 'the_geom' or the name specified with -g an error is returned by DropGeometryColumn.

The table to be dropped might not exist.

Definition at line 1263 of file shp2pgsql-core.c.

References _, shp_loader_state::config, shp_loader_config::encoding, shp_loader_state::field_names, shp_loader_state::geo_col, shp_loader_config::geography, shp_loader_config::idxtablespace, malloc(), shp_loader_state::message, shp_loader_state::num_fields, shp_loader_config::opt, shp_loader_state::pgdims, shp_loader_state::pgfieldtypes, shp_loader_state::pgtype, shp_loader_config::readshape, shp_loader_config::schema, SHPLOADERERR, SHPLOADERMSGLEN, SHPLOADEROK, SRID_UNKNOWN, stringbuffer_aprintf(), stringbuffer_clear(), stringbuffer_create(), stringbuffer_destroy(), stringbuffer_getstring(), shp_loader_config::table, shp_loader_config::tablespace, shp_loader_state::to_srid, shp_loader_state::types, shp_loader_config::usetransaction, and shp_loader_state::widths.

Referenced by main(), and pgui_action_import().

1264 {
1265  stringbuffer_t *sb;
1266  char *ret;
1267  int j;
1268 
1269  /* Create the stringbuffer containing the header; we use this API as it's easier
1270  for handling string resizing during append */
1271  sb = stringbuffer_create();
1272  stringbuffer_clear(sb);
1273 
1274  /* Set the client encoding if required */
1275  if (state->config->encoding)
1276  {
1277  stringbuffer_aprintf(sb, "SET CLIENT_ENCODING TO UTF8;\n");
1278  }
1279 
1280  /* Use SQL-standard string escaping rather than PostgreSQL standard */
1281  stringbuffer_aprintf(sb, "SET STANDARD_CONFORMING_STRINGS TO ON;\n");
1282 
1283  /* Drop table if requested */
1284  if (state->config->opt == 'd')
1285  {
1297  if (state->config->schema)
1298  {
1299  if (state->config->readshape == 1 && (! state->config->geography) )
1300  {
1301  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('%s','%s','%s');\n",
1302  state->config->schema, state->config->table, state->geo_col);
1303  }
1304 
1305  stringbuffer_aprintf(sb, "DROP TABLE \"%s\".\"%s\";\n", state->config->schema,
1306  state->config->table);
1307  }
1308  else
1309  {
1310  if (state->config->readshape == 1 && (! state->config->geography) )
1311  {
1312  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('','%s','%s');\n",
1313  state->config->table, state->geo_col);
1314  }
1315 
1316  stringbuffer_aprintf(sb, "DROP TABLE \"%s\";\n", state->config->table);
1317  }
1318  }
1319 
1320  /* Start of transaction if we are using one */
1321  if (state->config->usetransaction)
1322  {
1323  stringbuffer_aprintf(sb, "BEGIN;\n");
1324  }
1325 
1326  /* If not in 'append' mode create the spatial table */
1327  if (state->config->opt != 'a')
1328  {
1329  /*
1330  * Create a table for inserting the shapes into with appropriate
1331  * columns and types
1332  */
1333  if (state->config->schema)
1334  {
1335  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\".\"%s\" (gid serial",
1336  state->config->schema, state->config->table);
1337  }
1338  else
1339  {
1340  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\" (gid serial", state->config->table);
1341  }
1342 
1343  /* Generate the field types based upon the shapefile information */
1344  for (j = 0; j < state->num_fields; j++)
1345  {
1346  stringbuffer_aprintf(sb, ",\n\"%s\" ", state->field_names[j]);
1347 
1348  /* First output the raw field type string */
1349  stringbuffer_aprintf(sb, "%s", state->pgfieldtypes[j]);
1350 
1351  /* Some types do have typmods though... */
1352  if (!strcmp("varchar", state->pgfieldtypes[j]))
1353  stringbuffer_aprintf(sb, "(%d)", state->widths[j]);
1354 
1355  if (!strcmp("numeric", state->pgfieldtypes[j]))
1356  {
1357  /* Doubles we just allow PostgreSQL to auto-detect the size */
1358  if (state->types[j] != FTDouble)
1359  stringbuffer_aprintf(sb, "(%d,0)", state->widths[j]);
1360  }
1361  }
1362 
1363  /* Add the geography column directly to the table definition, we don't
1364  need to do an AddGeometryColumn() call. */
1365  if (state->config->readshape == 1 && state->config->geography)
1366  {
1367  char *dimschar;
1368 
1369  if (state->pgdims == 4)
1370  dimschar = "ZM";
1371  else
1372  dimschar = "";
1373 
1374  if (state->to_srid != SRID_UNKNOWN && state->to_srid != 4326)
1375  {
1376  snprintf(state->message, SHPLOADERMSGLEN, _("Invalid SRID for geography type: %d"), state->to_srid);
1378  return SHPLOADERERR;
1379  }
1380  stringbuffer_aprintf(sb, ",\n\"%s\" geography(%s%s,%d)", state->geo_col, state->pgtype, dimschar, 4326);
1381  }
1382  stringbuffer_aprintf(sb, ")");
1383 
1384  /* Tablespace is optional. */
1385  if (state->config->tablespace != NULL)
1386  {
1387  stringbuffer_aprintf(sb, " TABLESPACE \"%s\"", state->config->tablespace);
1388  }
1389  stringbuffer_aprintf(sb, ";\n");
1390 
1391  /* Create the primary key. This is done separately because the index for the PK needs
1392  * to be in the correct tablespace. */
1393 
1394  /* TODO: Currently PostgreSQL does not allow specifying an index to use for a PK (so you get
1395  * a default one called table_pkey) and it does not provide a way to create a PK index
1396  * in a specific tablespace. So as a hacky solution we create the PK, then move the
1397  * index to the correct tablespace. Eventually this should be:
1398  * CREATE INDEX table_pkey on table(gid) TABLESPACE tblspc;
1399  * ALTER TABLE table ADD PRIMARY KEY (gid) USING INDEX table_pkey;
1400  * A patch has apparently been submitted to PostgreSQL to enable this syntax, see this thread:
1401  * http://archives.postgresql.org/pgsql-hackers/2011-01/msg01405.php */
1402  stringbuffer_aprintf(sb, "ALTER TABLE ");
1403 
1404  /* Schema is optional, include if present. */
1405  if (state->config->schema)
1406  {
1407  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1408  }
1409  stringbuffer_aprintf(sb, "\"%s\" ADD PRIMARY KEY (gid);\n", state->config->table);
1410 
1411  /* Tablespace is optional for the index. */
1412  if (state->config->idxtablespace != NULL)
1413  {
1414  stringbuffer_aprintf(sb, "ALTER INDEX ");
1415  if (state->config->schema)
1416  {
1417  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1418  }
1419 
1420  /* WARNING: We're assuming the default "table_pkey" name for the primary
1421  * key index. PostgreSQL may use "table_pkey1" or similar in the
1422  * case of a name conflict, so you may need to edit the produced
1423  * SQL in this rare case. */
1424  stringbuffer_aprintf(sb, "\"%s_pkey\" SET TABLESPACE \"%s\";\n",
1425  state->config->table, state->config->idxtablespace);
1426  }
1427 
1428  /* Create the geometry column with an addgeometry call */
1429  if (state->config->readshape == 1 && (!state->config->geography))
1430  {
1431  /* If they didn't specify a target SRID, see if they specified a source SRID. */
1432  int srid = state->to_srid;
1433  if (state->config->schema)
1434  {
1435  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('%s','%s','%s','%d',",
1436  state->config->schema, state->config->table, state->geo_col, srid);
1437  }
1438  else
1439  {
1440  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('','%s','%s','%d',",
1441  state->config->table, state->geo_col, srid);
1442  }
1443 
1444  stringbuffer_aprintf(sb, "'%s',%d);\n", state->pgtype, state->pgdims);
1445  }
1446  }
1447 
1448  /* Copy the string buffer into a new string, destroying the string buffer */
1449  ret = (char *)malloc(strlen((char *)stringbuffer_getstring(sb)) + 1);
1450  strcpy(ret, (char *)stringbuffer_getstring(sb));
1452 
1453  *strheader = ret;
1454 
1455  return SHPLOADEROK;
1456 }
SHPLOADERCONFIG * config
DBFFieldType * types
stringbuffer_t * stringbuffer_create(void)
Allocate a new stringbuffer_t.
Definition: stringbuffer.c:46
#define _(String)
Definition: shpcommon.h:24
int stringbuffer_aprintf(stringbuffer_t *s, const char *fmt,...)
Appends a formatted string to the current string buffer, using the format and argument list provided...
Definition: stringbuffer.c:246
void stringbuffer_clear(stringbuffer_t *s)
Reset the stringbuffer_t.
Definition: stringbuffer.c:83
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:172
#define SHPLOADEROK
char message[SHPLOADERMSGLEN]
void stringbuffer_destroy(stringbuffer_t *s)
Free the stringbuffer_t and all memory managed within it.
Definition: stringbuffer.c:71
const char * stringbuffer_getstring(stringbuffer_t *s)
Returns a reference to the internal string being managed by the stringbuffer.
Definition: stringbuffer.c:142
void * malloc(YYSIZE_T)
#define SHPLOADERERR
#define SHPLOADERMSGLEN
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