PostGIS  2.5.0beta2dev-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 1273 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().

1274 {
1275  stringbuffer_t *sb;
1276  char *ret;
1277  int j;
1278 
1279  /* Create the stringbuffer containing the header; we use this API as it's easier
1280  for handling string resizing during append */
1281  sb = stringbuffer_create();
1282  stringbuffer_clear(sb);
1283 
1284  /* Set the client encoding if required */
1285  if (state->config->encoding)
1286  {
1287  stringbuffer_aprintf(sb, "SET CLIENT_ENCODING TO UTF8;\n");
1288  }
1289 
1290  /* Use SQL-standard string escaping rather than PostgreSQL standard */
1291  stringbuffer_aprintf(sb, "SET STANDARD_CONFORMING_STRINGS TO ON;\n");
1292 
1293  /* Drop table if requested */
1294  if (state->config->opt == 'd')
1295  {
1307  if (state->config->schema)
1308  {
1309  if (state->config->readshape == 1 && (! state->config->geography) )
1310  {
1311  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('%s','%s','%s');\n",
1312  state->config->schema, state->config->table, state->geo_col);
1313  }
1314 
1315  stringbuffer_aprintf(sb, "DROP TABLE IF EXISTS \"%s\".\"%s\";\n", state->config->schema,
1316  state->config->table);
1317  }
1318  else
1319  {
1320  if (state->config->readshape == 1 && (! state->config->geography) )
1321  {
1322  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('','%s','%s');\n",
1323  state->config->table, state->geo_col);
1324  }
1325 
1326  stringbuffer_aprintf(sb, "DROP TABLE IF EXISTS \"%s\";\n", state->config->table);
1327  }
1328  }
1329 
1330  /* Start of transaction if we are using one */
1331  if (state->config->usetransaction)
1332  {
1333  stringbuffer_aprintf(sb, "BEGIN;\n");
1334  }
1335 
1336  /* If not in 'append' mode create the spatial table */
1337  if (state->config->opt != 'a')
1338  {
1339  /*
1340  * Create a table for inserting the shapes into with appropriate
1341  * columns and types
1342  */
1343  if (state->config->schema)
1344  {
1345  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\".\"%s\" (gid serial",
1346  state->config->schema, state->config->table);
1347  }
1348  else
1349  {
1350  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\" (gid serial", state->config->table);
1351  }
1352 
1353  /* Generate the field types based upon the shapefile information */
1354  for (j = 0; j < state->num_fields; j++)
1355  {
1356  stringbuffer_aprintf(sb, ",\n\"%s\" ", state->field_names[j]);
1357 
1358  /* First output the raw field type string */
1359  stringbuffer_aprintf(sb, "%s", state->pgfieldtypes[j]);
1360 
1361  /* Some types do have typmods though... */
1362  if (!strcmp("varchar", state->pgfieldtypes[j]))
1363  stringbuffer_aprintf(sb, "(%d)", state->widths[j]);
1364 
1365  if (!strcmp("numeric", state->pgfieldtypes[j]))
1366  {
1367  /* Doubles we just allow PostgreSQL to auto-detect the size */
1368  if (state->types[j] != FTDouble)
1369  stringbuffer_aprintf(sb, "(%d,0)", state->widths[j]);
1370  }
1371  }
1372 
1373  /* Add the geography column directly to the table definition, we don't
1374  need to do an AddGeometryColumn() call. */
1375  if (state->config->readshape == 1 && state->config->geography)
1376  {
1377  char *dimschar;
1378 
1379  if (state->pgdims == 4)
1380  dimschar = "ZM";
1381  else
1382  dimschar = "";
1383 
1384  if (state->to_srid != SRID_UNKNOWN && state->to_srid != 4326)
1385  {
1386  snprintf(state->message, SHPLOADERMSGLEN, _("Invalid SRID for geography type: %d"), state->to_srid);
1388  return SHPLOADERERR;
1389  }
1390  stringbuffer_aprintf(sb, ",\n\"%s\" geography(%s%s,%d)", state->geo_col, state->pgtype, dimschar, 4326);
1391  }
1392  stringbuffer_aprintf(sb, ")");
1393 
1394  /* Tablespace is optional. */
1395  if (state->config->tablespace != NULL)
1396  {
1397  stringbuffer_aprintf(sb, " TABLESPACE \"%s\"", state->config->tablespace);
1398  }
1399  stringbuffer_aprintf(sb, ";\n");
1400 
1401  /* Create the primary key. This is done separately because the index for the PK needs
1402  * to be in the correct tablespace. */
1403 
1404  /* TODO: Currently PostgreSQL does not allow specifying an index to use for a PK (so you get
1405  * a default one called table_pkey) and it does not provide a way to create a PK index
1406  * in a specific tablespace. So as a hacky solution we create the PK, then move the
1407  * index to the correct tablespace. Eventually this should be:
1408  * CREATE INDEX table_pkey on table(gid) TABLESPACE tblspc;
1409  * ALTER TABLE table ADD PRIMARY KEY (gid) USING INDEX table_pkey;
1410  * A patch has apparently been submitted to PostgreSQL to enable this syntax, see this thread:
1411  * http://archives.postgresql.org/pgsql-hackers/2011-01/msg01405.php */
1412  stringbuffer_aprintf(sb, "ALTER TABLE ");
1413 
1414  /* Schema is optional, include if present. */
1415  if (state->config->schema)
1416  {
1417  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1418  }
1419  stringbuffer_aprintf(sb, "\"%s\" ADD PRIMARY KEY (gid);\n", state->config->table);
1420 
1421  /* Tablespace is optional for the index. */
1422  if (state->config->idxtablespace != NULL)
1423  {
1424  stringbuffer_aprintf(sb, "ALTER INDEX ");
1425  if (state->config->schema)
1426  {
1427  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1428  }
1429 
1430  /* WARNING: We're assuming the default "table_pkey" name for the primary
1431  * key index. PostgreSQL may use "table_pkey1" or similar in the
1432  * case of a name conflict, so you may need to edit the produced
1433  * SQL in this rare case. */
1434  stringbuffer_aprintf(sb, "\"%s_pkey\" SET TABLESPACE \"%s\";\n",
1435  state->config->table, state->config->idxtablespace);
1436  }
1437 
1438  /* Create the geometry column with an addgeometry call */
1439  if (state->config->readshape == 1 && (!state->config->geography))
1440  {
1441  /* If they didn't specify a target SRID, see if they specified a source SRID. */
1442  int srid = state->to_srid;
1443  if (state->config->schema)
1444  {
1445  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('%s','%s','%s','%d',",
1446  state->config->schema, state->config->table, state->geo_col, srid);
1447  }
1448  else
1449  {
1450  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('','%s','%s','%d',",
1451  state->config->table, state->geo_col, srid);
1452  }
1453 
1454  stringbuffer_aprintf(sb, "'%s',%d);\n", state->pgtype, state->pgdims);
1455  }
1456  }
1457 
1458  /* Copy the string buffer into a new string, destroying the string buffer */
1459  ret = (char *)malloc(strlen((char *)stringbuffer_getstring(sb)) + 1);
1460  strcpy(ret, (char *)stringbuffer_getstring(sb));
1462 
1463  *strheader = ret;
1464 
1465  return SHPLOADEROK;
1466 }
SHPLOADERCONFIG * config
DBFFieldType * types
stringbuffer_t * stringbuffer_create(void)
Allocate a new stringbuffer_t.
Definition: stringbuffer.c:35
#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:253
void stringbuffer_clear(stringbuffer_t *s)
Reset the stringbuffer_t.
Definition: stringbuffer.c:90
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:187
#define SHPLOADEROK
char message[SHPLOADERMSGLEN]
void stringbuffer_destroy(stringbuffer_t *s)
Free the stringbuffer_t and all memory managed within it.
Definition: stringbuffer.c:78
const char * stringbuffer_getstring(stringbuffer_t *s)
Returns a reference to the internal string being managed by the stringbuffer.
Definition: stringbuffer.c:149
void * malloc(YYSIZE_T)
#define SHPLOADERERR
#define SHPLOADERMSGLEN
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