PostGIS  2.5.0dev-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 1267 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().

1268 {
1269  stringbuffer_t *sb;
1270  char *ret;
1271  int j;
1272 
1273  /* Create the stringbuffer containing the header; we use this API as it's easier
1274  for handling string resizing during append */
1275  sb = stringbuffer_create();
1276  stringbuffer_clear(sb);
1277 
1278  /* Set the client encoding if required */
1279  if (state->config->encoding)
1280  {
1281  stringbuffer_aprintf(sb, "SET CLIENT_ENCODING TO UTF8;\n");
1282  }
1283 
1284  /* Use SQL-standard string escaping rather than PostgreSQL standard */
1285  stringbuffer_aprintf(sb, "SET STANDARD_CONFORMING_STRINGS TO ON;\n");
1286 
1287  /* Drop table if requested */
1288  if (state->config->opt == 'd')
1289  {
1301  if (state->config->schema)
1302  {
1303  if (state->config->readshape == 1 && (! state->config->geography) )
1304  {
1305  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('%s','%s','%s');\n",
1306  state->config->schema, state->config->table, state->geo_col);
1307  }
1308 
1309  stringbuffer_aprintf(sb, "DROP TABLE IF EXISTS \"%s\".\"%s\";\n", state->config->schema,
1310  state->config->table);
1311  }
1312  else
1313  {
1314  if (state->config->readshape == 1 && (! state->config->geography) )
1315  {
1316  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('','%s','%s');\n",
1317  state->config->table, state->geo_col);
1318  }
1319 
1320  stringbuffer_aprintf(sb, "DROP TABLE IF EXISTS \"%s\";\n", state->config->table);
1321  }
1322  }
1323 
1324  /* Start of transaction if we are using one */
1325  if (state->config->usetransaction)
1326  {
1327  stringbuffer_aprintf(sb, "BEGIN;\n");
1328  }
1329 
1330  /* If not in 'append' mode create the spatial table */
1331  if (state->config->opt != 'a')
1332  {
1333  /*
1334  * Create a table for inserting the shapes into with appropriate
1335  * columns and types
1336  */
1337  if (state->config->schema)
1338  {
1339  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\".\"%s\" (gid serial",
1340  state->config->schema, state->config->table);
1341  }
1342  else
1343  {
1344  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\" (gid serial", state->config->table);
1345  }
1346 
1347  /* Generate the field types based upon the shapefile information */
1348  for (j = 0; j < state->num_fields; j++)
1349  {
1350  stringbuffer_aprintf(sb, ",\n\"%s\" ", state->field_names[j]);
1351 
1352  /* First output the raw field type string */
1353  stringbuffer_aprintf(sb, "%s", state->pgfieldtypes[j]);
1354 
1355  /* Some types do have typmods though... */
1356  if (!strcmp("varchar", state->pgfieldtypes[j]))
1357  stringbuffer_aprintf(sb, "(%d)", state->widths[j]);
1358 
1359  if (!strcmp("numeric", state->pgfieldtypes[j]))
1360  {
1361  /* Doubles we just allow PostgreSQL to auto-detect the size */
1362  if (state->types[j] != FTDouble)
1363  stringbuffer_aprintf(sb, "(%d,0)", state->widths[j]);
1364  }
1365  }
1366 
1367  /* Add the geography column directly to the table definition, we don't
1368  need to do an AddGeometryColumn() call. */
1369  if (state->config->readshape == 1 && state->config->geography)
1370  {
1371  char *dimschar;
1372 
1373  if (state->pgdims == 4)
1374  dimschar = "ZM";
1375  else
1376  dimschar = "";
1377 
1378  if (state->to_srid != SRID_UNKNOWN && state->to_srid != 4326)
1379  {
1380  snprintf(state->message, SHPLOADERMSGLEN, _("Invalid SRID for geography type: %d"), state->to_srid);
1382  return SHPLOADERERR;
1383  }
1384  stringbuffer_aprintf(sb, ",\n\"%s\" geography(%s%s,%d)", state->geo_col, state->pgtype, dimschar, 4326);
1385  }
1386  stringbuffer_aprintf(sb, ")");
1387 
1388  /* Tablespace is optional. */
1389  if (state->config->tablespace != NULL)
1390  {
1391  stringbuffer_aprintf(sb, " TABLESPACE \"%s\"", state->config->tablespace);
1392  }
1393  stringbuffer_aprintf(sb, ";\n");
1394 
1395  /* Create the primary key. This is done separately because the index for the PK needs
1396  * to be in the correct tablespace. */
1397 
1398  /* TODO: Currently PostgreSQL does not allow specifying an index to use for a PK (so you get
1399  * a default one called table_pkey) and it does not provide a way to create a PK index
1400  * in a specific tablespace. So as a hacky solution we create the PK, then move the
1401  * index to the correct tablespace. Eventually this should be:
1402  * CREATE INDEX table_pkey on table(gid) TABLESPACE tblspc;
1403  * ALTER TABLE table ADD PRIMARY KEY (gid) USING INDEX table_pkey;
1404  * A patch has apparently been submitted to PostgreSQL to enable this syntax, see this thread:
1405  * http://archives.postgresql.org/pgsql-hackers/2011-01/msg01405.php */
1406  stringbuffer_aprintf(sb, "ALTER TABLE ");
1407 
1408  /* Schema is optional, include if present. */
1409  if (state->config->schema)
1410  {
1411  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1412  }
1413  stringbuffer_aprintf(sb, "\"%s\" ADD PRIMARY KEY (gid);\n", state->config->table);
1414 
1415  /* Tablespace is optional for the index. */
1416  if (state->config->idxtablespace != NULL)
1417  {
1418  stringbuffer_aprintf(sb, "ALTER INDEX ");
1419  if (state->config->schema)
1420  {
1421  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1422  }
1423 
1424  /* WARNING: We're assuming the default "table_pkey" name for the primary
1425  * key index. PostgreSQL may use "table_pkey1" or similar in the
1426  * case of a name conflict, so you may need to edit the produced
1427  * SQL in this rare case. */
1428  stringbuffer_aprintf(sb, "\"%s_pkey\" SET TABLESPACE \"%s\";\n",
1429  state->config->table, state->config->idxtablespace);
1430  }
1431 
1432  /* Create the geometry column with an addgeometry call */
1433  if (state->config->readshape == 1 && (!state->config->geography))
1434  {
1435  /* If they didn't specify a target SRID, see if they specified a source SRID. */
1436  int srid = state->to_srid;
1437  if (state->config->schema)
1438  {
1439  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('%s','%s','%s','%d',",
1440  state->config->schema, state->config->table, state->geo_col, srid);
1441  }
1442  else
1443  {
1444  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('','%s','%s','%d',",
1445  state->config->table, state->geo_col, srid);
1446  }
1447 
1448  stringbuffer_aprintf(sb, "'%s',%d);\n", state->pgtype, state->pgdims);
1449  }
1450  }
1451 
1452  /* Copy the string buffer into a new string, destroying the string buffer */
1453  ret = (char *)malloc(strlen((char *)stringbuffer_getstring(sb)) + 1);
1454  strcpy(ret, (char *)stringbuffer_getstring(sb));
1456 
1457  *strheader = ret;
1458 
1459  return SHPLOADEROK;
1460 }
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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