PostGIS  2.3.7dev-r@@SVN_REVISION@@
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 1265 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().

1266 {
1267  stringbuffer_t *sb;
1268  char *ret;
1269  int j;
1270 
1271  /* Create the stringbuffer containing the header; we use this API as it's easier
1272  for handling string resizing during append */
1273  sb = stringbuffer_create();
1274  stringbuffer_clear(sb);
1275 
1276  /* Set the client encoding if required */
1277  if (state->config->encoding)
1278  {
1279  stringbuffer_aprintf(sb, "SET CLIENT_ENCODING TO UTF8;\n");
1280  }
1281 
1282  /* Use SQL-standard string escaping rather than PostgreSQL standard */
1283  stringbuffer_aprintf(sb, "SET STANDARD_CONFORMING_STRINGS TO ON;\n");
1284 
1285  /* Drop table if requested */
1286  if (state->config->opt == 'd')
1287  {
1299  if (state->config->schema)
1300  {
1301  if (state->config->readshape == 1 && (! state->config->geography) )
1302  {
1303  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('%s','%s','%s');\n",
1304  state->config->schema, state->config->table, state->geo_col);
1305  }
1306 
1307  stringbuffer_aprintf(sb, "DROP TABLE IF EXISTS \"%s\".\"%s\";\n", state->config->schema,
1308  state->config->table);
1309  }
1310  else
1311  {
1312  if (state->config->readshape == 1 && (! state->config->geography) )
1313  {
1314  stringbuffer_aprintf(sb, "SELECT DropGeometryColumn('','%s','%s');\n",
1315  state->config->table, state->geo_col);
1316  }
1317 
1318  stringbuffer_aprintf(sb, "DROP TABLE IF EXISTS \"%s\";\n", state->config->table);
1319  }
1320  }
1321 
1322  /* Start of transaction if we are using one */
1323  if (state->config->usetransaction)
1324  {
1325  stringbuffer_aprintf(sb, "BEGIN;\n");
1326  }
1327 
1328  /* If not in 'append' mode create the spatial table */
1329  if (state->config->opt != 'a')
1330  {
1331  /*
1332  * Create a table for inserting the shapes into with appropriate
1333  * columns and types
1334  */
1335  if (state->config->schema)
1336  {
1337  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\".\"%s\" (gid serial",
1338  state->config->schema, state->config->table);
1339  }
1340  else
1341  {
1342  stringbuffer_aprintf(sb, "CREATE TABLE \"%s\" (gid serial", state->config->table);
1343  }
1344 
1345  /* Generate the field types based upon the shapefile information */
1346  for (j = 0; j < state->num_fields; j++)
1347  {
1348  stringbuffer_aprintf(sb, ",\n\"%s\" ", state->field_names[j]);
1349 
1350  /* First output the raw field type string */
1351  stringbuffer_aprintf(sb, "%s", state->pgfieldtypes[j]);
1352 
1353  /* Some types do have typmods though... */
1354  if (!strcmp("varchar", state->pgfieldtypes[j]))
1355  stringbuffer_aprintf(sb, "(%d)", state->widths[j]);
1356 
1357  if (!strcmp("numeric", state->pgfieldtypes[j]))
1358  {
1359  /* Doubles we just allow PostgreSQL to auto-detect the size */
1360  if (state->types[j] != FTDouble)
1361  stringbuffer_aprintf(sb, "(%d,0)", state->widths[j]);
1362  }
1363  }
1364 
1365  /* Add the geography column directly to the table definition, we don't
1366  need to do an AddGeometryColumn() call. */
1367  if (state->config->readshape == 1 && state->config->geography)
1368  {
1369  char *dimschar;
1370 
1371  if (state->pgdims == 4)
1372  dimschar = "ZM";
1373  else
1374  dimschar = "";
1375 
1376  if (state->to_srid != SRID_UNKNOWN && state->to_srid != 4326)
1377  {
1378  snprintf(state->message, SHPLOADERMSGLEN, _("Invalid SRID for geography type: %d"), state->to_srid);
1380  return SHPLOADERERR;
1381  }
1382  stringbuffer_aprintf(sb, ",\n\"%s\" geography(%s%s,%d)", state->geo_col, state->pgtype, dimschar, 4326);
1383  }
1384  stringbuffer_aprintf(sb, ")");
1385 
1386  /* Tablespace is optional. */
1387  if (state->config->tablespace != NULL)
1388  {
1389  stringbuffer_aprintf(sb, " TABLESPACE \"%s\"", state->config->tablespace);
1390  }
1391  stringbuffer_aprintf(sb, ";\n");
1392 
1393  /* Create the primary key. This is done separately because the index for the PK needs
1394  * to be in the correct tablespace. */
1395 
1396  /* TODO: Currently PostgreSQL does not allow specifying an index to use for a PK (so you get
1397  * a default one called table_pkey) and it does not provide a way to create a PK index
1398  * in a specific tablespace. So as a hacky solution we create the PK, then move the
1399  * index to the correct tablespace. Eventually this should be:
1400  * CREATE INDEX table_pkey on table(gid) TABLESPACE tblspc;
1401  * ALTER TABLE table ADD PRIMARY KEY (gid) USING INDEX table_pkey;
1402  * A patch has apparently been submitted to PostgreSQL to enable this syntax, see this thread:
1403  * http://archives.postgresql.org/pgsql-hackers/2011-01/msg01405.php */
1404  stringbuffer_aprintf(sb, "ALTER TABLE ");
1405 
1406  /* Schema is optional, include if present. */
1407  if (state->config->schema)
1408  {
1409  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1410  }
1411  stringbuffer_aprintf(sb, "\"%s\" ADD PRIMARY KEY (gid);\n", state->config->table);
1412 
1413  /* Tablespace is optional for the index. */
1414  if (state->config->idxtablespace != NULL)
1415  {
1416  stringbuffer_aprintf(sb, "ALTER INDEX ");
1417  if (state->config->schema)
1418  {
1419  stringbuffer_aprintf(sb, "\"%s\".",state->config->schema);
1420  }
1421 
1422  /* WARNING: We're assuming the default "table_pkey" name for the primary
1423  * key index. PostgreSQL may use "table_pkey1" or similar in the
1424  * case of a name conflict, so you may need to edit the produced
1425  * SQL in this rare case. */
1426  stringbuffer_aprintf(sb, "\"%s_pkey\" SET TABLESPACE \"%s\";\n",
1427  state->config->table, state->config->idxtablespace);
1428  }
1429 
1430  /* Create the geometry column with an addgeometry call */
1431  if (state->config->readshape == 1 && (!state->config->geography))
1432  {
1433  /* If they didn't specify a target SRID, see if they specified a source SRID. */
1434  int srid = state->to_srid;
1435  if (state->config->schema)
1436  {
1437  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('%s','%s','%s','%d',",
1438  state->config->schema, state->config->table, state->geo_col, srid);
1439  }
1440  else
1441  {
1442  stringbuffer_aprintf(sb, "SELECT AddGeometryColumn('','%s','%s','%d',",
1443  state->config->table, state->geo_col, srid);
1444  }
1445 
1446  stringbuffer_aprintf(sb, "'%s',%d);\n", state->pgtype, state->pgdims);
1447  }
1448  }
1449 
1450  /* Copy the string buffer into a new string, destroying the string buffer */
1451  ret = (char *)malloc(strlen((char *)stringbuffer_getstring(sb)) + 1);
1452  strcpy(ret, (char *)stringbuffer_getstring(sb));
1454 
1455  *strheader = ret;
1456 
1457  return SHPLOADEROK;
1458 }
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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