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Make postgres column comments available for the layer properties metadata

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tab (address ticket #244)


git-svn-id: http://svn.osgeo.org/qgis/trunk@6677 c8812cc2-4d05-0410-92ff-de0c093fc19c
This commit is contained in:
g_j_m 2007-02-23 05:45:49 +00:00
parent 772f5d0a52
commit f57b006b92
1 changed files with 35 additions and 9 deletions
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44
src/providers/postgres/qgspostgresprovider.cpp
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@ -169,19 +169,42 @@ QgsPostgresProvider::QgsPostgresProvider(QString const & uri)
calculateExtents();
getFeatureCount();
// Get the relation oid for use in later queries
sql = "select oid from pg_class where relname = '" + mTableName + "' and relnamespace = ("
"select oid from pg_namespace where nspname = '" + mSchemaName + "')";
PGresult *tresult= PQexec(pd, (const char *)(sql.utf8()));
QString tableoid = PQgetvalue(tresult, 0, 0);
PQclear(tresult);
/* Code to extrac the table description. Needs a way to make is accesssible
to the rest of qgis...
// Get the table description
sql = "SELECT description FROM pg_description WHERE "
"classoid = " + tableoid + " AND objsubid = 0";
tresult = PQexec(pd, (const char*) sql.utf8());
if (PQntuples(tresult) > 0)
mDescription = PQgetvalue(tresult, 0, 0);
PQclear(tresult);
*/
// Populate the field vector for this layer. The field vector contains
// field name, type, length, and precision (if numeric)
sql = "select * from " + mSchemaTableName + " limit 1";
PGresult* result = PQexec(pd, (const char *) (sql.utf8()));
PGresult *result = PQexec(pd, (const char *) (sql.utf8()));
//--std::cout << "Field: Name, Type, Size, Modifier:" << std::endl;
// The queries inside this loop could possibly be combined into one
// single query - this would make the code run faster.
for (int i = 0; i < PQnfields(result); i++)
{
QString fieldName = PQfname(result, i);
int fldtyp = PQftype(result, i);
QString typOid = QString().setNum(fldtyp);
int fieldModifier = PQfmod(result, i);
QString fieldComment = "";
QString fieldComment("");
sql = "select typelem from pg_type where typelem = " + typOid + " and typlen = -1";
// //--std::cout << sql << std::endl;
@ -197,15 +220,18 @@ QgsPostgresProvider::QgsPostgresProvider(QString const & uri)
QString fieldSize = PQgetvalue(oidResult, 0, 1);
PQclear(oidResult);
sql = "select oid from pg_class where relname = '" + mTableName + "' and relnamespace = ("
"select oid from pg_namespace where nspname = '" + mSchemaName + "')";
PGresult *tresult= PQexec(pd, (const char *)(sql.utf8()));
QString tableoid = PQgetvalue(tresult, 0, 0);
sql = "select attnum from pg_attribute where attrelid = " + tableoid + " and attname = '" + fieldName + "'";
PGresult *tresult = PQexec(pd, (const char *)(sql.utf8()));
QString attnum = PQgetvalue(tresult, 0, 0);
PQclear(tresult);
sql = "select attnum from pg_attribute where attrelid = " + tableoid + " and attname = '" + fieldName + "'";
tresult = PQexec(pd, (const char *)(sql.utf8()));
QString attnum = PQgetvalue(tresult, 0, 0);
sql = "SELECT description FROM pg_description WHERE objoid = " + tableoid +
" AND objsubid = " + attnum;
tresult = PQexec(pd, (const char*)(sql.utf8()));
if (PQntuples(tresult) > 0)
fieldComment = PQgetvalue(tresult, 0, 0);
PQclear(tresult);
QgsDebugMsg("Field: " + attnum + " maps to " + QString::number(i) + " " + fieldName + ", "