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use single query to get the information

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Jan Caha 2025-09-18 14:14:15 +02:00 committed by Nyall Dawson
parent 5cf505c584
commit 206cf49e41
1 changed files with 54 additions and 74 deletions
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128
src/providers/postgres/qgspostgresprovider.cpp
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@ -5180,93 +5180,73 @@ bool QgsPostgresProvider::hasMetadata() const
QString QgsPostgresProvider::htmlMetadata() const
{
const QString sqlTableOid = QStringLiteral( "SELECT oid FROM pg_class "
"WHERE relname = %1 AND relnamespace = %2::regnamespace;" )
.arg( QgsPostgresConn::quotedValue( mTableName ), QgsPostgresConn::quotedValue( mSchemaName ) );
// construct multiple temporary tables to be used with PostgreSQL WITH statement
// that build one on another and are then used to create single SQL query to get the additional metadata
QgsPostgresResult resTableOid( connectionRO()->LoggedPQexec( "QgsPostgresProvider", sqlTableOid ) );
const QString sqlWithTableInfo = QStringLiteral( "table_info AS ("
"SELECT c.oid AS oid, n.nspname AS schema_name, c.relname AS table_name, c.reltuples::bigint AS estimate "
"FROM pg_class c "
"JOIN pg_namespace n ON c.relnamespace = n.oid "
"WHERE c.relname = %1 AND n.nspname = %2"
")" )
.arg( QgsPostgresConn::quotedValue( mTableName ), QgsPostgresConn::quotedValue( mSchemaName ) );
if ( resTableOid.PQntuples() != 1 )
{
return QString();
}
const QString sqlWithPrivilages = QStringLiteral( "privileges AS ("
"SELECT table_info.oid as oid, "
"COALESCE(NULLIF(CONCAT_WS(', ',"
"CASE WHEN has_table_privilege(table_info.oid, 'SELECT') THEN 'SELECT' END,"
"CASE WHEN has_table_privilege(table_info.oid, 'INSERT') THEN 'INSERT' END,"
"CASE WHEN has_table_privilege(table_info.oid, 'UPDATE') THEN 'UPDATE' END,"
"CASE WHEN has_table_privilege(table_info.oid, 'DELETE') THEN 'DELETE' END),"
"''), '') as privileges "
"FROM table_info"
")" );
qlonglong tableOid = resTableOid.PQgetvalue( 0, 0 ).toLongLong();
const QString sqlWithIndexes = QStringLiteral( "table_indexes AS("
"SELECT pi.schemaname AS schema_name, pi.tablename AS table_name, pi.indexname AS index_name "
"FROM pg_indexes pi "
"JOIN table_info ti ON pi.schemaname = ti.schema_name AND pi.tablename = ti.table_name "
"WHERE pi.indexdef LIKE '%USING gist%' "
"),"
"table_indexes_info AS("
"SELECT schema_name, table_name, COALESCE(string_agg(index_name, ', ' ORDER BY index_name), '') as index_names "
"FROM table_indexes "
"GROUP BY schema_name, table_name"
")" );
const QString sqlPrivileges = QStringLiteral( "SELECT "
"has_table_privilege(%1, 'SELECT'), "
"has_table_privilege(%1, 'INSERT'), "
"has_table_privilege(%1, 'UPDATE'), "
"has_table_privilege(%1, 'DELETE')" )
.arg( QgsPostgresConn::quotedValue( tableOid ) );
const QString sqlMainQuery = QStringLiteral( "WITH %1, %2, %3"
"SELECT table_info.oid, table_info.table_name, table_info.schema_name, privileges.privileges, "
"table_info.estimate, table_indexes_info.index_names, pg_description.description "
"FROM table_info "
"LEFT JOIN privileges ON table_info.oid = privileges.oid "
"LEFT JOIN table_indexes_info ON table_indexes_info.table_name = table_info.table_name AND table_indexes_info.schema_name = table_info.schema_name "
"LEFT JOIN pg_description ON pg_description.objoid = table_info.oid" )
.arg( sqlWithTableInfo, sqlWithPrivilages, sqlWithIndexes );
QgsPostgresResult resPrivileges( connectionRO()->LoggedPQexec( "QgsPostgresProvider", sqlPrivileges ) );
QgsPostgresResult resTable( connectionRO()->LoggedPQexec( "QgsPostgresProvider", sqlMainQuery ) );
QStringList privileges;
if ( resPrivileges.PQntuples() > 0 )
{
if ( resPrivileges.PQgetvalue( 0, 0 ) == "t" )
{
privileges.append( "SELECT" );
}
if ( resPrivileges.PQgetvalue( 0, 1 ) == "t" )
{
privileges.append( "INSERT" );
}
if ( resPrivileges.PQgetvalue( 0, 2 ) == "t" )
{
privileges.append( "UPDATE" );
}
if ( resPrivileges.PQgetvalue( 0, 3 ) == "t" )
{
privileges.append( "DELETE" );
}
}
const QString sqlEstimatedRowCount = QStringLiteral( "SELECT "
"reltuples::bigint AS estimate FROM pg_class "
"WHERE oid = %1" )
.arg( QgsPostgresConn::quotedValue( tableOid ) );
QgsPostgresResult resRowCount( connectionRO()->LoggedPQexec( "QgsPostgresProvider", sqlEstimatedRowCount ) );
long long estimateRowCount = -1;
if ( resRowCount.PQntuples() > 0 )
{
estimateRowCount = resRowCount.PQgetvalue( 0, 0 ).toLongLong();
}
const QString sqlSpatialIndex = QStringLiteral( "SELECT * FROM pg_indexes WHERE schemaname = %1 AND tablename = %2 AND indexdef LIKE 'USING %gist%'" )
.arg( QgsPostgresConn::quotedValue( mSchemaName ), QgsPostgresConn::quotedValue( mTableName ) );
QgsPostgresResult resSpatialIndexes( connectionRO()->LoggedPQexec( "QgsPostgresProvider", sqlSpatialIndex ) );
QString spatialIndexText = tr( "No spatial index." );
if ( resSpatialIndexes.PQntuples() > 0 )
{
QStringList spatialIndexes;
for ( int i = 0; i < resSpatialIndexes.PQntuples(); ++i )
{
spatialIndexes.append( resSpatialIndexes.PQgetvalue( i, 2 ) );
}
spatialIndexText = tr( "Spatial index/indices exists (%1)." ).arg( spatialIndexes.join( ", " ) );
}
const QString sqlTableComment = QStringLiteral( "SELECT description FROM pg_description WHERE objoid = %1" )
.arg( QgsPostgresConn::quotedValue( tableOid ) );
QgsPostgresResult resTableComment( connectionRO()->LoggedPQexec( "QgsPostgresProvider", sqlTableComment ) );
QString tableComment;
QString privileges;
QString spatialIndexText = tr( "No spatial index." );
long long estimateRowCount = -1;
if ( resTableComment.PQntuples() > 0 )
if ( resTable.PQntuples() > 0 )
{
tableComment = resTableComment.PQgetvalue( 0, 0 );
tableComment = resTable.PQgetvalue( 0, 6 );
tableComment = tableComment.replace( QStringLiteral( "\n" ), QStringLiteral( "<br>" ) );
estimateRowCount = resTable.PQgetvalue( 0, 4 ).toLongLong();
privileges = resTable.PQgetvalue( 0, 3 );
if ( !resTable.PQgetvalue( 0, 5 ).isEmpty() )
{
spatialIndexText = tr( "Spatial index/indices exists (%1)." ).arg( resTable.PQgetvalue( 0, 5 ) );
}
}
const QVariantMap additionalInformation {
{ tr( "Privileges" ), privileges.join( ", " ) },
{ tr( "Privileges" ), privileges },
{ tr( "Rows (estimation)" ), estimateRowCount },
{ tr( "Spatial Index" ), spatialIndexText },
{ tr( "Table Comment" ), tableComment }