feat: server summary for postgres

plugins/dbgate-plugin-postgres/src/backend/sql/index.js

@@ -17,6 +17,9 @@ const geographyColumns = require('./geographyColumns');
 const proceduresParameters = require('./proceduresParameters');
 const foreignKeys = require('./foreignKeys');
 const triggers = require('./triggers');
+const listDatabases = require('./listDatabases');
+const listVariables = require('./listVariables');
+const listProcesses = require('./listProcesses');
 
 const fk_keyColumnUsage = require('./fk_key_column_usage');
 
@@ -41,4 +44,7 @@ module.exports = {
   geographyColumns,
   proceduresParameters,
   triggers,
+  listDatabases,
+  listVariables,
+  listProcesses,
 };

plugins/dbgate-plugin-postgres/src/backend/sql/listDatabases.js

@@ -0,0 +1,11 @@
+module.exports = `
+SELECT 
+  "datname" AS "name",
+  pg_database_size("datname") AS "sizeOnDisk",
+  0 AS "tableCount",
+  0 AS "viewCount", 
+  0 AS "matviewCount"
+FROM "pg_database" 
+WHERE "datistemplate" = false
+ORDER BY pg_database_size("datname") DESC
+`;

plugins/dbgate-plugin-postgres/src/backend/sql/listProcesses.js

@@ -0,0 +1,13 @@
+module.exports = `
+SELECT 
+  "pid" AS "processId",
+  "application_name" AS "client",
+  "client_addr" AS "connectionId",
+  "state" AS "state",
+  "query" AS "operation",
+  EXTRACT(EPOCH FROM (NOW() - "state_change")) AS "runningTime",
+  "wait_event" IS NOT NULL AS "waitingFor"
+FROM "pg_stat_activity" 
+WHERE "state" IS NOT NULL
+ORDER BY "pid"
+`;

plugins/dbgate-plugin-postgres/src/backend/sql/listVariables.js

@@ -0,0 +1,5 @@
+module.exports = `
+SELECT "name" AS "variable", "setting" AS "value" 
+FROM "pg_settings" 
+ORDER BY "name"
+`;