May 17, 2026, 11:40 PM

inbox/DataBase/PostgreSQL/dba_scripts/table_dependents.sh

@@ -0,0 +1,70 @@
+#!/bin/bash
+
+USER=""
+PORT=""
+TBL=""
+
+usage() {
+    echo "Usage: $0 -d <dbname> [-t <table> -p <port> -U <user>]"
+    exit 1
+}
+
+while getopts "d:p:t:U:u" OPT;
+do case "${OPT}" in
+      d) DBNAME=$OPTARG
+	 ;;
+      p) PORT="-p $OPTARG"
+	 ;;
+      t) TBL=$OPTARG
+	 ;;
+      U) USER="-U $OPTARG"
+	 ;;
+      u) usage
+	 ;;
+    [?]) usage
+   esac;
+done
+
+
+if [ "$DBNAME" = "" ]
+  then
+    usage
+fi
+
+getver()
+{
+VER=$(psql $PORT -t $USER $DBNAME <<_QRYVER_
+SELECT version();
+_QRYVER_
+)
+}
+getver
+
+VER=$(echo $VER | cut -c -16)
+echo "Version is $VER"
+
+get_dependents() {
+DEPLIST=$(psql $PORT -q $USER $DBNAME <<_QUERY_
+
+SELECT n.nspname as schema,
+       pa.relname as parent,
+       ch.relname as dependent,
+       cn.conname as constraint_name
+  FROM pg_constraint cn
+  JOIN pg_class pa ON (pa.oid = cn.confrelid)
+  JOIN pg_class ch ON (ch.oid = cn.conrelid)
+  JOIN pg_namespace n ON (n.oid = pa.relnamespace)
+ WHERE pa.relname LIKE '%$TBL%'
+   AND contype = 'f'
+ ORDER BY 1, 2, 3;
+
+_QUERY_
+
+)
+
+}
+
+get_dependents
+echo "${DEPLIST}"
+
+exit 0