Create MergeTwoDB.sh

Adding MySQL two databases merge to new

MySQL/MergeTwoDB.sh

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+#!/bin/bash
+# Author: Gediminas Jančys
+# Website: https://blog.jancys.net
+# User to login to MySQL server
+user="root"
+# Database name containing older data than another
+older_DB="older_DB"
+# Database name containing newer data than another
+newer_DB="current_DB"
+# Merged database name
+merged="merged_DB"
+echo "Exporting database structure"
+# Exporting database structure
+mysqldump -u$user -p --no-data $newer_DB > struct.sql
+# Creating new databse
+echo "Creating $merged database"
+mysql -u$user -p --execute="CREATE DATABASE $merged"
+# Filling in database structure
+echo "Importing $merged structure"
+mysql -u$user -p $merged < struct.sql
+# Getting tables in database
+echo "Getting database table list"
+tables=`mysql -u$user -p $merged --execute="SHOW TABLES;"`
+# Generating SQL to merge older data to new database
+for table in $tables; do
+  if [ $table = "Tables_in_$merged" ]; then
+    # Skipping title entry
+    continue
+  fi
+  # Generating SQL staitment
+  SQL="INSERT IGNORE INTO $merged.$table\nSELECT *\nFROM $older_DB.$table;";
+  # Writting SQL to SQL file
+  echo $SQL >> SQL.sql
+done
+# Generating SQL to merge newer data to new database
+for table in $tables; do
+  if [ $table = "Tables_in_$merged" ]; then
+    # Skipping title entry
+    continue
+  fi
+  # Generating SQL staitment
+  SQL="INSERT IGNORE INTO $merged.$table\nSELECT *\nFROM $newer.$table;";
+  # Writting SQL to SQL file
+  echo $SQL >> SQL.sql
+done
+# Merging data
+echo "Merging data"
+mysql -u$user -p $merged < SQL.sql