From 8efe7ba21a2c76458666fb4c7c9d2c92e6b2cd82 Mon Sep 17 00:00:00 2001
From: Johannes Meier <github.com-jm@dnsspam.de>
Date: Fri, 26 Aug 2016 15:11:04 +0200
Subject: [PATCH] migrating metadata & data from EXASOL to EXASOL

---
 exasol_to_exasol.sql | 79 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 exasol_to_exasol.sql

diff --git a/exasol_to_exasol.sql b/exasol_to_exasol.sql
new file mode 100644
index 0000000..68f0672
--- /dev/null
+++ b/exasol_to_exasol.sql
@@ -0,0 +1,79 @@
+create schema database_migration;
+
+/* 
+    This script will generate create schema, create table and create import statements 
+    to load all needed data from an EXASOL database. Automatic datatype conversion is 
+    applied whenever needed. Feel free to adjust it. 
+*/
+
+create or replace script database_migration.EXASOL_TO_EXASOL(
+  CONNECTION_NAME              -- name of the database connection inside exasol -> e.g. my_exa
+  ,IDENTIFIER_CASE_INSENSITIVE -- true if identifiers should be stored case-insensitiv (will be stored upper_case)
+  ,SCHEMA_FILTER               -- filter for the schemas to generate and load (except EXA_SATISTICS and SYS) -> '%' to load all
+  ,TABLE_FILTER                --filter for the tables to generate and load -> '%' to load all
+) RETURNS TABLE
+AS
+exa_upper_begin=''
+exa_upper_end=''
+if IDENTIFIER_CASE_INSENSITIVE == true then
+	exa_upper_begin='upper('
+	exa_upper_end=')'
+end
+suc, res = pquery([[
+with vv_exa_columns as (
+  select ]]..exa_upper_begin..[[table_schema]]..exa_upper_end..[[ as "exa_table_schema", ]]..exa_upper_begin..[[table_name]]..exa_upper_end..[[ as "exa_table_name", ]]..exa_upper_begin..[[column_name]]..exa_upper_end..[[ as "exa_column_name", exasql.* from  
+		(import from exa at ]]..CONNECTION_NAME..[[ statement 
+			'select table_schema, table_name, column_name, COLUMN_ORDINAL_POSITION ordinal_position, COLUMN_TYPE data_type, column_type, COLUMN_MAXSIZE character_maximum_length, COLUMN_NUM_PREC numeric_precision, COLUMN_NUM_SCALE numeric_scale
+				from EXA_ALL_COLUMNS c join EXA_ALL_TABLES t on t.table_schema = c.column_schema and t.table_name = c.column_table
+				where table_schema not in (''SYS'',''EXA_STATISTICS'')
+				AND table_schema like '']]..SCHEMA_FILTER..[[''
+				AND table_name like '']]..TABLE_FILTER..[[''
+		') as exasql 
+
+  
+)
+,vv_create_schemas as(
+  SELECT 'create schema "' || "exa_table_schema" || '";' as sql_text from vv_exa_columns  group by "exa_table_schema" order by "exa_table_schema"
+)
+,vv_create_tables as (
+  select 'create or replace table "' || "exa_table_schema" || '"."' || "exa_table_name" || '" (' || group_concat('"' || "exa_column_name" || '" ' || data_type	
+	                                                                                                               order by ordinal_position) || ');' as sql_text
+	from vv_exa_columns  group by "exa_table_schema", "exa_table_name"
+	order by "exa_table_schema","exa_table_name"
+)
+, vv_imports as (
+  select 'import into "' || "exa_table_schema" || '"."' || "exa_table_name" || '" from exa at ]]..CONNECTION_NAME..[[ table "' || table_schema||'"."'||table_name||'";'  as sql_text
+	from vv_exa_columns group by "exa_table_schema","exa_table_name", table_schema,table_name
+	order by "exa_table_schema","exa_table_name", table_schema,table_name
+)
+select cast('-- ### SCHEMAS ###' as varchar(2000000)) SQL_TEXT
+union all 
+select * from vv_create_schemas
+UNION ALL
+select cast('-- ### TABLES ###' as varchar(2000000)) SQL_TEXT
+union all
+select * from vv_create_tables
+UNION ALL
+select cast('-- ### IMPORTS ###' as varchar(2000000)) SQL_TEXT
+union all
+select * from vv_imports]],{})
+
+if not suc then
+  error('"'..res.error_message..'" Caught while executing: "'..res.statement_text..'"')
+end
+
+return(res)
+/
+
+-- Create a connection to the your other Exasol database
+create connection SECOND_EXASOL_DB to '192.168.6.11..14:8563' user 'username' identified by 'exasolRocks!';
+
+
+execute script database_migration.EXASOL_TO_EXASOL(
+   'SECOND_EXASOL_DB' -- name of your database connection
+   ,TRUE              -- case sensitivity handling for identifiers -> false: handle them case sensitiv / true: handle them case insensitiv --> recommended: true
+   ,'MY_SCHEMA'       -- schema filter --> '%' to load all schemas except 'information_schema' and 'mysql' and 'performance_schema' / '%publ%' to load all schemas like '%pub%'
+   ,'%'               -- table filter --> '%' to load all tables (
+);
+
+commit;
\ No newline at end of file