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#440: Migrate DB2 virtual schema to its own repository
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| # DB2 SQL Dialect | ||
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| [DB2](https://www.ibm.com/db2/) is an IBM database product. It is a Relational Database Management System (RDBMS). DB2 is extended with the support of Object-Oriented features and non-relational structures with XML. | ||
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| ## Registering the JDBC Driver in EXAOperation | ||
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| First download the [DB2 JDBC driver](http://www-01.ibm.com/support/docview.wss?uid=swg21363866). | ||
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| Now register the driver in EXAOperation: | ||
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| 1. Click "Software" | ||
| 1. Switch to tab "JDBC Drivers" | ||
| 1. Click "Browse..." | ||
| 1. Select JDBC driver file | ||
| 1. Click "Upload" | ||
| 1. Click "Add" | ||
| 1. In dialog "Add EXACluster JDBC driver" configure the JDBC driver (see below) | ||
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| You need to specify the following settings when adding the JDBC driver via EXAOperation. | ||
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| | Parameter | Value | | ||
| |-----------|-----------------------------------------------------| | ||
| | Name | `DB2` | | ||
| | Main | `com.ibm.db2.jcc.DB2Driver` | | ||
| | Prefix | `jdbc:db2:` | | ||
| | Files | `db2jcc4.jar`, `db2jcc_license_cu.jar` | | ||
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| Additionally there are 2 files for the DB2 Driver. | ||
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| * `db2jcc_license_cu.jar` - License File for DB2 on Linux Unix and Windows | ||
| * `db2jcc_license_cisuz.jar` - License File for DB2 on zOS (Mainframe) | ||
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| Make sure that you upload the necessary license file for the target platform you want to connect to. | ||
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| ## Uploading the JDBC Driver to EXAOperation | ||
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| 1. [Create a bucket in BucketFS](https://docs.exasol.com/administration/on-premise/bucketfs/create_new_bucket_in_bucketfs_service.htm) | ||
| 1. Upload the driver and the license to BucketFS | ||
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| This step is necessary since the UDF container the adapter runs in has no access to the JDBC drivers installed via EXAOperation but it can access BucketFS. | ||
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| ## Installing the Adapter Script | ||
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| Upload the latest available release of [Virtual Schema JDBC Adapter](https://github.com/exasol/virtual-schemas/releases) to Bucket FS. | ||
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| Then create a schema to hold the adapter script. | ||
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| ```sql | ||
| CREATE SCHEMA ADAPTER; | ||
| ``` | ||
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| The SQL statement below creates the adapter script, defines the Java class that serves as entry point and tells the UDF framework where to find the libraries (JAR files) for Virtual Schema and database driver. | ||
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| ### For Regular DB2 Servers | ||
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| ```sql | ||
| CREATE OR REPLACE JAVA ADAPTER SCRIPT ADAPTER.JDBC_ADAPTER AS | ||
| %scriptclass com.exasol.adapter.RequestDispatcher; | ||
| %jar /buckets/<BFS service>/<bucket>/virtual-schema-dist-8.0.0-bundle-6.0.0.jar; | ||
| %jar /buckets/<BFS service>/<bucket>/db2jcc4.jar; | ||
| %jar /buckets/<BFS service>/<bucket>/db2jcc_license_cu.jar; | ||
| / | ||
| ; | ||
| ``` | ||
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| ### For Mainframes | ||
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| ```sql | ||
| CREATE OR REPLACE JAVA ADAPTER SCRIPT ADAPTER.JDBC_ADAPTER AS | ||
| %scriptclass com.exasol.adapter.RequestDispatcher; | ||
| %jar /buckets/<BFS service>/<bucket>/virtual-schema-dist-8.0.0-bundle-6.0.0.jar; | ||
| %jar /buckets/<BFS service>/<bucket>/db2jcc4.jar; | ||
| %jar /buckets/<BFS service>/<bucket>/db2jcc_license_cu.jar; | ||
| %jar /buckets/<BFS service>/<bucket>/db2jcc_license_cisuz.jar; | ||
| / | ||
| ``` | ||
| ## Defining a Named Connection | ||
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| Define the connection to DB2 as shown below. | ||
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| ```sql | ||
| CREATE OR REPLACE CONNECTION DB2_CONNECTION | ||
| TO 'jdbc:db2://<host>:<port>/<database name>' | ||
| USER '<user>' | ||
| IDENTIFIED BY '<password>'; | ||
| ``` | ||
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| ## Creating a Virtual Schema | ||
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| Below you see how a DB2 Virtual Schema is created. | ||
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| ```sql | ||
| CREATE VIRTUAL SCHEMA <virtual schema name> | ||
| USING ADAPTER.JDBC_ADAPTER | ||
| WITH | ||
| SQL_DIALECT = 'DB2' | ||
| CONNECTION_NAME = 'DB2_CONNECTION' | ||
| SCHEMA_NAME = '<schema name>' | ||
| ; | ||
| ``` | ||
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| ## Testing information | ||
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| DB2 was tested with the IBM DB2 JCC Drivers that come with DB2 LUW V10.1 and V11. As these drivers didn't have any major changes in the past years any DB2 driver should work (back to V9.1). The driver comes with 2 different implementations `db2jcc.jar` and `db2jcc4.jar`. All tests were made with the `db2jcc4.jar`. | ||
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| ## Supported Capabilities | ||
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| The DB2 dialect handles implements specific casts for time data types and functions. | ||
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| ## Casting of Data Types | ||
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| * `TIMESTAMP` and `TIMESTAMP(x)` is cast to `VARCHAR` to not lose precision. | ||
| * `VARCHAR` and `CHAR` for bit data will be cast to a hex string with double the original size | ||
| * `TIME` will be cast to `VARCHAR(8)` | ||
| * `XML` will be cast to `VARCHAR(DB2_MAX_LENGTH)` | ||
| * `BLOB` is not supported | ||
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| ## Casting of Functions | ||
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| * `LIMIT` will replaced by `FETCH FIRST x ROWS ONLY` | ||
| * `OFFSET` is currently not supported as only DB2 V11 support this natively | ||
| * `ADD_DAYS`, `ADD_WEEKS` ... will be replaced by `COLUMN + DAYS`, `COLUMN + ....` | ||
| The DB2 Virtual Schema has been migrated to its [own repository](https://github.com/exasol/db2-virtual-schema/). |
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src/main/java/com/exasol/adapter/dialects/db2/DB2ColumnMetadataReader.java
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src/main/java/com/exasol/adapter/dialects/db2/DB2MetadataReader.java
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