SQL Task

## Sql

### Description

Executes a series of SQL statements via JDBC to a database. Statements can either be read in from a text file using the src attribute or from between the enclosing SQL tags.

Multiple statements can be provided, separated by semicolons (or the defined delimiter). Individual lines within the statements can be commented using either --, // or REM at the start of the line.

The autocommit attribute specifies whether auto-commit should be turned on or off whilst executing the statements. If auto-commit is turned on each statement will be executed and committed. If it is turned off the statements will all be executed as one transaction.

The onerror attribute specifies how to proceed when an error occurs during the execution of one of the statements. The possible values are: continue execution, only show the error; stop execution and commit transaction; and abort execution and transaction and fail task.

### Parameters

Attribute | Description | Required
driver | Class name of the jdbc driver | Yes
url | Database connection url | Yes
userid | Database user name | Yes
password | Database password | Yes
src | File containing SQL statements | Yes, unless statements enclosed within tags
encoding | The encoding of the files containing SQL statements | No - defaults to default JVM encoding
delimiter | String that separates SQL statements | No, default ";"
autocommit | Auto commit flag for database connection (default false) | No, default "false"
print | Print result sets from the statements (default false) | No, default "false"
showheaders | Print headers for result sets from the statements (default true) | No, default "true"
output | Output file for result sets (defaults to System.out) | No (print to System.out by default)
append | whether output should be appended to or overwrite an existing file. Defaults to false. | No
classpath | Classpath used to load driver | No (use system classpath)
classpathref | The classpath to use, given as a reference to a path defined elsewhere. | No (use system classpath)
onerror | Action to perform when statement fails: continue, stop, abort | No, default "abort"
rdbms | Execute task only if this rdbms | No (no restriction)
version | Execute task only if rdbms version match | No (no restriction)
caching | Should the task cache loaders and the driver? | No (default=true)

### Parameters specified as nested elements

#### transaction

Use nested `<transaction>` elements to specify multiple blocks of commands to the executed executed in the same connection but different transactions. This is particularly useful when there are multiple files to execute on the same schema.

Attribute | Description | Required
src | File containing SQL statements | Yes, unless statements enclosed within tags

#### fileset

You can specify multiple source files via nested fileset elements. Each file of the fileset will be run in a transaction of its own, the order by which the files of a single fileset will be executed is not defined.

#### classpath

`Sql`'s classpath attribute is a PATH like structure and can also be set via a nested classpath element. It is used to load the JDBC classes.

The

### Examples

>     <sql
>         driver="org.database.jdbcDriver"
>         url="jdbc:database-url"
>         userid="sa"
>         password="pass"
>         src="data.sql"
>     />

Connects to the database given in url as the sa user using the org.database.jdbcDriver and executes the SQL statements contained within the file data.sql

>     <sql
>         driver="org.database.jdbcDriver"
>         url="jdbc:database-url"
>         userid="sa"
>         password="pass"
>         >
>     insert
>     into table some_table
>     values(1,2,3,4);

>     truncate table some_other_table;
>     </sql>

Connects to the database given in url as the sa user using the org.database.jdbcDriver and executes the two SQL statements inserting data into some_table and truncating some_other_table

Note that you may want to enclose your statements in `<![CDATA[` ... `]]>` sections so you don't need to escape `<`, `>` `&` or other special characters. For example:

>     <sql
>         driver="org.database.jdbcDriver"
>         url="jdbc:database-url"
>         userid="sa"
>         password="pass"
>         ><![CDATA[

>     update some_table set column1 = column1 + 1 where column2 < 42;

>     ]]></sql>

The following connects to the database given in url as the sa user using the org.database.jdbcDriver and executes the SQL statements contained within the files data1.sql, data2.sql and data3.sql and then executes the truncate operation on some_other_table.

>     <sql
>         driver="org.database.jdbcDriver"
>         url="jdbc:database-url"
>         userid="sa"
>         password="pass" >
>       <transaction  src="data1.sql"/>
>       <transaction  src="data2.sql"/>
>       <transaction  src="data3.sql"/>
>       <transaction>
>         truncate table some_other_table;
>       </transaction>
>     </sql>

The following example does the same as (and may execute additional SQL files if there are more files matching the pattern `data*.sql`) but doesn't guarantee that data1.sql will be run before `data2.sql`.

>     <sql
>         driver="org.database.jdbcDriver"
>         url="jdbc:database-url"
>         userid="sa"
>         password="pass">
>       <fileset dir=".">
>         <include name="data*.sql"/>
>       </fileset>
>       <transaction>
>         truncate table some_other_table;
>       </transaction>
>     </sql>

The following connects to the database given in url as the sa user using the org.database.jdbcDriver and executes the SQL statements contained within the file data.sql, with output piped to outputfile.txt, searching /some/jdbc.jar as well as the system classpath for the driver class.

>     <sql
>         driver="org.database.jdbcDriver"
>         url="jdbc:database-url"
>         userid="sa"
>         password="pass"
>         src="data.sql"
>         print="yes"
>         output="outputfile.txt"
>         >
>     <classpath>
>     	<pathelement location="/some/jdbc.jar"/>
>     </classpath>
>     </sql>

The following will only execute if the RDBMS is "oracle" and the version starts with "8.1."

>     <sql
>         driver="org.database.jdbcDriver"
>         url="jdbc:database-url"
>         userid="sa"
>         password="pass"
>         src="data.sql"
>         rdbms="oracle"
>         version="8.1."
>         >
>     insert
>     into table some_table
>     values(1,2,3,4);

>     truncate table some_other_table;
>     </sql>

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