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## groovy.sql
[Java] Class Sql

    java.lang.Object
      groovy.sql.Sql

    public class Sql
    extends Object

A facade over Java's normal JDBC APIs providing greatly simplified resource management and result set handling. Under the covers the facade hides away details associated with getting connections, constructing and configuring statements, interacting with the connection, closing resources and logging errors. Special features of the facade include using closures to iterate through result sets, a special GString syntax for representing prepared statements and treating result sets like collections of maps with the normal Groovy collection methods available.

#### Typical usage

First you need to set up your sql instance. There are several constructors and a few `newInstance` factory methods available to do this. In simple cases, you can just provide the necessary details to set up a connection (e.g. for hsqldb):

     def db = [url:'jdbc:hsqldb:mem:testDB', user:'sa', password:'', driver:'org.hsqldb.jdbcDriver']
     def sql = Sql.newInstance(db.url, db.user, db.password, db.driver)

or if you have an existing connection (perhaps from a connection pool) or a datasource use one of the constructors:

     def sql = new Sql(datasource)

Now you can invoke sql, e.g. to create a table:

     sql.execute '''
         create table PROJECT (
             id integer not null,
             name varchar(50),
             url varchar(100),
         )
     '''

Or insert a row using JDBC PreparedStatement inspired syntax:

     def params = [10, 'Groovy', 'http://groovy.codehaus.org']
     sql.execute 'insert into PROJECT (id, name, url) values (?, ?, ?)', params

Or insert a row using GString syntax:

     def map = [id:20, name:'Grails', url:'http://grails.codehaus.org']
     sql.execute "insert into PROJECT (id, name, url) values ($map.id, $map.name, $map.url)"

Or a row update:

     def newUrl = 'http://grails.org'
     def project = 'Grails'
     sql.executeUpdate "update PROJECT set url=$newUrl where name=$project"

Now try a query using `eachRow`:

     println 'Some GR8 projects:'
     sql.eachRow('select * from PROJECT') { row ->
         println "${row.name.padRight(10)} ($row.url)"
     }

Which will produce something like this:

     Some GR8 projects:
     Groovy     (http://groovy.codehaus.org)
     Grails     (http://grails.org)
     Griffon    (http://griffon.codehaus.org)
     Gradle     (http://gradle.org)

Now try a query using `rows`:

     def rows = sql.rows("select * from PROJECT where name like 'Gra%'")
     assert rows.size() == 2
     println rows.join('\n')

with output like this:

     [ID:20, NAME:Grails, URL:http://grails.org]
     [ID:40, NAME:Gradle, URL:http://gradle.org]

Finally, we should clean up:

     sql.close()

If we are using a DataSource and we haven't enabled statement caching, then strictly speaking the final `close()` method isn't required - as all connection handling is performed transparently on our behalf; however, it doesn't hurt to have it there as it will return silently in that case.

#### Named and named ordinal parameters

Several of the methods in this class which have a String-based sql query and params in a List