groovy.sql

## Class DataSet

- java.lang.Object
- - groovy.sql.Sql
  - - groovy.sql.DataSet

    public class DataSet
    extends Sql

An enhancement of Groovy's Sql class providing support for accessing and querying databases using POGO fields and operators rather than JDBC-level API calls and RDBMS column names. So, instead of a query like:

     def db = // an instance of groovy.sql.Sql
     def sql = '''select * from Person
         where (purchaseCount > ? and birthMonth = ?)
         and (lastName < ? or lastName > ?)
         and age < ? and age > ? and firstName != ?
         order by firstName DESC, age'''
     def params = [10, "January", "Zulu", "Alpha", 99, 5, "Bert"]
     def sortedPeopleOfInterest = db.rows(sql, params)

You can write code like this:

     def person = new DataSet(db, 'Person') // or db.dataSet('Person'), or db.dataSet(Person)
     def janFrequentBuyers = person.findAll { it.purchaseCount > 10 && it.lastName == "January" }
     def sortedPeopleOfInterest = janFrequentBuyers.
         findAll{ it.lastName < 'Zulu' || it.lastName > 'Alpha' }.
         findAll{ it.age < 99 }.
         findAll{ it.age > 5 }.
         sort{ it.firstName }.reverse().
         findAll{ it.firstName != 'Bert' }.
         sort{ it.age }

Currently, the Groovy source code for any accessed POGO must be on the classpath at runtime. Also, at the moment, the expressions (or nested expressions) can only contain references to fields of the POGO or literals (i.e. constant Strings or numbers). This limitation may be removed in a future version of Groovy.

Author:
  Chris Stevenson, Paul King, James Strachan

### Nested Class Summary

### Nested classes/interfaces inherited from class groovy.sql.Sql

`Sql.AbstractQueryCommand`

### Field Summary

### Fields inherited from class groovy.sql.Sql

`ALL_RESULT_SETS, ARRAY, BIGINT, BINARY, BIT, BLOB, BOOLEAN, CHAR, CLOB, DATALINK, DATE, DECIMAL, DISTINCT, DOUBLE, FIRST_RESULT_SET, FLOAT, INTEGER, JAVA_OBJECT, LOG, LONGVARBINARY, LONGVARCHAR, NO_RESULT_SETS, NULL, NUMERIC, OTHER, REAL, REF, SMALLINT, STRUCT, TIME, TIMESTAMP, TINYINT, VARBINARY, VARCHAR`

### Constructor Summary

Constructors
Constructor and Description
`DataSet(Sql sql, java.lang.Class type)`
`DataSet(Sql sql, java.lang.String table)`

### Method Summary

All Methods Instance Methods Concrete Methods
`void` `add(java.util.Map<java.lang.String,java.lang.Object> map)` Adds the provided map of key-value pairs as a new row in the table represented by this DataSet.
`void` `cacheConnection(Closure closure)` Caches the connection used while the closure is active.
`void` `close()` If this SQL object was created with a Connection then this method closes the connection.
`protected void` `closeResources(java.sql.Connection connection, java.sql.Statement statement)` An extension point allowing the behavior of resource closing to be overridden in derived classes.
`protected void` `closeResources(java.sql.Connection connection, java.sql.Statement statement, java.sql.ResultSet results)` An extension point allowing derived classes to change the behavior of resource closing.
`void` `commit()` If this SQL object was created with a Connection then this method commits the connection.
`protected java.sql.Connection` `createConnection()` An extension point allowing derived classes to change the behavior of connection creation.
`DataSet` `createView(Closure criteria)`
`void` `each(Closure closure)` Calls the provided closure for each of the rows of the table represented by this DataSet.
`void` `each(int offset, int maxRows, Closure closure)` Calls the provided closure for a "page" of rows from the table represented by this DataSet.
`DataSet` `findAll(Closure where)` Return a lazy-implemented filtered view of this DataSet.
`java.lang.Object` `firstRow()` Returns the first row from a DataSet's underlying table
`java.util.List<java.lang.Object>` `getParameters()`
`java.lang.String` `getSql()`
`protected SqlOrderByVisitor` `getSqlOrderByVisitor()`
`protected SqlWhereVisitor` `getSqlWhereVisitor()`
`DataSet` `reverse()` Return a lazy-implemented reverse-ordered view of this DataSet.
`void` `rollback()` If this SQL object was created with a Connection then this method rolls back the connection.
`java.util.List` `rows()` Returns a List of all of the rows from the table a DataSet represents.
`java.util.List` `rows(int offset, int maxRows)` Returns a "page" of the rows from the table a DataSet represents.
`DataSet` `sort(Closure sort)` Return a lazy-implemented re-ordered view of this DataSet.
`int[]` `withBatch(Closure closure)` Performs the closure (containing batch operations) within a batch.
`int[]` `withBatch(int batchSize, Closure closure)` Performs the closure (containing batch operations) within a batch.
`void` `withTransaction(Closure closure)` Performs the closure within a transaction using a cached connection.

### Methods inherited from class groovy.sql.Sql

`ARRAY, asList, asList, asList, asSql, BIGINT, BINARY, BIT, BLOB, BOOLEAN, buildSqlWithIndexedProps, cacheStatements, call, call, call, call, call, call, callWithAllRows, callWithAllRows, callWithRows, callWithRows, callWithRows, CHAR, checkForNamedParams, CLOB, closeResources, configure, createPreparedQueryCommand, createQueryCommand, DATALINK, dataSet, dataSet, DATE, DECIMAL, DISTINCT, DOUBLE, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, eachRow, execute, execute, execute, execute, execute, execute, execute, execute, execute, execute, executeInsert, executeInsert, executeInsert, executeInsert, executeInsert, executeInsert, executeInsert, executeInsert, executeInsert, executeInsert, executePreparedQuery, executeQuery, executeUpdate, executeUpdate, executeUpdate, executeUpdate, executeUpdate, expand, findWhereKeyword, firstRow, firstRow, firstRow, firstRow, firstRow, FLOAT, getConnection, getDataSource, getParameters, getResultSetConcurrency, getResultSetHoldability, getResultSetType, getUpdateCount, getUpdatedParams, in, inout, INTEGER, isCacheNamedQueries, isCacheStatements, isEnableMetaDataChecking, isEnableNamedQueries, isWithinBatch, JAVA_OBJECT, loadDriver, LONGVARBINARY, LONGVARCHAR, newInstance, newInstance, newInstance, newInstance, newInstance, newInstance, newInstance, NULL, nullify, NUMERIC, OTHER, out, preCheckForNamedParams, query, query, query, query, query, REAL, REF, resultSet, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, rows, setCacheNamedQueries, setCacheStatements, setEnableMetaDataChecking, setEnableNamedQueries, setInternalConnection, setObject, setParameters, setResultSetConcurrency, setResultSetHoldability, setResultSetType, SMALLINT, STRUCT, TIME, TIMESTAMP, TINYINT, VARBINARY, VARCHAR, withBatch, withBatch, withInstance, withInstance, withInstance, withInstance, withInstance, withInstance, withInstance, withStatement`

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Constructor Detail

#### DataSet

    public DataSet(Sql sql,
                   java.lang.Class type)

#### DataSet

    public DataSet(Sql sql,
                   java.lang.String table)

### Method Detail

#### createConnection

    protected java.sql.Connection createConnection()
                                            throws java.sql.SQLException

Description copied from class: `Sql`
An extension point allowing derived classes to change the behavior of connection creation. The default behavior is to either use the supplied connection or obtain it from the supplied datasource.

Overrides:
  `createConnection` in class `Sql`
Returns:
  the connection associated with this Sql
Throws:
  `java.sql.SQLException` - if a SQL error occurs

#### closeResources

    protected void closeResources(java.sql.Connection connection,
                                  java.sql.Statement statement,
                                  java.sql.ResultSet results)

Description copied from class: `Sql`
An extension point allowing derived classes to change the behavior of resource closing.

Overrides:
  `closeResources` in class `Sql`
Parameters:
  `connection` - the connection to close
  `statement` - the statement to close
  `results` - the results to close

#### closeResources

    protected void closeResources(java.sql.Connection connection,
                                  java.sql.Statement statement)

Description copied from class: `Sql`
An extension point allowing the behavior of resource closing to be overridden in derived classes.

Overrides:
  `closeResources` in class `Sql`
Parameters:
  `connection` - the connection to close
  `statement` - the statement to close

#### cacheConnection

    public void cacheConnection(Closure closure)
                         throws java.sql.SQLException

Description copied from class: `Sql`
Caches the connection used while the closure is active. If the closure takes a single argument, it will be called with the connection, otherwise it will be called with no arguments.

Overrides:
  `cacheConnection` in class `Sql`
Parameters:
  `closure` - the given closure
Throws:
  `java.sql.SQLException` - if a database error occurs

#### withTransaction

    public void withTransaction(Closure closure)
                         throws java.sql.SQLException

Description copied from class: `Sql`
Performs the closure within a transaction using a cached connection. If the closure takes a single argument, it will be called with the connection, otherwise it will be called with no arguments.

Overrides:
  `withTransaction` in class `Sql`
Parameters:
  `closure` - the given closure
Throws:
  `java.sql.SQLException` - if a database error occurs

#### commit

    public void commit()
                throws java.sql.SQLException

Description copied from class: `Sql`
If this SQL object was created with a Connection then this method commits the connection. If this SQL object was created from a DataSource then this method does nothing.

Overrides:
  `commit` in class `Sql`
Throws:
  `java.sql.SQLException` - if a database access error occurs

#### rollback

    public void rollback()
                  throws java.sql.SQLException

Description copied from class: `Sql`
If this SQL object was created with a Connection then this method rolls back the connection. If this SQL object was created from a DataSource then this method does nothing.

Overrides:
  `rollback` in class `Sql`
Throws:
  `java.sql.SQLException` - if a database access error occurs

#### withBatch

    public int[] withBatch(Closure closure)
                    throws java.sql.SQLException

Performs the closure (containing batch operations) within a batch. Uses a batch size of zero, i.e. no automatic partitioning of batches.

Overrides:
  `withBatch` in class `Sql`
Parameters:
  `closure` - the closure containing batch and optionally other statements
Returns:
  an array of update counts containing one element for each command in the batch. The elements of the array are ordered according to the order in which commands were added to the batch.
Throws:
  `java.sql.SQLException` - if a database access error occurs, or this method is called on a closed `Statement`, or the driver does not support batch statements. Throws `BatchUpdateException` (a subclass of `SQLException`) if one of the commands sent to the database fails to execute properly or attempts to return a result set.
See Also:
  `Sql.withBatch(int, Closure)`

#### withBatch

    public int[] withBatch(int batchSize,
                           Closure closure)
                    throws java.sql.SQLException

Performs the closure (containing batch operations) within a batch. For example:

     dataSet.withBatch(3) {
         add(anint: 1, astring: "Groovy")
         add(anint: 2, astring: "rocks")
         add(anint: 3, astring: "the")
         add(anint: 4, astring: "casbah")
     }

Overrides:
  `withBatch` in class `Sql`
Parameters:
  `batchSize` - partition the batch into batchSize pieces, i.e. after batchSize `addBatch()` invocations, call `executeBatch()` automatically; 0 means manual calls to executeBatch are required
  `closure` - the closure containing batch and optionally other statements
Returns:
  an array of update counts containing one element for each command in the batch. The elements of the array are ordered according to the order in which commands were added to the batch.
Throws:
  `java.sql.SQLException` - if a database access error occurs, or the driver does not support batch statements. Throws `BatchUpdateException` (a subclass of `SQLException`) if one of the commands sent to the database fails to execute properly.
See Also:
  `Sql.withBatch(Closure)`, `BatchingStatementWrapper`, `Statement`

#### add

    public void add(java.util.Map<java.lang.String,java.lang.Object> map)
             throws java.sql.SQLException

Adds the provided map of key-value pairs as a new row in the table represented by this DataSet.

Parameters:
  `map` - the key (column-name), value pairs to add as a new row
Throws:
  `java.sql.SQLException` - if a database error occurs

#### findAll

    public DataSet findAll(Closure where)

Return a lazy-implemented filtered view of this DataSet.

Parameters:
  `where` - the filtering Closure
Returns:
  the view DataSet

#### sort

    public DataSet sort(Closure sort)

Return a lazy-implemented re-ordered view of this DataSet.

Parameters:
  `sort` - the ordering Closure
Returns:
  the view DataSet

#### reverse

    public DataSet reverse()

Return a lazy-implemented reverse-ordered view of this DataSet.

Returns:
  the view DataSet

#### each

    public void each(Closure closure)
              throws java.sql.SQLException

Calls the provided closure for each of the rows of the table represented by this DataSet.

Parameters:
  `closure` - called for each row with a GroovyResultSet
Throws:
  `java.sql.SQLException` - if a database access error occurs
See Also:
  `Sql.eachRow(String, java.util.List, groovy.lang.Closure)`

#### each

    public void each(int offset,
                     int maxRows,
                     Closure closure)
              throws java.sql.SQLException

Calls the provided closure for a "page" of rows from the table represented by this DataSet. A page is defined as starting at a 1-based offset, and containing a maximum number of rows.

Parameters:
  `offset` - the 1-based offset for the first row to be processed
  `maxRows` - the maximum number of rows to be processed
  `closure` - called for each row with a GroovyResultSet
Throws:
  `java.sql.SQLException` - if a database access error occurs
See Also:
  `Sql.eachRow(String, java.util.List, int, int, groovy.lang.Closure)`

#### getSql

    public java.lang.String getSql()

#### getParameters

    public java.util.List<java.lang.Object> getParameters()

#### getSqlWhereVisitor

    protected SqlWhereVisitor getSqlWhereVisitor()

#### getSqlOrderByVisitor

    protected SqlOrderByVisitor getSqlOrderByVisitor()

#### createView

    public DataSet createView(Closure criteria)

#### rows

    public java.util.List rows()
                        throws java.sql.SQLException

Returns a List of all of the rows from the table a DataSet represents.

Returns:
  Returns a list of GroovyRowResult objects from the dataset
Throws:
  `java.sql.SQLException` - if a database error occurs

#### rows

    public java.util.List rows(int offset,
                               int maxRows)
                        throws java.sql.SQLException

Returns a "page" of the rows from the table a DataSet represents. A page is defined as starting at a 1-based offset, and containing a maximum number of rows.

Parameters:
  `offset` - the 1-based offset for the first row to be processed
  `maxRows` - the maximum number of rows to be processed
Returns:
  a list of GroovyRowResult objects from the dataset
Throws:
  `java.sql.SQLException` - if a database error occurs

#### firstRow

    public java.lang.Object firstRow()
                              throws java.sql.SQLException

Returns the first row from a DataSet's underlying table

Returns:
  Returns the first GroovyRowResult object from the dataset
Throws:
  `java.sql.SQLException` - if a database error occurs

#### close

    public void close()

Description copied from class: `Sql`
If this SQL object was created with a Connection then this method closes the connection. If this SQL object was created from a DataSource then this method only frees any cached objects (statements in particular).

Overrides:
  `close` in class `Sql`