org.sqlproc.engine.jdbc
Class JdbcQuery

java.lang.Object
  org.sqlproc.engine.jdbc.JdbcQuery

All Implemented Interfaces:

SqlQuery

public class JdbcQuery
extends Object
implements SqlQuery

The JDBC stack implementation of the SQL Engine query contract. In fact it's an adapter the internal JDBC stuff.

For more info please see the Reference Guide or the tutorials.

Author:

Vladimir Hudec

Field Summary

(package private) Connection	connection The connection to the database.
(package private) Integer	firstResult The first row to retrieve.
(package private) List<String>	identities The collection of all (auto-generated) identities.
(package private) Map<String,IdentitySetter>	identitySetters The collection of all identities setters.
(package private) Map<String,Object>	identityTypes The collection of all identities types.
(package private) org.slf4j.Logger	logger The internal slf4j logger.
(package private) Integer	maxResults The maximum number of rows to retrieve.
(package private) List<String>	parameters The collection of all parameters (input value declarations).
(package private) Map<String,Object>	parameterTypes The collection of all parameters types.
(package private) Map<String,Object>	parameterValues The collection of all parameters values.
(package private) String	queryString The SQL query/statement command.
(package private) List<String>	scalars The collection of all scalars (output values declarations).
(package private) Map<String,Object>	scalarTypes The collection of all scalars types.
(package private) Integer	timeout A timeout for the underlying query.

Constructor Summary

JdbcQuery(Connection connection, String queryString)
Creates a new instance of this adapter.

Method Summary

SqlQuery	addScalar(String columnAlias) Declares a scalar query result, which is an SQL query execution output value.
SqlQuery	addScalar(String columnAlias, Object type) Declares a scalar query result, which is an SQL query execution output value.
protected void	doIdentitySelect(String identityName) Runs the select to obtain the value of auto-generated identity.
int	executeUpdate() Executes the update, delete or insert statement.
Object	getQuery() Returns the internal representation of this query.
protected List	getResults(ResultSet rs) Gets the value of the designated columns as the objects in the Java programming language.
List	list() Returns the query results as a List.
SqlQuery	setFirstResult(int firstResult) Sets the first row to retrieve.
protected int	setLimits(PreparedStatement ps, SqlUtils.LimitType limitType, int ix, boolean afterSql) Sets the limit related parameters.
SqlQuery	setMaxResults(int maxResults) Sets the maximum number of rows to retrieve.
SqlQuery	setParameter(String name, Object val) Binds a value to a named query parameter.
SqlQuery	setParameter(String name, Object val, Object type) Binds a value to a named query parameter.
SqlQuery	setParameterList(String name, Object[] vals) Binds multiple values to a named query parameter.
SqlQuery	setParameterList(String name, Object[] vals, Object type) Binds multiple values to a named query parameter.
protected void	setParameters(PreparedStatement ps, SqlUtils.LimitType limitType) Sets the value of the designated parameters.
SqlQuery	setTimeout(int timeout) Sets a timeout for the underlying query.
Object	uniqueResult() Convenience method to return a single instance that matches the query, or null if the query returns no results.

Methods inherited from class java.lang.Object

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

Field Detail

logger

final org.slf4j.Logger logger

The internal slf4j logger.

connection

Connection connection

The connection to the database. It should be opened.

queryString

String queryString

The SQL query/statement command.

scalars

List<String> scalars

The collection of all scalars (output values declarations).

scalarTypes

Map<String,Object> scalarTypes

The collection of all scalars types.

parameters

List<String> parameters

The collection of all parameters (input value declarations).

parameterValues

Map<String,Object> parameterValues

The collection of all parameters values.

parameterTypes

Map<String,Object> parameterTypes

The collection of all parameters types.

identities

List<String> identities

The collection of all (auto-generated) identities.

identitySetters

Map<String,IdentitySetter> identitySetters

The collection of all identities setters.

identityTypes

Map<String,Object> identityTypes

The collection of all identities types.

timeout

Integer timeout

A timeout for the underlying query.

firstResult

Integer firstResult

The first row to retrieve.

maxResults

Integer maxResults

The maximum number of rows to retrieve.

Constructor Detail

JdbcQuery

public JdbcQuery(Connection connection,
                 String queryString)

Creates a new instance of this adapter.

Parameters:

connection - the connection to the database

queryString - the SQL query/statement command

Method Detail

getQuery

public Object getQuery()

Returns the internal representation of this query. This implementation depends on the stack on top of which the SQL Processor works. It can be for example the Hibernate SQLQuery instance.

Specified by:

getQuery in interface SqlQuery

Returns:

the internal representation of this query

setTimeout

public SqlQuery setTimeout(int timeout)

Sets a timeout for the underlying query.

Specified by:

setTimeout in interface SqlQuery

Parameters:

timeout - the timeout in seconds

Returns:

this instance to enable the methods chaining

setFirstResult

public SqlQuery setFirstResult(int firstResult)

Sets the first row to retrieve. If not set, rows will be retrieved beginning from row 0.

Specified by:

setFirstResult in interface SqlQuery

Parameters:

firstResult - a row number, numbered from 0

Returns:

this instance to enable the methods chaining

setMaxResults

public SqlQuery setMaxResults(int maxResults)

Sets the maximum number of rows to retrieve. If not set, there is no limit to the number of rows retrieved.

Specified by:

setMaxResults in interface SqlQuery

Parameters:

maxResults - the maximum number of rows

Returns:

this instance to enable the methods chaining

list

public List list()
          throws SqlProcessorException

Returns the query results as a List. If the query contains multiple results pre row, the results are returned in an instance of Object[].

Specified by:

list in interface SqlQuery

Returns:

the result list

Throws:

SqlProcessorException - in the case of any problem in ORM or JDBC stack

uniqueResult

public Object uniqueResult()
                    throws SqlProcessorException

Convenience method to return a single instance that matches the query, or null if the query returns no results.

Specified by:

uniqueResult in interface SqlQuery

Returns:

the single result or null

Throws:

SqlProcessorException - in the case of any problem in ORM or JDBC stack

executeUpdate

public int executeUpdate()
                  throws SqlProcessorException

Executes the update, delete or insert statement.

Specified by:

executeUpdate in interface SqlQuery

Returns:

the number of affected rows

Throws:

SqlProcessorException - in the case of any problem in ORM or JDBC stack

doIdentitySelect

protected void doIdentitySelect(String identityName)

Runs the select to obtain the value of auto-generated identity.

Parameters:

identityName - the identity name from the META SQL statement

addScalar

public SqlQuery addScalar(String columnAlias)

Declares a scalar query result, which is an SQL query execution output value.

Specified by:

addScalar in interface SqlQuery

Parameters:

columnAlias - the name of the database column or the alias in the result set

Returns:

this instance to enable the methods chaining

addScalar

public SqlQuery addScalar(String columnAlias,
                          Object type)

Declares a scalar query result, which is an SQL query execution output value.

Specified by:

addScalar in interface SqlQuery

Parameters:

columnAlias - the name of the database column or the alias in the result set

type - the (META) type of the parameter

Returns:

this instance to enable the methods chaining

setParameter

public SqlQuery setParameter(String name,
                             Object val)
                      throws SqlProcessorException

Binds a value to a named query parameter.

Specified by:

setParameter in interface SqlQuery

Parameters:

name - the name of the parameter

val - the not-null parameter value

Returns:

this instance to enable the methods chaining

Throws:

SqlProcessorException - in the case of any problem in ORM or JDBC stack

setParameter

public SqlQuery setParameter(String name,
                             Object val,
                             Object type)
                      throws SqlProcessorException

Binds a value to a named query parameter.

Specified by:

setParameter in interface SqlQuery

Parameters:

name - the name of the parameter

val - the possibly-null parameter value

type - the (META) type of the parameter

Returns:

this instance to enable the methods chaining

Throws:

SqlProcessorException - in the case of any problem in ORM or JDBC stack

setParameterList

public SqlQuery setParameterList(String name,
                                 Object[] vals)
                          throws SqlProcessorException

Binds multiple values to a named query parameter. This is useful for binding a list of values to the query fragment in (:value_list).

Specified by:

setParameterList in interface SqlQuery

Parameters:

name - the name of the parameter

vals - a collection of values

Returns:

this instance to enable the methods chaining

Throws:

SqlProcessorException - in the case of any problem in ORM or JDBC stack

setParameterList

public SqlQuery setParameterList(String name,
                                 Object[] vals,
                                 Object type)
                          throws SqlProcessorException

Binds multiple values to a named query parameter. This is useful for binding a list of values to the query fragment in (:value_list).

Specified by:

setParameterList in interface SqlQuery

Parameters:

name - the name of the parameter

vals - a collection of values

type - the (META) type of the parameter

Returns:

this instance to enable the methods chaining

Throws:

SqlProcessorException - in the case of any problem in ORM or JDBC stack

setParameters

protected void setParameters(PreparedStatement ps,
                             SqlUtils.LimitType limitType)
                      throws SQLException

Sets the value of the designated parameters.

Parameters:

ps - an instance of PreparedStatement

limitType - the limit type to restrict the number of rows in the result set

Throws:

SQLException - if a database access error occurs or this method is called on a closed PreparedStatement

setLimits

protected int setLimits(PreparedStatement ps,
                        SqlUtils.LimitType limitType,
                        int ix,
                        boolean afterSql)
                 throws SQLException

Sets the limit related parameters.

Parameters:

ps - an instance of PreparedStatement

limitType - the limit type to restrict the number of rows in the result set

ix - a column index

afterSql - an indicator it's done after the main SQL statement execution

Returns:

the updated column index

Throws:

SQLException - if a database access error occurs or this method is called on a closed PreparedStatement

getResults

protected List getResults(ResultSet rs)
                   throws SQLException

Gets the value of the designated columns as the objects in the Java programming language.

Parameters:

rs - an instance of ResultSet

Returns:

the result list

Throws:

SQLException - if a database access error occurs or this method is called on a closed ResultSet