Package de.yamass.redg.runtime.jdbc

Class RedGDatabaseUtil

java.lang.Object

de.yamass.redg.runtime.jdbc.RedGDatabaseUtil

public class RedGDatabaseUtil
extends Object

Method Summary

Modifier and Type	Method	Description
static <T> Predicate<T>	distinctByKey(Function<? super T,?> keyExtractor)	Taken from http://stackoverflow.com/a/27872852
static void	insertDataIntoDatabase(List<? extends RedGEntity> gObjects, Connection connection)
static void	insertDataIntoDatabase(List<? extends RedGEntity> gObjects, Connection connection, PreparedStatementParameterSetter preparedStatementParameterSetter)	Inserts all data previously prepared by RedG into the database the Connection connects to.

Methods inherited from class java.lang.Object

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

Method Details

insertDataIntoDatabase

public static void insertDataIntoDatabase(List<? extends RedGEntity> gObjects,
 Connection connection)

Parameters:

connection - The JDBC connection

gObjects - The entities to insert

See Also:

• insertDataIntoDatabase(List, Connection, PreparedStatementParameterSetter)

insertDataIntoDatabase

public static void insertDataIntoDatabase(List<? extends RedGEntity> gObjects,
 Connection connection,
 PreparedStatementParameterSetter preparedStatementParameterSetter)

Inserts all data previously prepared by RedG into the database the Connection connects to. Entities are going to be inserted in the order they were added.
This method uses prepared statements to efficiently insert even great amount of data.
If a Insertion/Update updates more than 1 entry, a warning will be logged to the console. If a entity that is marked as "existing" (via redG.existingX()) is not found, an error will be logged and an ExistingEntryMissingException will be thrown.

Parameters:

connection - The database connection

gObjects - The entities that should be inserted into the database

preparedStatementParameterSetter - The prepared statement parameter setter that should be used to set the values on the prepared statements

Throws:

ExistingEntryMissingException - When an entry defined as "existing" (via redG.existingX()) cannot be found in the database

InsertionFailedException - When problems with the prepared statement occur. This is often the result of a faulty data type mapping or PreparedStatementParameterSetter

distinctByKey

public static <T> Predicate<T> distinctByKey(Function<? super T,?> keyExtractor)

Taken from http://stackoverflow.com/a/27872852

Type Parameters:

T - the generic type

Parameters:

keyExtractor - The key extractor function

Returns:

a predicate for filtering