setGlobalMergeEnabled

void sqlDataManager.setGlobalMergeEnabled ( boolean merge )

This feature is only available for Professional and Enterprise editions of screen-scraper.

Description

Set global merge status. When conflicts exist in data, a merge of true will take the newer values and save them over previous null values.

When merging or updating values in a table, that table must have a Primary Key. When the Primary Key is set to autoincrement, if the value of that key was not set with the addData method the DataManager will create a new row rather than update or merge with an existing row. One solution is to use an SqlDuplicateFilter to set fields that would identify an entry as a duplicate and automatically insert the value of the autoincrement key when data is committed.

By default if the data that you are inserting has the same primary key as data already in the database it will ignore the insert. This behavior can be modified by the dm.setGlobalUpdateEnabled and dm.setGlobalMergeEnabled methods of the DataManager. This allows for four different settings to insert data:

Update	Merge	Resulting Action
false	false	Ignore row on duplicate
true	false	Update only values whose corresponding columns are currently NOT NULL in the database
false	true	Update only values whose corresponding columns are currently NULL in the database
true	true	Update all values to new data

Parameters

merge Whether to turn on global merge or not, as a boolean.

Return Values

Returns void.

Change Log

Version	Description
5.0	Available for professional and enterprise editions.

Examples

Set Global Database Merge

// Import classes
import com.screenscraper.datamanager.*;
import com.screenscraper.datamanager.sql.*;
import org.apache.commons.dbcp.BasicDataSource;

// Set Variables
host = "127.0.0.1:3306";
database = "mydb";
username = "user";
password = "pwrd";
parameters = "autoReconnect=true&useCompression=true";

// Build the BasicDataSource for the database connection
BasicDataSource ds = new BasicDataSource();
ds.setDriverClassName( "com.mysql.jdbc.Driver" );
ds.setUsername( username );
ds.setPassword( password );
ds.setUrl( "jdbc:mysql://" + host + "/" + database + "?" + parameters );

// Get MySQL datamanager
dm = new SqlDataManager( ds, session );

// Build Schemas For all Tables
dm.buildSchemas();

// Set Global Update
dm.setGlobalUpdateEnabled( true );

// Set Global Merge
dm.setGlobalMergeEnabled( true );