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    • online.sanen.cdm.template.GeneratedKeyHolder Maven / Gradle / Ivy

    package online.sanen.cdm.template;

import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

/**
 * Default implementation of the {@link KeyHolder} interface, to be used for
 * holding auto-generated keys (as potentially returned by JDBC insert statements).
 *
 * 
    Create an instance of this class for each insert operation, and pass
 * it to the corresponding {@link SqlTemplate}
 * @author LazyToShow	
    
 * Date:	2018年10月15日	
    
 * Time:	下午4:36:59
 */
public class GeneratedKeyHolder implements KeyHolder {

	private final List> keyList;


	/**
	 * Create a new GeneratedKeyHolder with a default list.
	 */
	public GeneratedKeyHolder() {
		this.keyList = new LinkedList>();
	}

	/**
	 * Create a new GeneratedKeyHolder with a given list.
	 * @param keyList a list to hold maps of keys
	 */
	public GeneratedKeyHolder(List> keyList) {
		this.keyList = keyList;
	}


	public Number getKey() throws InvalidDataAccessApiUsageException, DataRetrievalFailureException {
		if (this.keyList.size() == 0) {
			return null;
		}
		if (this.keyList.size() > 1 || this.keyList.get(0).size() > 1) {
			throw new InvalidDataAccessApiUsageException(
					"The getKey method should only be used when a single key is returned.  " +
					"The current key entry contains multiple keys: " + this.keyList);
		}
		Iterator keyIter = this.keyList.get(0).values().iterator();
		if (keyIter.hasNext()) {
			Object key = keyIter.next();
			if (!(key instanceof Number)) {
				throw new DataRetrievalFailureException(
						"The generated key is not of a supported numeric type. " +
						"Unable to cast [" + (key != null ? key.getClass().getName() : null) +
						"] to [" + Number.class.getName() + "]");
			}
			return (Number) key;
		}
		else {
			throw new DataRetrievalFailureException("Unable to retrieve the generated key. " +
					"Check that the table has an identity column enabled.");
		}
	}

	public Map getKeys() throws InvalidDataAccessApiUsageException {
		if (this.keyList.size() == 0) {
			return null;
		}
		if (this.keyList.size() > 1)
			throw new InvalidDataAccessApiUsageException(
					"The getKeys method should only be used when keys for a single row are returned.  " +
					"The current key list contains keys for multiple rows: " + this.keyList);
		return this.keyList.get(0);
	}

	public List> getKeyList() {
		return this.keyList;
	}

}

    
    
    
    

    




    
    
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