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    • org.nutz.dao.impl.link.DoInsertLinkVisitor Maven / Gradle / Ivy

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    Nutz, which is a collections of lightweight frameworks, each of them can be used independently

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    package org.nutz.dao.impl.link;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.nutz.dao.entity.Entity;
import org.nutz.dao.entity.LinkField;
import org.nutz.dao.impl.AbstractLinkVisitor;
import org.nutz.dao.sql.Pojo;
import org.nutz.dao.sql.PojoCallback;
import org.nutz.dao.util.Pojos;
import org.nutz.lang.Each;
import org.nutz.lang.ExitLoop;
import org.nutz.lang.Lang;
import org.nutz.lang.LoopException;

public class DoInsertLinkVisitor extends AbstractLinkVisitor {

	public void visit(final Object obj, final LinkField lnk) {
		final Object value = lnk.getValue(obj);
		if (Lang.length(value) == 0)
			return;

		// 从宿主对象更新关联对象
		opt.add(Pojos.createRun(new PojoCallback() {
			public Object invoke(Connection conn, ResultSet rs, Pojo pojo) throws SQLException {
				lnk.updateLinkedField(obj, value);
				return pojo.getOperatingObject();
			}
		}).setOperatingObject(obj));

		// 为其循环生成插入语句 : holder.getEntityBy 会考虑到集合和数组的情况的
		final Entity en = lnk.getLinkedEntity();
		Lang.each(value, new Each() {
			public void invoke(int i, Object ele, int length) throws ExitLoop, LoopException {
				// 执行插入
				opt.addInsert(en, ele);
				// 更新字段
				opt.add(Pojos.createRun(new PojoCallback() {
					public Object invoke(Connection conn, ResultSet rs, Pojo pojo)
							throws SQLException {
						lnk.saveLinkedField(obj, pojo.getOperatingObject());
						return pojo.getOperatingObject();
					}
				}).setOperatingObject(ele));
			}
		});

	}

}
    
    
    
    

    




    
    
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