package org.nutz.dao.impl.sql.pojo;
import org.nutz.dao.Chain;
import org.nutz.dao.entity.Entity;
import org.nutz.dao.jdbc.ValueAdaptor;
import org.nutz.lang.Lang;
public class InsertByChainPItem extends AbstractPItem {
private String[] names;
private Object[] values;
public InsertByChainPItem(Chain chain) {
names = new String[chain.size()];
values = new Object[chain.size()];
// 将值链所有内容 copy 到两个数组中去，以便之后遍历
Chain c = chain.head();
int i = 0;
while (null != c) {
names[i] = c.name();
values[i] = c.value();
i++;
c = c.next();
}
if (i == 0)
throw Lang.makeThrow("Insert empty chain!");
}
public void joinSql(Entity<?> en, StringBuilder sb) {
// 字段名部分
sb.append(" (").append(_colname(en, 0));
for (int i = 1; i < names.length; i++) {
sb.append(',').append(_colname(en, i));
}
sb.append(") VALUES(?");
// 占位符部分
for (int i = 1; i < names.length; i++) {
sb.append(",?");
}
sb.append(')');
}
public int joinAdaptor(Entity<?> en, ValueAdaptor[] adaptors, int off) {
for (int i = 0; i < names.length; i++)
adaptors[off++] = en.getColumn(_colname(en, i)).getAdaptor();
return off;
}
public int joinParams(Entity<?> en, Object obj, Object[] params, int off) {
for (int i = 0; i < values.length; i++)
params[off++] = values[i];
return off;
}
public int paramCount(Entity<?> en) {
return values.length;
}
private String _colname(Entity<?> en, int index) {
return en.getField(names[index]).getColumnName();
}
}