UpdateFieldsByChainPItem.java

package org.nutz.dao.impl.sql.pojo;

import org.nutz.dao.Chain;
import org.nutz.dao.entity.Entity;
import org.nutz.dao.entity.MappingField;
import org.nutz.dao.jdbc.Jdbcs;
import org.nutz.dao.jdbc.ValueAdaptor;
import org.nutz.lang.Lang;

public class UpdateFieldsByChainPItem extends AbstractPItem {

    private static final long serialVersionUID = 1L;

    private Chain chain;

    public UpdateFieldsByChainPItem(Chain chain) {
        this.chain = chain;
    }

    public void joinSql(Entity<?> en, StringBuilder sb) {
        if (chain.size() > 0) {
            sb.append(" SET ");
            Chain c = chain.head();
            while (c != null) {
                sb.append(this._fmtcolnm(en, c.name())).append('=');
                if (c.special()) {
                    Chain head = c;
                    if (head.value() != null && head.value() instanceof String) {
                        String str = (String) head.value();
                        if (str.length() > 0) {
                            switch (str.charAt(0)) {
                            case '+':
                            case '-':
                            case '*':
                            case '/':
                            case '%':
                            case '&':
                            case '^':
                            case '|':
                                sb.append(this._fmtcolnm(en, c.name()));
                                break;
                            }
                        }
                    }
                    sb.append(head.value());
                } else {
                    sb.append("?");
                }
                sb.append(',');
                c = c.next();
            }
            sb.deleteCharAt(sb.length() - 1);
            sb.append(' ');
        } else {
            throw Lang.makeThrow("Entity chain for UPDATE '%s'", en.getType().getName());
        }
    }

    public int joinAdaptor(Entity<?> en, ValueAdaptor[] adaptors, int off) {
        Chain c = chain.head();
        while (c != null) {
            if (!c.special()) {
                MappingField mf = en.getField(c.name());
                // TODO 移除这种数组下标用++的写法!!!
                if (c.adaptor() == null)
                    adaptors[off++] = (null == mf ? Jdbcs.getAdaptorBy(c.value()) : mf.getAdaptor());
                else
                    adaptors[off++] = c.adaptor();
            }
            c = c.next();
        }
        return off;
    }

    public int joinParams(Entity<?> en, Object obj, Object[] params, int off) {
        Chain c = chain.head();
        while (c != null) {
            if (!c.special())
                params[off++] = c.value();
            c = c.next();
        }
        return off;
    }

    public int paramCount(Entity<?> en) {
        int count = 0;
        Chain c = chain.head();
        while (c != null) {
            if (!c.special())
                count++;
            c = c.next();
        }
        return count;
    }

}