cn.xdf.thinkutils.db2.util.sql.UpdateSqlBuilder.java Source code

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Here is the source code for cn.xdf.thinkutils.db2.util.sql.UpdateSqlBuilder.java

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/*
 * Copyright (C) 2013  WhiteCat  (www.thinkandroid.cn)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.xdf.thinkutils.db2.util.sql;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;

import org.apache.http.NameValuePair;

import cn.xdf.thinkutils.db2.annotation.PrimaryKey;
import cn.xdf.thinkutils.db2.entity.ArrayListEx;
import cn.xdf.thinkutils.db2.util.DBUtils;
import cn.xdf.thinkutils.exception.DBException;
import cn.xdf.thinkutils.util.file.StringUtils;

/**
 * @Title TASqlBuilder
 * @Package com.ta.util.db.util.sql
 * @Description sql?
 * @author 
 * @date 2013-1-20
 * @version V1.0
 */
public class UpdateSqlBuilder extends SqlBuilder {

    @Override
    public void onPreGetStatement() throws DBException, IllegalArgumentException, IllegalAccessException {
        // TODO Auto-generated method stub
        if (getUpdateFields() == null) {
            setUpdateFields(getFieldsAndValue(entity));
        }
        super.onPreGetStatement();
    }

    @Override
    public String buildSql() throws DBException, IllegalArgumentException, IllegalAccessException {
        // TODO Auto-generated method stub
        StringBuilder stringBuilder = new StringBuilder(256);
        stringBuilder.append("UPDATE ");
        stringBuilder.append(tableName).append(" SET ");

        ArrayListEx needUpdate = getUpdateFields();
        for (int i = 0; i < needUpdate.size(); i++) {
            NameValuePair nameValuePair = needUpdate.get(i);
            stringBuilder.append(nameValuePair.getName()).append(" = ")
                    .append(StringUtils.isNumeric(nameValuePair.getValue().toString()) ? nameValuePair.getValue()
                            : "'" + nameValuePair.getValue() + "'");
            if (i + 1 < needUpdate.size()) {
                stringBuilder.append(", ");
            }
        }
        if (!StringUtils.isEmpty(this.where)) {
            stringBuilder.append(buildConditionString());
        } else {
            stringBuilder.append(buildWhere(buildWhere(this.entity)));
        }
        return stringBuilder.toString();
    }

    /**
     * Where?
     * 
     * @param entity
     * @return
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws DBException
     */
    public ArrayListEx buildWhere(Object entity)
            throws IllegalArgumentException, IllegalAccessException, DBException {
        Class<?> clazz = entity.getClass();
        ArrayListEx whereArrayList = new ArrayListEx();
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            field.setAccessible(true);
            if (!DBUtils.isTransient(field)) {
                if (DBUtils.isBaseDateType(field)) {
                    Annotation annotation = field.getAnnotation(PrimaryKey.class);
                    if (annotation != null) {
                        String columnName = DBUtils.getColumnByField(field);
                        whereArrayList.add(
                                (columnName != null && !columnName.equals("")) ? columnName : field.getName(),
                                field.get(entity).toString());
                    }

                }
            }
        }
        if (whereArrayList.isEmpty()) {
            throw new DBException("?Where??");
        }
        return whereArrayList;
    }

    /**
     * ,?
     * 
     * @return
     * @throws DBException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     */
    public static ArrayListEx getFieldsAndValue(Object entity)
            throws DBException, IllegalArgumentException, IllegalAccessException {
        // TODO Auto-generated method stub
        ArrayListEx arrayList = new ArrayListEx();
        if (entity == null) {
            throw new DBException("?");
        }
        Class<?> clazz = entity.getClass();
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {

            if (!DBUtils.isTransient(field)) {
                if (DBUtils.isBaseDateType(field)) {
                    PrimaryKey annotation = field.getAnnotation(PrimaryKey.class);
                    if (annotation == null || !annotation.autoIncrement()) {
                        String columnName = DBUtils.getColumnByField(field);
                        field.setAccessible(true);
                        arrayList.add((columnName != null && !columnName.equals("")) ? columnName : field.getName(),
                                field.get(entity) == null ? null : field.get(entity).toString());
                    }
                }
            }
        }
        return arrayList;
    }
}