/**
 * Copyright 2018-2118 the original author or authors.
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.vci.dbsync.dbimpl;

import com.vci.dbsync.entity.JobItem;
import com.vci.dbsync.filesync.FileSync;
import com.vci.dbsync.log.SyncLog;
import com.vci.dbsync.DBSync;

import java.sql.*;
import java.util.List;

/**
 * @author liuyazhuang
 * @date 2018/9/11 10:24
 * @description SQL Server数据库同步实现
 * @version 1.0.0
 */
public class SQLServerSync extends AbstractDBSync implements DBSync {
    //private Logger logger = Logger.getLogger(SQLServerSync.class);

    @Override
    public long assembleSQL(JobItem jobItem, Connection srcConn, Connection destConn, FileSync fileSync) throws SQLException {
    	
    	String srcSql = jobItem.getSrcSql();
        String fieldStr = jobItem.getDestTableFields();
        String[] fields = jobItem.getDestTableFields().split(",");
        fields = this.trimArrayItem(fields);
        String[] updateFields = jobItem.getDestTableUpdate().split(",");
        updateFields = this.trimArrayItem(updateFields);
        String destTableKey = jobItem.getDestTableKey();
        String destTable = jobItem.getDestTable();
        Statement stat = srcConn.createStatement();
        ResultSet rs = stat.executeQuery(srcSql);
        StringBuffer sql = new StringBuffer();
        long count = 0;
        while (rs.next()) {
        	sql.setLength(0);
        	
            sql.append("if not exists (select ").append(destTableKey).append(" from ").append(destTable).append(" where ").append(destTableKey).append("='").append(rs.getString(destTableKey))
                    .append("')").append("insert into ").append(destTable).append("(").append(fieldStr).append(") values(");
            for (int index = 0; index < fields.length; index++) {
                sql.append("'").append(rs.getString(fields[index])).append(index == (fields.length - 1) ? "'" : "',");
            }
            sql.append(") else update ").append(destTable).append(" set ");
            for (int index = 0; index < updateFields.length; index++) {
                sql.append(updateFields[index]).append("='").append(rs.getString(updateFields[index])).append(index == (updateFields.length - 1) ? "'" : "',");
            }
            sql.append(" where ").append(destTableKey).append("='").append(rs.getString(destTableKey)).append("';");
            
            //lstSQL.add(sql.toString());
            
            count++;
            // this.logger.info("第" + count + "耗时: " + (new Date().getTime() - oneStart) + "ms");
        }
        SyncLog.logger.info("总共查询到 " + count + " 条记录");
        if (rs != null) {
            rs.close();
        }
        if (stat != null) {
            stat.close();
        }
        
        return count;
        //return true;//count > 0 ? new String[] {sql.toString()} : null;
    }

    @Override
    public void executeSQL(List<String> sqls, Connection conn) throws SQLException {
        PreparedStatement pst = conn.prepareStatement(sqls.toString());
        pst.executeUpdate();
        conn.commit();
        pst.close();
    }
}