package com.fr.data;

import com.fr.log.FineLoggerFactory;
import com.fr.stable.ParameterProvider;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

/**
 * 带参数的程序数据集Demo 跟ParamTableDataDemo功能一样，但实现更简单
 *
 * @author fanruan
 */
public class SimpleParamTableDataDemo extends SimpleTableData {

    @Override
    public String[] initColumnNames() {
        String[] columnNames = new String[10];
        for (int i = 0; i < 10; i++) {
            columnNames[i] = "column#" + i;
        }
        return columnNames;
    }

    @Override
    public List<Object[]> loadData() {
        // 保存得到的数据库表名
        String tableName = ((ParameterProvider) (parameters.get().toArray())[0]).getValue().toString();

        // 构造SQL语句,并打印出来
        String sql = "select * from " + tableName;
        FineLoggerFactory.getLogger().info("Query SQL of ParamTableDataDemo: \n" + sql);
        // 保存得到的结果集
        ArrayList<Object[]> valueList = new ArrayList();
        Connection con = null;
        try {
            con = getConnection();
            Statement stmt = con.createStatement();
            ResultSet rs = stmt.executeQuery(sql);
            // 获得记录的详细信息，然后获得总列数
            ResultSetMetaData rsmd = rs.getMetaData();
            int colNum = rsmd.getColumnCount();
            // 用对象保存数据
            Object[] objArray = null;
            while (rs.next()) {
                objArray = new Object[colNum];
                for (int i = 0; i < colNum; i++) {
                    objArray[i] = rs.getObject(i + 1);
                }
                // 在valueList中加入这一行数据
                valueList.add(objArray);
            }
            // 释放数据库资源
            rs.close();
            stmt.close();
        } catch (Exception e) {
            FineLoggerFactory.getLogger().error(e.getMessage(), e);
        } finally {
            try {
                if (con != null) {
                    con.close();
                }
            } catch (SQLException e) {
                FineLoggerFactory.getLogger().error(e.getMessage(), e);
            }
        }
        return valueList;
    }
    /**
     * 获取数据库连接 driverName和 url 可以换成您需要的
     *
     * @return Connection
     */
    private Connection getConnection() {

        String driverName = "org.sqlite.JDBC";
        String url = "jdbc:sqlite:////Applications//FineReport10_325//webapps//webroot//help//FRDemo.db";
        String username = "";
        String password = "";
        Connection con;
        try {
            Class.forName(driverName);
            con = DriverManager.getConnection(url, username, password);

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return con;
    }
}