动态建表并插入数据

Service层根据解析到的数据在Mysql数据库中动态建表并插入数据

以Easy Excel解析得到的文件为例

@Slf4j
@Service
public class ExcelImportServiceImpl implements ExcelImportService {

@Autowired
private ExcelImportDao dao;
@Value("${source.url}")
private String DB_URL;
@Value("${source.name}")
private String USER;
@Value("${source.pwd}")
private String PASS;

//filePath:文件存储绝对路径,tableName:创建的表名
@Override
public Result importExcel(String filePath,String tableName) {

    // 首先创建一个ExcelImportUtilOne的实例，用于处理Excel文件的导入相关操作
    ExcelImportUtilOne excelImportUtil = new ExcelImportUtilOne(filePath);
    // 如果ExcelImportUtilOne实例获取的结果为0，表示可能在读取Excel文件等前期操作中有问题，直接返回0表示导入失败
    if(excelImportUtil.getResult()==0)
        return Result.error();

    //表数据
    List<Map<String, String>> dataList = excelImportUtil.getDataList();
    //表字段
    String[] columns = excelImportUtil.getColumns();

    //动态建表外部方法
    dynamicCreatTable(tableName,columns);
    
    ArrayList<String> fieldList = new ArrayList<>(Arrays.asList(columns));
    //动态插入数据
    dao.dynamicSave(tableName,fieldList,dataList);

    return Result.ok();

}

//动态建表方法
    private void dynamicCreatTable(String tableName,String[] columns){

        StringBuilder sql = new StringBuilder("CREATE TABLE ");
        sql.append(tableName).append(" (");
        sql.append("id BIGINT PRIMARY KEY AUTO_INCREMENT,");

        for (int i = 0; i < columns.length; i++) {
            sql.append(columns[i]).append(" VARCHAR(255)");
            if (i < columns.length - 1) {
                sql.append(", ");
            }
        }
        sql.append(");");
        String statement = sql.toString();

        // 创建Connection对象
        // JDBC连接参数
        String url = DB_URL;
        String username = USER;
        String password = PASS;
        try (Connection connection = DriverManager.getConnection(url, username, password)) {
            // 创建Statement对象
//            Statement psStatement = connection.createStatement();
            PreparedStatement psStatement = connection.prepareStatement(statement, ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);

            // 在此处执行更新SQL语句
            psStatement.executeUpdate();

            // 关闭Statement
//            resultSet.close();
            psStatement.close();
        } catch (SQLException e) {
            log.error("建表失败", e);
        }
    }
}

Mapper层

@Mapper
public interface ExcelImportDao {

    //动态插入数据
    void dynamicSave(String tableName, ArrayList<String> fieldList, List<Map<String, String>> dataList);
}

xml文件

<mapper namespace="net.srt.system.dao.ExcelImportDao">

    <insert id="dynamicSave">
        INSERT INTO ${tableName}(
        <foreach collection="fieldList" item="fieldEach" separator=",">
            ${fieldEach}
        </foreach>
        ) VALUES
        <foreach collection="dataList" item="dataEach" separator=",">
            (
            <foreach collection="fieldList" item="fieldEach" separator=",">
                #{dataEach.${fieldEach}}
            </foreach>
            )
        </foreach>
    </insert>
</mapper>