如何将 excel 文件导入房间 sqlite 数据库并管理冲突？

Question

I want to import an excel file into my database designed with room library on android. I can export the database using a library but for import i need to check items and handle conflicts but I don't know how.

Answer 1

It would be nice to look on the following articles. Article1 and article2 focuses on using room to import csv using room.

If you can use a different library, this is also helpful.

I will advise to break this functionality into two tasks.

1. Extract data from CSV/Excel file
2. Put that data into the database

1 To extract data from CSV/Excel File, you can use the following code.

    CSVReader csvReader = new CSVReader(new FileReader(Environment.getExternalStorageDirectory() + "/" + TableName));
String[] nextLine;
int count = 0;
StringBuilder columns = new StringBuilder();
StringBuilder value = new StringBuilder();
 
while ((nextLine = csvReader.readNext()) != null) {
      // nextLine[] is an array of values from the line
         for (int i = 0; i < nextLine.length - 1; i++) {
             if (count == 0) {
                 if (i == nextLine.length - 2)
                     columns.append(nextLine[i]);
                 else
                     columns.append(nextLine[i]).append(",");
             } else {
                 if (i == nextLine.length - 2)
                    value.append("'").append(nextLine[i]).append("'");
                 else
                    value.append("'").append(nextLine[i]).append("',");
             }
        }

2. To put the extracted data into the database you can use the following code.

Create a raw query function in your DAO.

@RawQuery  
Boolean insertDataRawFormat(SupportSQLiteQuery query);

Using that query put the data into the Database

SimpleSQLiteQuery query = new SimpleSQLiteQuery("Insert INTO " + tableName + " (" + columns + ") " + "values(" + value + ")",
           new Object[]{});
    getDb().cashDrawerDao().insertDataRawFormat(query);