Import CSV file into SQL Server

问题

I am looking for help to import a .csv file into SQL Server using BULK INSERT and I have few basic questions.

Issues:

The CSV file data may have , (comma) in between (Ex: description), so how can I make import handling these data?
If the client creates the CSV from Excel then the data that have comma are enclosed within "" (double quotes) [as the below example] so how do the import can handle this?
How do we track if some rows have bad data, which import skips? (does import skips rows that are not importable)

Here is the sample CSV with header:

Name,Class,Subject,ExamDate,Mark,Description
Prabhat,4,Math,2/10/2013,25,Test data for prabhat.
Murari,5,Science,2/11/2013,24,"Test data for his's test, where we can test 2nd ROW, Test."
sanjay,4,Science,,25,Test Only.

And SQL statement to import:

BULK INSERT SchoolsTemp
FROM 'C:\CSVData\Schools.csv'
WITH
(
    FIRSTROW = 2,
    FIELDTERMINATOR = ',',  --CSV field delimiter
    ROWTERMINATOR = '\n',   --Use to shift the control to next row
    TABLOCK
)

回答1:

Based SQL Server CSV Import

1) The CSV file data may have , (comma) in between (Ex: description), so how can I make import handling these data?

Solution

If you're using , (comma) as a delimiter, then there is no way to differentiate between a comma as a field terminator and a comma in your data. I would use a different FIELDTERMINATOR like ||. Code would look like and this will handle comma and single slash perfectly.

2) If the client create the csv from excel then the data that have comma are enclosed within " ... " (double quotes) [as the below example] so how do the import can handle this?

Solution

If you're using BULK insert then there is no way to handle double quotes, data will be inserted with double quotes into rows. after inserting the data into table you could replace those double quotes with ''.

update table
set columnhavingdoublequotes = replace(columnhavingdoublequotes,'"','')

3) How do we track if some rows have bad data, which import skips? (does import skips rows that are not importable)?

Solution

To handle rows which aren't loaded into table because of invalid data or format, could be handle using ERRORFILE property, specify the error file name, it will write the rows having error to error file. code should look like.

BULK INSERT SchoolsTemp
    FROM 'C:\CSVData\Schools.csv'
    WITH
    (
    FIRSTROW = 2,
    FIELDTERMINATOR = ',',  --CSV field delimiter
    ROWTERMINATOR = '\n',   --Use to shift the control to next row
    ERRORFILE = 'C:\CSVDATA\SchoolsErrorRows.csv',
    TABLOCK
    )

回答2:

You first need to create a table in your database in which you will be importing the CSV file. After the table is created, follow the steps below.

• Log into your database using SQL Server Management Studio

• Right click on your database and select Tasks -> Import Data...

• Click the Next > button

• For the Data Source, select Flat File Source. Then use the Browse button to select the CSV file. Spend some time configuring how you want the data to be imported before clicking on the Next > button.

• For the Destination, select the correct database provider (e.g. for SQL Server 2012, you can use SQL Server Native Client 11.0). Enter the Server name. Check the Use SQL Server Authentication radio button. Enter the User name, Password, and Database before clicking on the Next > button.

• On the Select Source Tables and Views window, you can Edit Mappings before clicking on the Next > button.

• Check the Run immediately check box and click on the Next > button.

• Click on the Finish button to run the package.

The above was found on this website (I have used it and tested):

回答3:

2) If the client create the csv from excel then the data that have comma are enclosed within " ... " (double quotes) [as the below example] so how do the import can handle this?

You should use FORMAT = 'CSV', FIELDQUOTE = '"' options:

BULK INSERT SchoolsTemp
FROM 'C:\CSVData\Schools.csv'
WITH
(
    FORMAT = 'CSV', 
    FIELDQUOTE = '"',
    FIRSTROW = 2,
    FIELDTERMINATOR = ',',  --CSV field delimiter
    ROWTERMINATOR = '\n',   --Use to shift the control to next row
    TABLOCK
)

回答4:

The best, quickest and easiest way to resolve the comma in data issue is to use Excel to save a comma separated file after having set Windows' list separator setting to something other than a comma (such as a pipe). This will then generate a pipe (or whatever) separated file for you that you can then import. This is described here.

回答5:

Firs you need to import CSV file into Data Table

Then you can insert bulk rows using SQLBulkCopy

using System;
using System.Data;
using System.Data.SqlClient;

namespace SqlBulkInsertExample
{
    class Program
    {
      static void Main(string[] args)
        {
            DataTable prodSalesData = new DataTable("ProductSalesData");

            // Create Column 1: SaleDate
            DataColumn dateColumn = new DataColumn();
            dateColumn.DataType = Type.GetType("System.DateTime");
            dateColumn.ColumnName = "SaleDate";

            // Create Column 2: ProductName
            DataColumn productNameColumn = new DataColumn();
            productNameColumn.ColumnName = "ProductName";

            // Create Column 3: TotalSales
            DataColumn totalSalesColumn = new DataColumn();
            totalSalesColumn.DataType = Type.GetType("System.Int32");
            totalSalesColumn.ColumnName = "TotalSales";

            // Add the columns to the ProductSalesData DataTable
            prodSalesData.Columns.Add(dateColumn);
            prodSalesData.Columns.Add(productNameColumn);
            prodSalesData.Columns.Add(totalSalesColumn);

            // Let's populate the datatable with our stats.
            // You can add as many rows as you want here!

            // Create a new row
            DataRow dailyProductSalesRow = prodSalesData.NewRow();
            dailyProductSalesRow["SaleDate"] = DateTime.Now.Date;
            dailyProductSalesRow["ProductName"] = "Nike";
            dailyProductSalesRow["TotalSales"] = 10;

            // Add the row to the ProductSalesData DataTable
            prodSalesData.Rows.Add(dailyProductSalesRow);

            // Copy the DataTable to SQL Server using SqlBulkCopy
            using (SqlConnection dbConnection = new SqlConnection("Data Source=ProductHost;Initial Catalog=dbProduct;Integrated Security=SSPI;Connection Timeout=60;Min Pool Size=2;Max Pool Size=20;"))
            {
                dbConnection.Open();
                using (SqlBulkCopy s = new SqlBulkCopy(dbConnection))
                {
                    s.DestinationTableName = prodSalesData.TableName;

                    foreach (var column in prodSalesData.Columns)
                        s.ColumnMappings.Add(column.ToString(), column.ToString());

                    s.WriteToServer(prodSalesData);
                }
            }
        }
    }
}

回答6:

Here's how I would solve it:

Just Save your CSV File as a XLS Sheet in excel(By Doing so, you wouldn't have to worry about delimitiers. Excel's spreadsheet format will be read as a table and imported directly into a SQL Table)
Import the File Using SSIS
Write a Custom Script in the import manager to omit/modify the data you're looking for.(Or run a master script to scrutinize the data you're looking to remove)

Good Luck.

回答7:

Because they do not use the SQL import wizard, the steps would be as follows:

Right click on the database in the option tasks to import data,
Once the wizard is open, we select the type of data to be implied. In this case it would be the

Flat file source

We select the CSV file, you can configure the data type of the tables in the CSV, but it is best to bring it from the CSV.

Click Next and select in the last option that is

SQL client

Depending on our type of authentication we select it, once this is done, a very important option comes.

We can define the id of the table in the CSV (it is recommended that the columns of the CSV should be called the same as the fields in the table). In the option Edit Mappings we can see the preview of each table with the column of the spreadsheet, if we want the wizard to insert the id by default we leave the option unchecked.

Enable id insert

(usually not starting from 1), instead if we have a column with the id in the CSV we select the enable id insert, the next step is to end the wizard, we can review the changes here.

On the other hand, in the following window may come alerts, or warnings the ideal is to ignore this, only if they leave error is necessary to pay attention.

This link has images.

回答8:

Import the file into Excel by first opening excel, then going to DATA, import from TXT File, choose the csv extension which will preserve 0 prefixed values, and save that column as TEXT because excel will drop the leading 0 otherwise (DO NOT double click to open with Excel if you have numeric data in a field starting with a 0 [zero]). Then just save out as a Tab Delimited Text file. When you are importing into excel you get an option to save as GENERAL, TEXT, etc.. choose TEXT so that quotes in the middle of a string in a field like YourCompany,LLC are preserved also...

BULK INSERT dbo.YourTableName
FROM 'C:\Users\Steve\Downloads\yourfiletoIMPORT.txt'
WITH (
FirstRow = 2, (if skipping a header row)
FIELDTERMINATOR = '\t',
ROWTERMINATOR   = '\n'
)

I wish I could use the FORMAT and Fieldquote functionality but that does not appear to be supported in my version of SSMS

回答9:

I know that there are accepted answer but still, I want to share my scenario that maybe help someone to solve their problem TOOLS

ASP.NET
EF CODE-FIRST APPROACH
SSMS
EXCEL

SCENARIO i was loading the dataset which's in CSV format which was later to be shown on the View i tried to use the bulk load but I's unable to load as BULK LOAD was using

FIELDTERMINATOR = ','

and Excel cell was also using , however, I also couldn't use Flat file source directly because I was using Code-First Approach and doing that only made model in SSMS DB, not in the model from which I had to use the properties later.

SOLUTION

I used flat-file source and made DB table from CSV file (Right click DB in SSMS -> Import Flat FIle -> select CSV path and do all the settings as directed)
Made Model Class in Visual Studio (You MUST KEEP all the datatypes and names same as that of CSV file loaded in sql)
use Add-Migration in NuGet package console
Update DB

来源：https://stackoverflow.com/questions/15242757/import-csv-file-into-sql-server

标签

sql

sql-server

csv

bulkinsert

bulk