I have create sample program using DataContext class for get all information of tables and write into csv file.Can I use DataContext or any other options in java for getting information of all views?
My sample code for getting table and write into csv.
UpdateableDataContext dataContext = DataContextFactory.createCsvDataContext(tmpCSV);
TableCreationBuilder table = callback.createTable(getDataContext().getDefaultSchema(),"Table1").execute();
RowInsertionBuilder insert = callback.insertInto(table);
//we are getting each column from each record and than run
insert.value("columnName","value")
//After inserting all records we are execute below command to insert data into csv
insert.execute();
Please suggest how can I use DataContext or other any java code for getting views and write its data in csv file.
Thanks in Advance!!
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I am not an advanced Java developer.
I am working on a project to insert records into tables in a SQL database by reading the data in a CSV file. The Employee CSV file has several columns containing data. There is an XML file which contains the mapping information, that is, the XML file says which column in the CSV file contains what information.
I have been successful in reading the CSV file with the mapping in the XML file. I have also been successful in inserting the data in the CSV file into database tables. But there is a catch. The CSV file is a file containing the all the historical records of employees in chronological order (oldest record first). In the scenario where there are multiple records for an employee, his/her last record in the file contains his/her current information and needs to be inserted into the Employee table. All of his/her older records need to be inserted into the Employee_History table in the same order they appear in the CSV file. Column 0 of the CSV file contains the Employee ID. The following is to give an idea of what the CSV file looks like
Emp_ID|First Name|Last Name|Email|Update Date
123|John|Smith|john.smith01#email.com|01/01/2020
234|Bruce|Waye|bruce.wayne#wayneenterprises.com|02/02/2020
123|John|Smith|john.smith02#email.com|02/15/2020
345|Clark|Kent|clark.kent#dailyplanet.com|02/16/2020
123|John|Smith|john.smith03#email.com|02/20/2020 -- **Last record in the CSV file for Emp ID = 123**
Can anyone please tell me the best way to approach this? I am struggling to come up with a way to identify a given custodian's last record in the CSV file.
i have a scenario where i have a file of the form,
id,class,type
1,234,gg
2,235,kk
3,236,hth
4,237,rgg
5,238,rgr
I also have a table in my database of the form PROPS,
id,class,property
1,7735,abc
2,3454,efg
3,235,hij
4,238,klm
5,24343,xyx
Now the first file and the db table are joined based on class so that final output will be of the form:
id,class,type,property
1,235,kk,hij
2,238,rgr,klm
Now, i can search the db table for each class record of the first file and so forth.
But this will take too much time.
Is there any way to do this same thing through a MySQL STORED PROCEDURE?
My question is whether there is a way to read the first file content line by line(WITHOUT MAKING USE OF A TEMPORARY TABLE), check the class with the class in the db table and insert the result into an output file and return the output file using MYSQL STORED PROCEDURE?
I'm trying to export data and meta data from Mysql Database to a JSON .
My JSON output need to have this structure :
{ "classifier":[
{
"name":"Frequency",
"value":"75 kHz"
},
{
"name":"depth",
"value":"100 m"
} ]}
Frequency for me represent a column Name and 75 Khz is the value of the column for a specific row.
I'm using Talend data integration to do this, and i can get the data, but i can't figure out how to get the meta data, do i have to enter it myself ? or there is a more easy way to do this ?
You cannot export metadata of json file from Mysql because Mysql provide a structured data, hence we have to create our json structure independently using an existing file or manually, the easiest way is to create a sample file like the one used in your question. See Talend Help.
Hi I am creating table using schema file and loading table from data file through jdbc. I am doing batch upload using PreparedStatement and executeBatch. Data file contents look like the following structure:
key time rowid stream
X 11:40 1 A
Y 3:30 2 B
Now I am able to load successfully table in database. But I would like to test/verify that same table loaded into database against this same data file. how do I do it? How do compare table in database with data file? I am new to JDBC. Please guide. Thanks in advance.
Like Loki said, you can use a tool like DBUnit. Another option is to make a rudimentary integration test whereby your test generates a dump file of your table and compares this dump with the original "good" file.
You need DBunit . Check more details here : http://dbunit.sourceforge.net/howto.html
DB unit helps you to write test cases against data from database.
I want to insert the Xml file data into MySQL table ,, by choosing which column to insert into ,, using Java How will this be done ?
It really depends on the format of your XML file. If your XML file is a direct export from the MySQL file, please refer to this question.
If your XML is in some other format, then I would probably be using JAXB to parse XML into POJO, then write some logic to map the POJO into the database table.