Parse : How to save all data from class to Offline Database (SQLite) in android ?
i try to get all data found in specific class and save it in local database to use it when phone without internet connection .
Create a SQLite database table and write method for inserting data into your table after parsing.As simple as that.Refer this for learning SQLite operations
You can use gson for parsing and converting them to objects. To save this data in database, you can use the greendao library for saving and fetching back.
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Question
How do I store entire files in my H2 database and retrieve them using JDBC?
Some Background
I have some text files that I have as templates for various documents that will be generated in my Spring Boot app. Currently, I have my text files stored in my local file system on my PC, but that is not a long term solution. I need to somehow store them in the database and provide the necessary code for the JDBC for the retrieval of the files.
Are there any technologies/libraries out there that would help me with this? If so, please link me to them and provide an example of how to do it in Spring Boot.
Note: It is a new requirement given to me that the text files should be stored in the database, and not the file system.
You have to use a BLOB column in your database table.
CREATE TABLE my_table(ID INT PRIMARY KEY, document BLOB);
BLOB stands for Binary Large Object.
http://www.h2database.com/html/datatypes.html#blob_type
To store it with JdbcTemplate you have to create a ByteArrayInputStream
ByteArrayInputStream inputStream = new ByteArrayInputStream(document);
preparedStatement.setBlob(3, inputStream);
Please find more examples here:
https://www.logicbig.com/tutorials/spring-framework/spring-data-access-with-jdbc/jdbc-template-with-clob-blob.html
i have a table in postgresql with about 40milion record. i want to fetch all table data into ram using jdbctemplate, when simply execute query 'select * from mytable' using jdbctemplate it take a long time to fetch data into application and map it to list of pojo class, when using copy command inside postgresql to backup table data into file, this process take just about 1 minute, my question is that is there any way to use postgresql copy command using jdbctemplate to fetch table data into java application an map it to pojo class ?
I want to store and retrieve data (a single column table for each date) date wise in MySQL database through java. Any suggestions on how to do it?
Any transaction with database through java is possible using JDBC library. JDBC is a Java API that is used to connect and execute query to the database. JDBC API uses jdbc drivers to connect to the database.
Here is an overview of the basic steps involved:
Registering the driver class
Class.forName("com.mysql.jdbc.Driver").newInstance();
Creating connection
DriverManager.getConnection("jdbc:mysql://localhost/test?" +
"user=username&password=password");
Creating statement
Write your MySQL query for storing or retrieving data from database date wise
Executing queries
Based on the query, you may get some records returned as a result or the count of rows affected
Closing connection
For more details, please refer following links:
link1
link2
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'm trying to create ODBC linked table in an Access .mdb using Jackcess.
Final String connStr = "ODBC;DRIVER={Sybase ASE ODBC Driver};NA=dbhostname,port;DB=myDbName;UID=myID;PWD=myPass;FILEDSN=path//myDSN.dsn";
Database mdb =Database.create(new File("./test.mdb");
mdb.createLinkedTable("testLinkTable",connStr, "targetTableName");
when I open test.mdb, I can see "testLinkTable", but type of link is "Access Link".
I'm expecting to create "ODBC Link" table in test.mdb.
Could somebody kindly show me the right way to accomplish this?
It appears that the .createLinkedTable() method in Jackcess is currently only able to create links to tables in another Access database. I just tested this with Jackcess 2.0.1 and the following code successfully created an Access linked table named [Clients] that points to another Access database:
Database database = DatabaseBuilder.open(new File("C:\\__tmp\\jTest\\linkTest.accdb"));
String linkedTableLocalName = "Clients";
String linkedTableSource = "C:\\Users\\Public\\Database1.accdb";
String linkedTableRemoteName = "Clients";
database.createLinkedTable(linkedTableLocalName, linkedTableSource, linkedTableRemoteName);
However, this code created a linked table named [dbo_Addresses] that looked like a link to another Access database (not an ODBC linked table as intended) and did not work:
Database database = DatabaseBuilder.open(new File("C:\\__tmp\\jTest\\linkTest.accdb"));
String linkedTableLocalName = "dbo_Addresses";
String linkedTableSource = "ODBC;DSN=myDb;Trusted_Connection=Yes;APP=Microsoft Office 2010;DATABASE=myDb;";
String linkedTableRemoteName = "dbo.Addresses";
database.createLinkedTable(linkedTableLocalName, linkedTableSource, linkedTableRemoteName);