Top 10 JDBC interview questions?

1. What is JDBC, and for what reason is it utilized?

JDBC (Java Data set Network) is a Programming interface that permits Java applications to communicate with data sets. It gives techniques to associate with the information base,

execute questions, and recover results. It is utilized to oversee information in social data sets through

SQL orders.


2. What are the center parts of the JDBC engineering?

Driver Director: Oversees data set drivers.

Driver: Lays out the association between the Java application and the information base.

  • Association: Addresses the association with the information base.

  • Proclamation: Used to execute SQL questions.

  • ResultSet: Addresses the outcome set of an inquiry.


3. Make sense of the various sorts of JDBC drivers.

 There are four sorts:

Type-1: JDBC-ODBC Extension Driver.

Type-2: Local Programming interface Driver.

Type-3: Organization Convention Driver.

Type-4: Slim Driver (Direct-to-Data set Unadulterated Java Driver).


4. How would you enlist a JDBC driver in a Java application?

Use Class.forName() technique to progressively stack the driver class. For instance:


Class.forName("com.mysql.cj.jdbc.Driver");


5. What is a PreparedStatement, and how can it vary from an Assertion?

  • PreparedStatement: Precompiles the SQL inquiry, permitting better execution and assurance against SQL infusion.

  • Articulation: Executes SQL inquiries without precompilation, making it less proficient and powerless against SQL infusion.


6. What is the job of the ResultSet interface in JDBC?

ResultSet holds the information recovered from a data set question. It gives techniques to explore through and read the information. Model:


while(rs.next()) {

    System.out.println(rs.getString("columnName"));

}


7. What are the distinctions between execute(), executeQuery(), and executeUpdate()?

  • execute(): Utilized for the two inquiries and updates. Returns a boolean.

  • executeQuery(): Executes a SELECT question and returns a ResultSet.

  • executeUpdate(): Executes DML/DDL orders and returns the quantity of lines impacted.


8. How might you deal with exchanges in JDBC?

 Utilize the setAutoCommit() and commit() or rollback() techniques.

Model:

conn.setAutoCommit(false);

attempt {

    stmt.executeUpdate("SQL Inquiry 1");

    stmt.executeUpdate("SQL Inquiry 2");

    conn.commit();

} get (SQLException e) {

    conn.rollback();

}


9. What are the limits of JDBC?

  • Requires a ton of standard code for straightforward tasks.

  • Data set explicit drivers are required.

  • Less appropriate for huge scope endeavor applications.


10. How would you deal with SQL special cases in JDBC?

Utilize an attempt get block to get SQLException. For investigating, recover subtleties utilizing strategies like

getMessage(), getSQLState(), and getErrorCode().

attempt {

    // JDBC code

} get (SQLException e) {

    System.out.println("Error: " + e.getMessage());

}


 

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