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Top 15 Java JDBC Interview Questions for 2022

1) What are the types of JDBC Drivers in Java?

JDBC Drivers are of four types are:
  • JDBC-ODBC bridge driver
  • Native-API driver
  • Network Protocol driver
  • Thin driver

2) What are the five steps to connect to the database in Java?

Five steps to connect to the database are :
  • Step1: Register the driver class
  • Step2: Creating connection
  • Step3: Creating statement
  • Step4: Executing queries
  • Step5: Closing connection

3) What are the commonly used methods of DriverManager class in Java?

Commonly used methods of DriverManager class are:
  • public static void registerDriver(Driver driver)
  • public static void deregisterDriver(Driver driver)
  • public static Connection getConnection(String url)
  • public static Connection getConnection(String url,String userName,String password)

4) What are the commonly used methods of Statement interface in Java?

The commonly used methods of Statement interface in java are:
  • public ResultSet executeQuery(String sql)
  • public int executeUpdate(String sql)
  • public boolean execute(String sql)
  • public int[] executeBatch()

5) What are the commonly used methods of ResultSet interface in Java?

The commonly used methods of ResultSet interface are:
  • public boolean next()
  • public boolean previous()
  • public boolean first()
  • public boolean last()
  • public boolean absolute(int row)
  • public boolean relative(int row)
  • public int getInt(int columnIndex)
  • public int getInt(String columnName)
  • public String getString(int columnIndex)
  • public String getString(String columnName)

6) What are the commonly used methods of PreparedStatement interface in Java?

The commonly used methods of PreparedStatement interface are:
  • public void setInt(int paramIndex, int value)
  • public void setString(int paramIndex, String value)
  • public void setFloat(int paramIndex, float value)
  • public void setDouble(int paramIndex, double value)
  • public int executeUpdate()
  • public ResultSet executeQuery()

7) What are the commonly used methods of ResultSetMetaData interface in Java?

The commonly used methods of ResultSetMetaData interface are:
  • public int getColumnCount()throws SQLException
  • public String getColumnName(int index)throws SQLException
  • public String getColumnTypeName(int index)throws SQLException
  • public String getTableName(int index)throws SQLException

8) What are the commonly used methods of DatabaseMetaData interface in Java?

The commonly used methods of DatabaseMetaData interface are:
  • public String getDriverName()throws SQLException
  • public String getDriverVersion()throws SQLException.
  • public String getUserName()throws SQLException
  • public String getDatabaseProductName()throws SQLException
  • public String getDatabaseProductVersion()throws SQLException
  • public ResultSet getTables(String catalog, String schemaPattern, String tableNamePattern, String[] types)throws SQLException

9) What are the types of ResultSet in Java?

There are three types of ResultSet in Java are:
  • TYPE_FORWARD_ONLY
  • TYPE_SCROLL_INSENSITIVE
  • TYPE_SCROLL_SENSITIVE

10) How can I connect Java Application with Oracle database in java?

Example:
import java.sql.*;    
class OracleConn  
{    
public static void main(String args[])  
{    
try  
{    
Class.forName("oracle.jdbc.driver.OracleDriver");    
Connection con=DriverManager.getConnection(    
"jdbc:oracle:thin:@localhost:1521:xe","system","oracle");  // Here system is username and oracle is password.  
Statement stmt=con.createStatement();    
ResultSet rs=stmt.executeQuery("select * from emp");    
while(rs.next())    
System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));    
con.close();    
}  
catch(Exception e)  
{   
System.out.println(e);  
}    
}    
}

11) How can I connect Java Application with mysql database in java?

Example:
import java.sql.*;    
class MysqlConn  
{    
public static void main(String args[])  
{    
try  
{    
Class.forName("com.mysql.jdbc.Driver");    
Connection con=DriverManager.getConnection(    
"jdbc:mysql://localhost:3306/atul","root","root");   // Here atul is database name and root is username and password.  
Statement stmt=con.createStatement();    
ResultSet rs=stmt.executeQuery("select * from emp");    
while(rs.next())    
System.out.println(rs.getInt(1)+"  "+rs.getString(2)+"  "+rs.getString(3));    
con.close();    
}  
catch(Exception e)  
{  
System.out.println(e);  
}    
}    
}

12) How many packages are available in JDBC API?

There are two types of packages are available in JDBC API:
  • Java.sql
  • Javax.sql

13) What are the commonly used implementation classes of RowSet interface in Java?

The commonly used implementation classes of RowSet interface are:
  • JdbcRowSet
  • CachedRowSet
  • WebRowSet
  • JoinRowSet
  • FilteredRowSet

14) What are the advantages of RowSet interface in Java?

Advantages of RowSet interface are:
  • easy to use
  • Flexible to use
  • Scrollable
  • Updatable bydefault

15) Result Sets index starts with 0 or 1?

ResultSet index starts with 1.



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