This document discusses connecting to and interacting with remote databases using JDBC in Java. It describes PreparedStatement and ResultSet interfaces for executing queries and accessing results. Methods are provided for navigating through rows, accessing columns by index or name, and performing data manipulation like inserts, updates and deletes. The steps for connecting include loading a driver, getting a connection, creating statements, executing queries, and navigating result sets.

1. Prepared Statement Interface
•It extends the statement interface.
•Multiple executions of a SQL statement pre-
compiled and stored in a PreparedStatement
object.
•Methods
•executeQuery() – execute SQL statements
•executeUpdate() – execute SQL UPDATE, DELETE
or INSERT statements. DDL statements can also be
executed if the SQL statements does not return
values.

2. ResultSet interface
•It stored, accessed data from the database.
•It watches single row of a data at a time. The row
of data is called current row.
•Methods
•void close() – release a resultset database
resource and JDBC resources.
•void getString() – gets the value of a column in the
current row.
•next() – it is used to retrieve the next row values.

3. ResultSetMetaData interface
•It is returned by getMetaData() constructor
provides access to information which indicates the
number, type and properties of resultset columns
•Methods
•getColumnCount() – returns the number of
columns in the resultset.
•String getColumnName(int) – returns the name of
the column.
•getTableName() – returns the name of a table

4. Connecting to Remote Database
•Steps to connect remote database
1. Loading an appropriate database server
2.Locating a DBMS on the harddisk
3. Establishing a connection
4. Creating and firing SQL queries against the database
5. Creating a RecordSet object

5. Connecting to Remote Database
•Choosing an appropriate driver
•Driver is required to allow the JDBC API to manage the
connection.
•Java program code is used to force a particular
database driver to be loaded.
•Eg.:JDBC-ODBC bridge driver:
•Class.forName(“sun:jdbc.odbc.JdbcOdbcDriver”);

6. Connecting to remote database
•getConnection() method of the DriverManager is
used to request a Connection Object.
•A variable called url is used to hold the binding
between the jdbc:odbc bridge and the name of the
DSN.
•E.g.:
•String url=“jdbc:odbc:datasource”;
•Class.forName(“sun.jdbc.odbc.JdbcOdbcDriver”);
•Connection conn=Driver.getConnection(url);

7. Connecting to Remote Database
•Performing database queries and updates
•It provides various techniques of performing database
queries and updates.
•The SQL statement is created using createStatement()
method.
•Syntax: Statement createStatement();
•E.g.:
•Statement st=conn.createStatement();

8. Navigating Multiple Rows retrieved from database
•It can be retrieved by resultset query.
•Extraction of values from the current row is
possible in two ways
•Accessing columns of the current row by index number
•Accessing columns of the current row by name

9. Navigating Multiple Rows retrieved from database
•Accessing columns by the column indexes
•It is used to fetch column data of the current row by using the column
index
•Methods
•String getString(int columnindex)
•Boolean getBoolean(int columnindex)
•Byte getByte(int columnindex)
•Short getShort(int columnindex)
•Int getInt(int columnindex)
•Long getLong(int columnindex)
•Float getFloat(int columnindex)
•Double getDouble(int columnindex)
•rs.getString(1);
•rs.getLong(3);

10. Navigating Multiple Rows retrieved from database
•Accessing columns by the column names
•It is more convenient to use as a means of access to columns.
•Methods
•String getString(int columnname)
•Boolean getBoolean(int columnname)
•Byte getByte(int columnname)
•Short getShort(int columnname)
•Int getInt(int columnname)
•Long getLong(int columnname)
•Float getFloat(int columnname)
•Double getDouble(int columnname)
•rs.getString(“name”);
•rs.getLong(“salary”);

11. Data manipulation
•Inserting, Deleting and Updating records in an access table
using Java code.
•Insert Record – adds a new value to the database.
•E.g.: Insert into tablename values(column values);
•Update Record – This parts update the records in the
database.
•E.g.: Update tablename set columnname1=value1,
columnname2=value2…
•Delete Record – It deletes the records in the database.
•E.g.: Delete from tablename where columnname=value;
•Retrieve record – select * from tablename where
columnname=value or select * from tablename;

12. Data navigation
•The portion of the code deals with navigation through
the records.
•The records from the ResultSet are stored in the
vector and the navigation of the records are done
through the vector.
•Methods
•First() – move to the first record
•Next() – move to the next record
•Last() – move to the last record
•Previous() – move to the previous record
•E.g.: rs.first(); rs.next(); rs.last(); rs.previous();