JDBC is a Java API that allows Java programs to connect to relational databases. It establishes a connection, sends SQL statements, and processes results. There are four types of JDBC drivers. To execute SQL queries, a statement is created using the connection and then execute, executeUpdate, or executeQuery methods are called depending on if the query is DDL, DML, or DQL. The example program connects to a MySQL database, creates a statement, executes a SELECT query on a table, and prints out the results.

1. Select query in
JDBC
Subject: Advanced java technology
CE-B
Maulik togadiya

2. What is JDBC?
 Java API for connecting programs written in
Java to the data in relational databases.
 Tasks of JDBC:
 Establishes a connection with a database
 Sends SQL statements
 Processes the results
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3. JDBC
 Store
 Update
 Retrieve
 Delete
 It converts java statements into a SQL
statement.
 For that it uses drivers..
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4. JDBC
 There are four type of drivers
JDBC-ODBC bridge
Native API
Network–third party drivers
Pour java(thin drivers)
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5. JDBC
 Some class and interfaces :
DriverManager(class)
Connection(interface)
Statement(interface)
SQLException(class)
ResultSet(interface)
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6. How to execute SQL query?
 Create statement(using 3 ways)
 Using statement
Statement st=conn.createStastement()
 Using preparedStatement
PreparedStatement pst=conn.prepareStatement(“Sql”)
 Using callablestatement
CallableStatement cs=conn.createCall()
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7. How to execute SQL query?
 Using Statement
St.execute(DDL)
St.executeUpdate(DML)
St.executeQuery(DRL)
 Using prepared statement
pst.execute() DDL
pst.executeUpdate() DML
pst.executeQuery() DRL
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8. Program: Fire select query on DB
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import java.sql.*;
public class SelectDataDemo
{
public static void main(String[] args)
{
Class.forName("com.mysql.jdbc.Driver");
connection
=DriverManager.getConnection("jdbc:mysql://localhost:33
06/JDBCDemo", "root", "password");

9. 9
/*Statement st = conn.createStatement();
st.executeUpdate("INSERT INTO EMPLOYEE
(ID,FIRST_NAME) VALUES (1,'Lokesh','Gupta')");
st.executeUpdate("INSERT INTO EMPLOYEE
(ID,FIRST_NAME) VALUES (2,‘Mahesh',‘Patel')");*/
Statement st = connection.createStatement();
ResultSet rs = st.executeQuery("SELECT
ID,FIRST_NAME,LAST_NAME WHERE ID <= 5");
while(rs.next())
{
System.out.println(rs.getString(1)); //First Column
System.out.println(rs.getString(2)); //Second Column
System.out.println(rs.getString(3)); //Third Column
}

10.
st.close();
conn.close();
}
 Output:
1
Lokesh
Gupta
2
Mahesh
Patel