MySQL Connection String
This section gives you brief description of MySQL
connection string. For the connection in mysql, we need some information about
database like server network address, user id, password and name of
database.
For example,
Server=192.168.10.146;
Port=3306;
Uid=root;
Pwd=root;
Database= sqlexamples;
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Server: The network address to connect with MySQL.
The default is localhost (127.0.0.1).
Port: MySQL port number for connections. Default is 3306.
Uid: MySQL user account id to connect with MySQL.
Pwd: MySQL user password to connect with MySQL.
Database: Name of the database to work upon.
The above information is used to make a connection string
while connecting with the database. In the application below, we have connected
to the MySQL database and retrieved the employee names from the database using
JDBC. Here are some steps to follow while writing JDBC program:
- Loading
Driver
- Establishing
Connection
- Executing
Statements
- Getting
Results
- Closing
Database Connection
Database Table: employee
|
CREATE TABLE `employee1` (
`emp_id` int(11) NOT NULL auto_increment,
`emp_name` varchar(10) character set utf8 NOT NULL,
`emp_salary` int(11) NOT NULL,
`emp_startDate` datetime NOT NULL,
`dep_name` varchar(50) NOT NULL,
PRIMARY KEY (`emp_id`)
)
|
Here is the code of java
program that retrieves all the employee data from database and displays on the
console:
|
import
java.sql.*;
public
class RetriveAllEmployees{
public static void main(String[] args) {
System.out.println("Getting All Rows from employee
table!");
Connection con = null;
String url = "jdbc:mysql://192.168.10.146:3306/";
String db = "sqlexamples";
String driver = "com.mysql.jdbc.Driver";
String user = "root";
String pass = "root";
try{
Class.forName(driver);
con = DriverManager.getConnection(url+db, user, pass);
Statement st = con.createStatement();
ResultSet res = st.executeQuery("SELECT * FROM employee");
System.out.println("Employee Name: " );
while (res.next()) {
String employeeName = res.getString("emp_name");
System.out.println(employeeName );
}
con.close();
}
catch (ClassNotFoundException e){
System.err.println("Could not load JDBC driver");
System.out.println("Exception: " + e);
e.printStackTrace();
}
catch(SQLException ex){
System.err.println("SQLException information");
while(ex!=null) {
System.err.println ("Error msg: " + ex.getMessage());
System.err.println ("SQLSTATE: " + ex.getSQLState());
System.err.println ("Error code: " + ex.getErrorCode());
ex.printStackTrace();
ex = ex.getNextException(); // For drivers that support chained
exceptions
}
}
}
}
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Output:
|
C:\vinod>javac
RetriveAllEmployees.java
C:\vinod>java
RetriveAllEmployees
Getting All Rows from
employee table!
Employee Name:
Vinod
Amar
Ravi
Suman
Noor
Pinku
Rakesh
Vikash
|
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