How to check whether database exists?
Hi,
I have to create a database in mysql. I am able to create that successfully from using JDBC. But before to creating the database, i want to check whether database exists or not? How can i do this check. can any one help me on this.
Please find thesample code
`public class CreateDatabase { public static void main(String[] args) {
Connection connection = null;
Statement statement = null;
try {
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
String url = "jdbc:mysql://localhost/mysql";
connection = DriverManager.getConnection(url, "username", "password");
statement = connection.createStatement();
String hrappSQL = "CREATE DATABASE hrapp";
statement.executeUpdate(hrappSQL);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (statement != null) {
try {
statement.close();
} catch (SQLException e) {
} // nothing we can do
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
} // nothing we can do
}
}
}
} `
Thanks, Narayan
View Answers
November 13, 2010 at 5:30 PM
Hi Friend,
You can use the following code:
import java.sql.*;
import java.util.*;
class CheckDatabase{
public static void main(String[] args) throws Exception{
ArrayList<String> list=new ArrayList<String>();
Scanner input=new Scanner(System.in);
System.out.println("Enter Database name:");
String database = input.nextLine();
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306","root","root");
Statement st = con.createStatement();
DatabaseMetaData meta = con.getMetaData();
ResultSet rs = meta.getCatalogs();
while (rs.next()) {
String listofDatabases=rs.getString("TABLE_CAT");
list.add(listofDatabases);
}
if(list.contains(database)){
System.out.println("Database already exists");
}
else{
st.executeUpdate("CREATE DATABASE "+database);
System.out.println("Database is created");
}
rs.close();
}
}
Thanks
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