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CreateAndSelectDatabase.java
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CreateAndSelectDatabase.java
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package com.jayden.study.dictionary.database;
import com.jayden.study.utils.JdbcUtils;
import javax.swing.plaf.nimbus.State;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* Creating and Selecting a Database
*
* @author jayden-lee
*/
public class CreateAndSelectDatabase {
private static final String url = "jdbc:mysql://localhost:3306/mysql";
private static final String user = "user";
private static final String password = "password";
private static Connection connection;
private static Type type = Type.SQL;
public enum Type {
JDBC_API,
SQL
}
public static void main(String[] args) {
try {
connection = JdbcUtils.getConnection(url, user, password);
printCurrentDatabase();
createDatabase();
selectDatabase();
printCurrentDatabase();
} catch (Exception e) {
e.printStackTrace();
} finally {
JdbcUtils.closeConnection(connection);
}
}
private static void createDatabase() throws SQLException {
System.out.println("Create a testdb2 Database");
String sql = "CREATE DATABASE testdb2";
try (Statement statement = connection.createStatement()) {
statement.execute(sql);
} catch (SQLException e) {
throw e;
}
}
private static void selectDatabase() throws SQLException {
System.out.println("Select a testdb2 Database");
if (Type.JDBC_API == type) {
connection.setCatalog("testdb2");
} else if (Type.SQL == type) {
String sql = "USE testdb2";
try (Statement statement = connection.createStatement()) {
statement.execute(sql);
} catch (SQLException e) {
throw e;
}
}
}
private static void printCurrentDatabase() throws SQLException {
String sql = "SELECT DATABASE()";
String databaseName = null;
try (Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery(sql)) {
if (resultSet.next()) {
databaseName = resultSet.getString(1);
}
}
System.out.println("Current Database: " + databaseName);
}
}