Java连接各种数据库，DB2、Mysql、Oracle、Hsqldb。。

[color=red][size=medium]ConnectHSQLDB.java[/size][/color]

/**
 * ConnectHSQLDB.java
 */
package com.javaworkspace.connecthsqldb;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectHSQLDB {
	public static void main(String[] args) {

		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("org.hsqldb.jdbcDriver");
			connection = DriverManager.getConnection(
					"jdbc:hsqldb:file:C:\\HyperSQLDB\\EMPLOYEEDB", "SA", "");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]ConnectMySQL.java[/size][/color]

/**
 * ConnectMySQL.java
 */
package com.javaworkspace.connectmysql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectMySQL {
	public static void main(String[] args) {
		try {
			Class.forName("com.mysql.jdbc.Driver");
			Connection connection = DriverManager.getConnection(
					"jdbc:mysql://localhost:3306/EMPLOYEE", "root", "root");
			Statement statement = connection.createStatement();
			ResultSet resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

[color=red][size=medium]Connect MS SQL Server[/size][/color]

/**
 * ConnectMSSQL.java
 */
package com.javaworkspace.connectmssql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectMSSQL {
	public static void main(String[] args) {
		try {
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
			Connection connection = DriverManager
					.getConnection(
							"jdbc:sqlserver://localhost:1433;databaseName=EMPLOYEE;selectMethod=cursor",
							"username", "password");

			System.out.println("DATABASE NAME IS:"
					+ connection.getMetaData().getDatabaseProductName());
			Statement statement = connection.createStatement();
			ResultSet resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

// Connect using JDTS driver
/**
 * ConnectMSSQL.java
 */
package com.javaworkspace.connectmssql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectMSSQL {
	public static void main(String[] args) {
		try {
			Class.forName("net.sourceforge.jtds.jdbc.Driver");
			Connection connection = DriverManager
					.getConnection(
							"jdbc:jtds:sqlserver://localhost:1433;databaseName=EMPLOYEE;sendStringParametersAsUnicode=false",
							"username", "password");
			System.out.println("DATABASE NAME IS:"
					+ connection.getMetaData().getDatabaseProductName());
			Statement statement = connection.createStatement();
			ResultSet resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

[color=red][size=medium]Connect Oracle[/size][/color]

/**
 * ConnectOracle.java
 */
package com.javaworkspace.connectoracle;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectOracle {

	public static void main(String[] args) {

		try {
			DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
			System.out.println("Connecting to the database...");
			Connection connection = DriverManager.getConnection(
					"jdbc:oracle:thin:@localhost:1521:orcl", "scott", "tiger");
			Statement statement = connection.createStatement();
			ResultSet resultset = statement.executeQuery("select 'Connected' from dual");
			resultset.next();
			String s = resultset.getString(1);
			System.out.println(s);
			statement.close();
			connection.close();
		} catch (Exception e) {
			System.out.println("The exception raised is:" + e);
		}
	}

}

[color=red][size=medium]Connect DB2[/size][/color]

/**
 * ConnectDB2.java
 */
package com.javaworkspace.connectdb2;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectDB2 {
	public static void main(String[] args) {
		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("com.ibm.db2.jcc.DB2Driver");
			connection = DriverManager.getConnection(
					"jdbc:db2://localhost:5021/EMPLOYEE", "username",
					"password");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]Connect Postgre[/size][/color]

/**
 * ConnectPostgre.java
 */
package com.javaworkspace.connectpostgre;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectPostgre {
	public static void main(String[] args) {
		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("org.postgresql.Driver");
			connection = DriverManager.getConnection(
					"jdbc:postgresql://localhost:5432/EMPLOYEE", "postgres",
					"password");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]Connect ADS[/size][/color]

/**
 * ConnectADS.java
 */
package com.javaworkspace.connectads;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectADS {
	public static void main(String[] args) {
		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("com.extendedsystems.jdbc.advantage.ADSDriver");
			connection = DriverManager.getConnection(
					"jdbc:extendedsystems:advantage://localhost:6262;catalog=C:\\yourDatbase\\data;TableType=cdx;LockType=proprietary", "AdsSys", "no");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]Connect Derby[/size][/color]

/**
 * ConnectDerby.java
 */
package com.javaworkspace.connectderby;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectDerby {
	public static void main(String[] args) {

		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
			connection = DriverManager
					.getConnection("jdbc:derby:C:/DerbyDatabase/EMPLOYEE");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]Connect Firebird[/size][/color]

/*
 * ConnectFirebirdDB.java
 */
package com.javaworkspace.connectfirebirddb;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectFirebirdDB {
	public static void main(String[] args) {

		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("org.firebirdsql.jdbc.FBDriver");
			connection = DriverManager
					.getConnection(
							"jdbc:firebirdsql://localhost:3050/C:/FirebirdDB/EMPLOYEEDB.fdb",
							"sysdba", "masterkey");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]Connect H2[/size][/color]

/*
 * ConnectH2DB.java
 */
package com.javaworkspace.connecth2db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectH2DB {
	public static void main(String[] args) {

		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("org.h2.Driver");
			connection = DriverManager.getConnection(
					"jdbc:h2:C:\\H2DB\\database\\EMPLOYEEDB", "sa", "");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]Connect SQLite[/size][/color]

/**
 * ConnectSQLite.java
 */
package com.javaworkspace.connectsqlite;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectSQLite {
	public static void main(String[] args) {

		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("org.sqlite.JDBC");
			connection = DriverManager
					.getConnection("jdbc:sqlite:C:\\SQLite\\EMPLOYEE.db");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

[color=red][size=medium]Connect SmallSQL[/size][/color]

/**
 * ConnectSmallSQL.java
 */
package com.javaworkspace.connectsmallsql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author www.javaworkspace.com
 * 
 */
public class ConnectSmallSQL {
	public static void main(String[] args) {

		Connection connection = null;
		ResultSet resultSet = null;
		Statement statement = null;

		try {
			Class.forName("smallsql.database.SSDriver");
			connection = DriverManager
					.getConnection("jdbc:smallsql:C:\\SmallSQL\\database\\EMPLOYEEDB");
			statement = connection.createStatement();
			resultSet = statement
					.executeQuery("SELECT EMPNAME FROM EMPLOYEEDETAILS");
			while (resultSet.next()) {
				System.out.println("EMPLOYEE NAME:"
						+ resultSet.getString("EMPNAME"));
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				resultSet.close();
				statement.close();
				connection.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

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