author | Markus Bröker <mbroeker@largo.dyndns.tv> |
Fri, 19 Nov 2010 00:11:16 +0100 | |
changeset 154 | 142730cfecee |
parent 135 | f837cf975e95 |
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/** |
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* Simple Database Client for Java |
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* |
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*/ |
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package org.homelinux.largo.sql.client; |
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import java.util.List; |
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import java.util.ArrayList; |
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import java.sql.Connection; |
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import java.sql.DriverManager; |
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import java.sql.DatabaseMetaData; |
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import java.sql.ResultSet; |
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import java.sql.Statement; |
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import java.sql.SQLException; |
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import javax.naming.Context; |
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import javax.naming.NamingException; |
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import javax.naming.InitialContext; |
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import javax.sql.DataSource; |
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public class DBClient { |
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private Connection connection; |
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private DatabaseMetaData metadata; |
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private Statement statement; |
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private ResultSet resultset; |
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private String driver, username, password; |
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private String dbURL; |
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/** |
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* Constructor to connect to a database with a specific driver |
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* and connection string |
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*/ |
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public DBClient (String driver, String dbURL, String username, String password) throws ClassNotFoundException, SQLException { |
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this.driver = driver; |
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this.dbURL = dbURL; |
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Class.forName (driver); |
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connect (username, password); |
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} |
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/** |
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* Constructor to connect to a database with a specific driver |
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* and connection string |
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*/ |
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public DBClient (String driver, String dbURL) throws ClassNotFoundException, SQLException { |
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this (driver, dbURL, null, null); |
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} |
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/** |
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* Default Constructor to connect to my database |
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*/ |
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public DBClient () throws ClassNotFoundException, SQLException { |
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this ("org.apache.derby.jdbc.EmbeddedDriver", "jdbc:derby:clubstatistik", null, null); |
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} |
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* Constructor to connect to a DataSource on an AppServer |
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*/ |
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public DBClient (String jndiResource) throws NamingException, SQLException { |
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Context ctx = new InitialContext (); |
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DataSource ds = (DataSource) ctx.lookup (jndiResource); |
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connection = ds.getConnection (); |
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statement = connection.createStatement (); |
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} |
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protected void connect(String user, String pass) throws SQLException { |
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assert (connection == null) : "CONNECT: Already connected"; |
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this.username = user; |
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this.password = pass; |
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connection = DriverManager.getConnection (dbURL, username, password); |
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metadata = connection.getMetaData(); |
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statement = connection.createStatement (); |
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} |
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public void disconnect () throws SQLException { |
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if (connection == null) |
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throw new SQLException ("DISCONNECT: Not connected"); |
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else |
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connection.close (); |
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} |
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public String getColumn (int pos) throws SQLException { |
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return resultset.getString (pos); |
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} |
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public String getColumn (String name) throws SQLException { |
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return resultset.getString (name); |
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} |
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public List<String> getTables() throws SQLException { |
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List<String> list = new ArrayList<String>(); |
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resultset = metadata.getTables(null, null, "%", null); |
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while (resultset.next()) { |
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list.add(resultset.getString("TABLE_NAME")); |
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} |
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return list; |
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} |
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public List<String> getColumns(String table) throws SQLException { |
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List<String> list = new ArrayList<String>(); |
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resultset = metadata.getColumns(null, null, table, null); |
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while (resultset.next()) { |
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list.add(resultset.getString("COLUMN_NAME")); |
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} |
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return list; |
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} |
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public Connection getConnection () { |
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return connection; |
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} |
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public String getDbURL () { |
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return dbURL; |
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} |
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public String getDriver () { |
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return driver; |
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} |
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public String getPassword () { |
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return password; |
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} |
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public String getUsername () { |
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return username; |
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} |
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public boolean hasNext () throws SQLException { |
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return resultset.next (); |
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} |
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public void query (String query) throws SQLException { |
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resultset = statement.executeQuery (query); |
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} |
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/** |
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* returns the number of updated rows |
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*/ |
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public int update (String update) throws SQLException { |
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return statement.executeUpdate (update); |
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} |
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public void setConnection (Connection connection) { |
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this.connection = connection; |
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} |
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|
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public void setDbURL (String dbURL) { |
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this.dbURL = dbURL; |
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} |
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|
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public void setDriver (String driver) { |
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this.driver = driver; |
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} |
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|
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public void setPassword (String password) { |
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this.password = password; |
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} |
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|
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public void setUsername (String username) { |
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this.username = username; |
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} |
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} |