自定义JDBC连接池

使用装饰者的方式完成类的方法的增强

package bull02.JDBCconnectionPool;
/**
 * 使用装饰者的方式完成类的方法的增强
 * @author 45度炸
 *
 */
public class EnhanceDemo1 {
    public static void main(String[] args) {
        Waiter waiter = new Waiteress();
        Waiter waiterresswraper = new WaiterressWrapper(waiter);
        waiterresswraper.server();
    }
}

interface Waiter {
    public void server();
}

class Waiteress implements Waiter {

    @Override
    public void server() {
        System.out.println("服务...");

    }

}

class WaiterressWrapper implements Waiter {

    private Waiter waiter;
    public WaiterressWrapper(Waiter waiter) {
        this.waiter = waiter;//传入Waiter的waiter,时的this.waiter变成Waiteress类的waiter
    }
    @Override
    public void server() {
        System.out.println("微笑...");
        this.waiter.server();////传入Waiter的waiter,时的this.waiter变成Waiteress类的waiter
    }

}

测试类

package bull02.JDBCconnectionPool;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.sql.DataSource;

import org.junit.Test;

import bull01.JDBCbasis.JDBCUtils;

/**
 * 
 * @author 45度炸
 * 自定义连接池测试
 */
public class JDBCTest {
    @Test
    public void demo1() {
        Connection conn = null;
        PreparedStatement psmt = null;
        ResultSet rs = null;

        try {
            DataSource dataSource = new MyDataSource();
            conn = dataSource.getConnection();
            String sql = "select * from category";
            psmt = conn.prepareStatement(sql);
            rs = psmt.executeQuery();
            while(rs.next()) {
                System.out.println(rs.getInt("cid")+"---"+rs.getString("cname"));
            }
        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            JDBCUtils.closeResource(rs, psmt, conn);
        }
    }
}

MyDataSource

package bull02.JDBCconnectionPool;

import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;

import javax.sql.DataSource;

import bull01.JDBCbasis.JDBCUtils;

/**
 * 
 * @author 45度炸
 * 自定义连接池
 */
public class MyDataSource implements DataSource {
    //创建一个list集合存放链接
    private List<Connection> list = new ArrayList<Connection>();

    public MyDataSource() {
        //初始化3个连接
        for(int i = 0;i < 3;i++) {
            Connection conn = JDBCUtils.getConnection();
            list.add(conn);
        }
    }

    @Override
    public Connection getConnection() throws SQLException {
        // 获得连接
        if(list.size() <= 0) {
            for(int i = 0;i < 3;i++) {
                Connection conn = JDBCUtils.getConnection();
                list.add(conn);
            }
        }
        Connection conn = list.remove(0);
        //增强连接，MyConnection里面有close归还连接操作。
        MyConnection myConnection = new MyConnection(conn,list);
        return myConnection;
        //return conn;
    }

//  public void addback(Connection conn) {
//      //归还连接
//      list.add(conn);
//  }

    @Override
    public PrintWriter getLogWriter() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setLogWriter(PrintWriter out) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public void setLoginTimeout(int seconds) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public int getLoginTimeout() throws SQLException {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public <T> T unwrap(Class<T> iface) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public Connection getConnection(String username, String password)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

}

MyConnection

package bull02.JDBCconnectionPool;

import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;
/**
 * 增强连接
 * @author 45度炸
 *
 */
public class MyConnection implements Connection {

    private Connection conn;
    private List<Connection> list;

    public MyConnection(Connection conn,List<Connection> list) {
        this.conn = conn;//导入外部的conn
        this.list = list;//导入外部的list
    }

    @Override
    public void close() throws SQLException {
        // TODO Auto-generated method stub
        list.add(conn);
    }

    @Override
    public <T> T unwrap(Class<T> iface) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public Statement createStatement() throws SQLException {
        // TODO Auto-generated method stub
        return conn.createStatement();
    }

    @Override
    public PreparedStatement prepareStatement(String sql) throws SQLException {
        // TODO Auto-generated method stub
        return conn.prepareStatement(sql);
    }

    @Override
    public CallableStatement prepareCall(String sql) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public String nativeSQL(String sql) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setAutoCommit(boolean autoCommit) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean getAutoCommit() throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void commit() throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public void rollback() throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean isClosed() throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public DatabaseMetaData getMetaData() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setReadOnly(boolean readOnly) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean isReadOnly() throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void setCatalog(String catalog) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public String getCatalog() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setTransactionIsolation(int level) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public int getTransactionIsolation() throws SQLException {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public SQLWarning getWarnings() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void clearWarnings() throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public Statement createStatement(int resultSetType, int resultSetConcurrency)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int resultSetType,
            int resultSetConcurrency) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public CallableStatement prepareCall(String sql, int resultSetType,
            int resultSetConcurrency) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Map<String, Class<?>> getTypeMap() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public void setHoldability(int holdability) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public int getHoldability() throws SQLException {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Savepoint setSavepoint() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Savepoint setSavepoint(String name) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void rollback(Savepoint savepoint) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public void releaseSavepoint(Savepoint savepoint) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public Statement createStatement(int resultSetType,
            int resultSetConcurrency, int resultSetHoldability)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int resultSetType,
            int resultSetConcurrency, int resultSetHoldability)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public CallableStatement prepareCall(String sql, int resultSetType,
            int resultSetConcurrency, int resultSetHoldability)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int[] columnIndexes)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public PreparedStatement prepareStatement(String sql, String[] columnNames)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Clob createClob() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Blob createBlob() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public NClob createNClob() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public SQLXML createSQLXML() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public boolean isValid(int timeout) throws SQLException {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void setClientInfo(String name, String value)
            throws SQLClientInfoException {
        // TODO Auto-generated method stub

    }

    @Override
    public void setClientInfo(Properties properties)
            throws SQLClientInfoException {
        // TODO Auto-generated method stub

    }

    @Override
    public String getClientInfo(String name) throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Properties getClientInfo() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Array createArrayOf(String typeName, Object[] elements)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Struct createStruct(String typeName, Object[] attributes)
            throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void setSchema(String schema) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public String getSchema() throws SQLException {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void abort(Executor executor) throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public void setNetworkTimeout(Executor executor, int milliseconds)
            throws SQLException {
        // TODO Auto-generated method stub

    }

    @Override
    public int getNetworkTimeout() throws SQLException {
        // TODO Auto-generated method stub
        return 0;
    }



}