利用连接池对MySql数据库连接处理

 
MySql数据库的处理连接：

public class DBManager {
   
    private static String username;
    private static String password;
    private static String url;
    private static String driver;
   
    static{
       try{
           InputStream in = DBManager.class.getClassLoader().getResourceAsStream("db.properties");
           Properties prop = new Properties();
           prop.load(in);
          
           driver = prop.getProperty("driverClassName");
           url = prop.getProperty("url");
          
           username = prop.getProperty("username");
           password = prop.getProperty("password");
          
           Class.forName(driver);
          
       }catch (Exception e) {
           throw new ExceptionInInitializerError(e);
       }
    }
   
   
    public static Connection getConnection()
throws SQLException{
       return DriverManager.getConnection(url,
username, password);
    }
   
   
    public static void release(Connection conn,Statement st,ResultSet rs){
      
       if(rs!=null){
           try{
              rs.close();
           }catch (Exception e) {e.printStackTrace();}
            rs = null;
       }
       if(st!=null){
           try{
              st.close();
           }catch (Exception e) {e.printStackTrace();}
           st = null;
       }
       if(conn!=null){
           try{
              conn.close();
           }catch (Exception e) {e.printStackTrace();}
           conn = null;
       }
      
    }
   
}

 

配置文件的编写模板：

#\u8FDE\u63A5\u8BBE\u7F6E
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/jdbc
username=root
password=123
 
#<!-- \u521D\u59CB\u5316\u8FDE\u63A5 -->
initialSize=5
 
#\u6700\u5927\u8FDE\u63A5\u6570\u91CF
maxActive=5
 
#<!-- \u6700\u5927\u7A7A\u95F2\u8FDE\u63A5 -->
maxIdle=20
 
#<!-- \u6700\u5C0F\u7A7A\u95F2\u8FDE\u63A5 -->
minIdle=5
 
#<!-- \u8D85\u65F6\u7B49\u5F85\u65F6\u95F4\u4EE5\u6BEB\u79D2\u4E3A\u5355\u4F4D 60000\u6BEB\u79D2/1000\u7B49\u4E8E60\u79D2 -->
maxWait=3000
 
 
#JDBC\u9A71\u52A8\u5EFA\u7ACB\u8FDE\u63A5\u65F6\u9644\u5E26\u7684\u8FDE\u63A5\u5C5E\u6027\u5C5E\u6027\u7684\u683C\u5F0F\u5FC5\u987B\u4E3A\u8FD9\u6837\uFF1A[\u5C5E\u6027\u540D=property;]

#\u6CE8\u610F\uFF1A"user" \u4E0E "password" \u4E24\u4E2A\u5C5E\u6027\u4F1A\u88AB\u660E\u786E\u5730\u4F20\u9012\uFF0C\u56E0\u6B64\u8FD9\u91CC\u4E0D\u9700\u8981\u5305\u542B\u4ED6\u4EEC\u3002
connectionProperties=useUnicode=true;characterEncoding=UTF-8
 
#\u6307\u5B9A\u7531\u8FDE\u63A5\u6C60\u6240\u521B\u5EFA\u7684\u8FDE\u63A5\u7684\u81EA\u52A8\u63D0\u4EA4\uFF08auto-commit\uFF09\u72B6\u6001\u3002
defaultAutoCommit=true
 
#driver default \u6307\u5B9A\u7531\u8FDE\u63A5\u6C60\u6240\u521B\u5EFA\u7684\u8FDE\u63A5\u7684\u53EA\u8BFB\uFF08read-only\uFF09\u72B6\u6001\u3002
#\u5982\u679C\u6CA1\u6709\u8BBE\u7F6E\u8BE5\u503C\uFF0C\u5219\u201CsetReadOnly\u201D\u65B9\u6CD5\u5C06\u4E0D\u88AB\u8C03\u7528\u3002\uFF08\u67D0\u4E9B\u9A71\u52A8\u5E76\u4E0D\u652F\u6301\u53EA\u8BFB\u6A21\u5F0F\uFF0C\u5982\uFF1AInformix\uFF09
defaultReadOnly=
 
#driver default \u6307\u5B9A\u7531\u8FDE\u63A5\u6C60\u6240\u521B\u5EFA\u7684\u8FDE\u63A5\u7684\u4E8B\u52A1\u7EA7\u522B\uFF08TransactionIsolation\uFF09\u3002
#\u53EF\u7528\u503C\u4E3A\u4E0B\u5217\u4E4B\u4E00\uFF1A\uFF08\u8BE6\u60C5\u53EF\u89C1javadoc\u3002\uFF09NONE,READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE
defaultTransactionIsolation=READ_UNCOMMITTED