Android中使用Ormlite实现持久化(二)--持久化类的详细配置

openkk 13年前
     <p><a href="http://www.open-open.com/lib/view/open1325323603780.html" target="_blank">上一篇</a>文章简单的使用了Ormlite一下,但是我觉得Ormlite出色之处就是对于需要字段,表等等的配置设计的比较好。</p>    <p>下面来说说类的配置:</p>    <p>如果我们开发的Android应用需要保持用户信息,那么现在新建一个类:UserAccount</p>    <p>该类有六个变量:</p>    <pre class="brush:java; toolbar: true; auto-links: false;">    private int id;      private String username;      private String password;      private Date regTime;      private String tellphone;      private String email;</pre>用eclipse生成get和set方法:    <pre class="brush:java; toolbar: true; auto-links: false;">public int getId() {          return id;      }      public void setId(int id) {          this.id = id;      }      public String getUsername() {          return username;      }      public void setUsername(String username) {          this.username = username;      }      public String getPassword() {          return password;      }      public void setPassword(String password) {          this.password = password;      }      public Date getRegTime() {          return regTime;      }      public void setRegTime(Date regTime) {          this.regTime = regTime;      }      public String getTellphone() {          return tellphone;      }      public void setTellphone(String tellphone) {          this.tellphone = tellphone;      }      public String getEmail() {          return email;      }      public void setEmail(String email) {          this.email = email;      }</pre>    <p></p>    <p>下面通过注解的方式配置该类的持久化参数:</p>    <p>1.表名:</p>    <div class="cnblogs_code">     <pre>@DatabaseTable(tableName="dataTableName")</pre>    </div>    <p>不指定的话表名就是类名。</p>    <p>2.字段</p>    <div class="cnblogs_code">     <pre>@DatabaseField</pre>    </div>    <p>这个可以配置的属性有点多。</p>    <p>2.1 主键</p>    <div class="cnblogs_Highlighter">     <pre class="brush:java;gutter:false;">@DatabaseField(id=true)</pre>    </div>    <p>2.2 列名</p>    <div class="cnblogs_Highlighter">     <pre class="brush:java;gutter:false;">@DatabaseField(columnName="columnName")</pre>    </div>    <p>不指定的话就是和变量名一样的</p>    <p>2.3 数据类型</p>    <div class="cnblogs_Highlighter">     <pre class="brush:java;gutter:false;">@DatabaseField(dataType=DataType.INTEGER)</pre>    </div>    <p>这个一般情况下都不用指定,可以根据java 类获得</p>    <p>2.4 默认值</p>    <div class="cnblogs_Highlighter">     <pre class="brush:java;gutter:false;">@DatabaseField(defaultValue="http://www.www.open-open.com/")</pre>    </div>    <p>2.5 长度</p>    <div class="cnblogs_Highlighter">     <pre class="brush:java;gutter:false;">@DatabaseField(width=13)</pre>    </div>    <p>一般用于String型</p>    <p>2.6 能否为空</p>    <div class="cnblogs_Highlighter">     <pre class="brush:java;gutter:false;">@DatabaseField(canBeNull=false)</pre>    </div>    <p>默认为True</p>    <p>2.7 是否自增长</p>    <div class="cnblogs_Highlighter">     <pre class="brush:java;gutter:false;">@DatabaseField(generatedId=true)</pre>    </div>    <p></p>