Android 判断数据库中是否存在某个表

 </pre><p style="margin-top:0px; margin-bottom:0px; padding-top:0px; padding-bottom:0px; font-family:Arial; font-size:14px; line-height:26px"><pre name="code" class="java">public boolean tableIsExist(String tabName, SQLiteDatabase db) {
         boolean result = false;
         if (tabName == null) {
             return false;
         }
         Cursor cursor = null;
         try {

             String sql = "select count(*) as c from sqlite_master where type ='table' and name ='" + tabName.trim() + "' ";
             cursor = db.rawQuery(sql, null);
             if (cursor.moveToNext()) {
                 int count = cursor.getInt(0);
                 if (count > 0) {
                     result = true;
                 }
             }

         } catch (Exception e) {
             // TODO: handle exception
         }
         return result;
     }

对sqlite_master表查询不但可以得到建表的sql语句，还可以获取该数据库内的trigger信息

 

而在纯java环境下对SQL数据库查询是否目标表格存在的时候可以更简单：

 java.sql.Connection con = getYourConnection();

 ResultSet rs = con.getMetaData().getTables(null, null, "yourTable", null );
 if (rs.next()) {
 //yourTable exist
 }else {
 //yourTable not exist
 }