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@ZeroGeek 2015-10-21T09:06:33.000000Z 字数 1294 阅读 634

SQLite用法整理

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介绍

目前Android中最新SQLite为3.4.0版本。

相关类说明

类名 说明
SQLiteClosable An object created from a SQLiteDatabase that can be closed.
SQLiteCursor A Cursor implementation that exposes results from a query on a SQLiteDatabase.
SQLiteDatabase Exposes methods to manage a SQLite database.
SQLiteOpenHelper A helper class to manage database creation and version management.
SQLiteProgram A base class for compiled SQLite programs.
SQLiteQuery Represents a query that reads the resulting rows into a SQLiteQuery.
SQLiteQueryBuilder This is a convience class that helps build SQL queries to be sent to SQLiteDatabase objects.
SQLiteStatement Represents a statement that can be executed against a database.

正确使用事务

SQLiteDatabase db; // db的声明

  1.    db.beginTransaction();
  2.    try {
  3.      ...
  4.      db.setTransactionSuccessful();
  5.    } finally {
  6.      db.endTransaction();
  7.    }

正确查询

  1.     private String getCategoryNameById(long id){
  2.         String querySql = "select name from t_category where  categoryPOID = ?  and depth = 2";
  3.         String[] args = {
  4.                 String.valueOf(id),
  5.         };
  6.         Cursor c = null;
  7.         String name = "";
  8.         try {
  9.             c = db.rawQuery(querySql, args);
  10.             if(c.moveToFirst()){
  11.                 name = c.getString(c.getColumnIndex("name"));
  12.             }
  13.         } finally {
  14.             closeCursor(c);
  15.         }
  16.         return name;
  17.     }
  19.     /**
  20.      * 释放游标
  21.      */
  22.     protected void closeCursor(Cursor c) {
  23.         if (c != null) {
  24.             if (!c.isClosed()) {
  25.                 c.close();
  26.                 c = null;
  27.             }
  28.         } 
  29.     }

http://androiddoc.qiniudn.com/reference/android/database/sqlite/package-summary.html
http://androiddoc.qiniudn.com/reference/android/database/sqlite/SQLiteDatabase.html

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