Android實現建立或升級資料庫時執行語句_Android

本文執行個體講述了Android建立或升級資料庫時執行的語句，如果是建立或升級資料庫，請使用帶List參數的構造方法，帶SQL語句的構造方法將在資料庫建立或升級時執行。

具體程式碼如下：

import java.util.List;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteDatabase.CursorFactory;import android.database.sqlite.SQLiteOpenHelper;public class SimpleSQLiteOpenHelper extends SQLiteOpenHelper { private static final int INIT_VERSION = 1; /** * 建立或升級資料庫時執行的語句。 */ private List<String> sqlStatementExed; /** * 如果是建立或升級資料庫，請使用帶List參數的構造方法。 *  * @param context *      to use to open or create the database * @param name *      of the database file, or null for an in-memory database * @param factory *      to use for creating cursor objects, or null for the default * @param version *      number of the database (starting at 1); if the database is *      older, onUpgrade(SQLiteDatabase, int, int) will be used to *      upgrade the database; if the database is newer, *      onDowngrade(SQLiteDatabase, int, int) will be used to *      downgrade the database */ public SimpleSQLiteOpenHelper(Context context, String name,  CursorFactory factory, int version) { super(context, name, factory, version); sqlStatementExed = null; } /** * 帶SQL語句的構造方法。此SQL語句將在資料庫建立或升級時執行。 *  * @param context *      to use to open or create the database * @param name *      of the database file, or null for an in-memory database * @param factory *      to use for creating cursor objects, or null for the default * @param version *      number of the database (starting at 1); if the database is *      older, onUpgrade(SQLiteDatabase, int, int) will be used to *      upgrade the database; if the database is newer, *      onDowngrade(SQLiteDatabase, int, int) will be used to *      downgrade the database * @param sqlStatementExed *      在資料庫建立或升級的時候將執行的語句。 */ public SimpleSQLiteOpenHelper(Context context, String name,  CursorFactory factory, int version, List<String> sqlStatementExed) { super(context, name, factory, version); this.sqlStatementExed = sqlStatementExed; } /** * 如果是建立或升級資料庫，請使用帶List參數的構造方法。 * @param context *      to use to open or create the database * @param name *      of the database file, or null for an in-memory database * @param version *      number of the database (starting at 1); if the database is *      older, onUpgrade(SQLiteDatabase, int, int) will be used to *      upgrade the database; if the database is newer, *      onDowngrade(SQLiteDatabase, int, int) will be used to *      downgrade the database */ public SimpleSQLiteOpenHelper(Context context, String name, int version) { super(context, name, null, version); sqlStatementExed = null; } /** * 如果是建立或升級資料庫，請使用帶List參數的構造方法。 * @param context *      to use to open or create the database * @param name *      of the database file, or null for an in-memory database */ public SimpleSQLiteOpenHelper(Context context, String name) { super(context, name, null, INIT_VERSION); sqlStatementExed = null; } /** * 如果是建立或升級資料庫，請使用帶List參數的構造方法。 *  * @param context *      to use to open or create the database * @param name *      of the database file, or null for an in-memory database * @param version *      number of the database (starting at 1); if the database is *      older, onUpgrade(SQLiteDatabase, int, int) will be used to *      upgrade the database; if the database is newer, *      onDowngrade(SQLiteDatabase, int, int) will be used to *      downgrade the database * @param sqlCreateStatement *      在建立或升級資料庫時要執行的語句。 */ public SimpleSQLiteOpenHelper(Context context, String name, int version,  List<String> sqlCreateStatement) { super(context, name, null, version); this.sqlStatementExed = sqlCreateStatement; } /** * @param context * @param name * @param sqlCreateStatement *      在建立或升級資料庫時要執行的語句。 */ public SimpleSQLiteOpenHelper(Context context, String name,  List<String> sqlCreateStatement) { super(context, name, null, INIT_VERSION); this.sqlStatementExed = sqlCreateStatement; } /* * (non-Javadoc) * @see * android.database.sqlite.SQLiteOpenHelper#onCreate(android.database.sqlite * .SQLiteDatabase) */ @Override @Deprecated public void onCreate(SQLiteDatabase db) { exeSqlStatementExed(db); } /* * (non-Javadoc) * @see * android.database.sqlite.SQLiteOpenHelper#onUpgrade(android.database.sqlite * .SQLiteDatabase, int, int) */ @Override @Deprecated public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { if (newVersion > oldVersion) {  exeSqlStatementExed(db); } } /** * 初始化或升級資料庫時執行的SQL語句。。 */ private void exeSqlStatementExed(SQLiteDatabase db) { if (sqlStatementExed != null) {  for (String statement : sqlStatementExed) {  db.execSQL(statement);  } } }}

希望本文所述方法對於大家進行Android程式開發能夠起到一定的協助作用。