Android实现创建或升级数据库时执行语句_Android

本文实例讲述了Android创建或升级数据库时执行的语句，如果是创建或升级数据库，请使用带List参数的构造方法，带SQL语句的构造方法将在数据库创建或升级时执行。

具体程序代码如下：

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;
 /**
 * 创建或升级数据库时执行的语句。
 */
 private List<String> sqlStatementExed;
 /**
 * 如果是创建或升级数据库，请使用带List参数的构造方法。
 *
 * @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;
 }
 /**
 * 带SQL语句的构造方法。此SQL语句将在数据库创建或升级时执行。
 *
 * @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
 *      在数据库创建或升级的时候将执行的语句。
 */
 public SimpleSQLiteOpenHelper(Context context, String name,
  CursorFactory factory, int version, List<String> sqlStatementExed) {
 super(context, name, factory, version);
 this.sqlStatementExed = sqlStatementExed;
 }
 /**
 * 如果是创建或升级数据库，请使用带List参数的构造方法。
 * @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;
 }
 /**
 * 如果是创建或升级数据库，请使用带List参数的构造方法。
 * @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;
 }
 /**
 * 如果是创建或升级数据库，请使用带List参数的构造方法。
 *
 * @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
 *      在创建或升级数据库时要执行的语句。
 */
 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
 *      在创建或升级数据库时要执行的语句。
 */
 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);
 }
 }
 /**
 * 初始化或升级数据库时执行的SQL语句。。
 */
 private void exeSqlStatementExed(SQLiteDatabase db) {
 if (sqlStatementExed != null) {
  for (String statement : sqlStatementExed) {
  db.execSQL(statement);
  }
 }
 }
}

希望本文所述方法对于大家进行Android程序开发能够起到一定的帮助作用。

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