android 中sqlite判断表或视图是否存在

最新推荐文章于 2023-05-07 17:23:14 发布

zhanglipingzlp

最新推荐文章于 2023-05-07 17:23:14 发布

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本文链接：https://blog.youkuaiyun.com/zhanglipingzlp/article/details/38080529

本文提供了一种方法来检查SQLite数据库中特定的表或视图是否存在。通过构造SQL查询语句并使用SQLite的rawQuery方法，可以有效地确定指定名称的表或视图是否存在。

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/**
* 判断某张表是否存在
*
* @param tabName
* 表名
* @return
*/
public boolean IsExistTable(String TableName) {
boolean result = false;
if (TableName == null) {
return false;
}
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = this.getReadableDatabase();

String sql = "select count(*) as c from Sqlite_master where type ='table' and name ='"
+ TableName.trim() + "' ";

cursor = db.rawQuery(sql, null);

if (cursor.moveToNext()) {

int count = cursor.getInt(0);

if (count > 0) {
result = true;
}
}

} catch (Exception e) {

}finally{
closeCursor(cursor);
db.close();
}

//System.out.println("表是否存在---"+result);
return result;
}

/**
* 判断视图是否已存在
* @param viewName 视图的名字
* @return
* @author JL
* @create 2011-5-20
*/
public boolean IsExistView(String viewName) {
boolean result = false;
if (viewName == null) {
return false;
}
SQLiteDatabase db = null;
Cursor cursor = null;
try {
db = this.getReadableDatabase();

String sql = "select count(*) as c from Sqlite_master where type ='view' and name ='"
+ viewName.trim() + "' ";

cursor = db.rawQuery(sql, null);

if (cursor.moveToNext()) {

int count = cursor.getInt(0);

if (count > 0) {
result = true;
}
}

} catch (Exception e) {
e.printStackTrace();
}finally{
closeCursor(cursor);
db.close();
}
return result;
}