如何從適用於iPhone的SQLite中刪除記錄

Question

如何從SQLite數據庫中刪除所有記錄。

 +(BOOL)deleteFromtbl {
        sqlite3 *database;
        BOOL retValue = YES;
        if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
            const char *sqlStatement = "Delete from tbl";
            sqlite3_stmt *compiledStatement;
            retValue = sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL);
            sqlite3_finalize(compiledStatement);
        }
        sqlite3_close(database);

        return retValue;        
    }

這些代碼對我不起作用。

提前致謝。

Answer 1

sqlite3_step，這個函數在准備好編譯語句后需要。

以這種方式使用

+(BOOL)deleteFromtbl {
        sqlite3 *database;
        BOOL retValue = YES;
        if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
            const char *sqlStatement = "Delete from tbl";
            sqlite3_stmt *compiledStatement;
            retValue = sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL);
if(SQLITE_DONE != sqlite3_step(compiledStatement))//add this line
    {
        NSLog(@"Error while inserting data. '%s'", sqlite3_errmsg(database));
        return NO;
    }
            sqlite3_finalize(compiledStatement);
        }
        sqlite3_close(database);

        return retValue;        
    }