sqlite数据库更新

Question

我正在使用下面的代码来更新sqlite中我的表中的条目。不要干涉其他列只需编辑一个余额。但它给我的database.Can有人没有变化帮助我在这里..

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsPath = [paths objectAtIndex:0]; 
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"Accounts.sqlite"]; 

sqlite3 *database; 
sqlite3_stmt *updateStmt; 
if(sqlite3_open([filePath UTF8String], &database) == SQLITE_OK) 
{ 
    const char *sql = "update Account Set currentBalance = ? Where ID = ?"; 
    if(sqlite3_prepare_v2(database, sql, -1, &updateStmt, NULL) != SQLITE_OK) 
     NSAssert1(0, @"Error while creating update statement. '%s'", sqlite3_errmsg(database)); 
} 
sqlite3_bind_int(updateStmt, 1, 1000); 

sqlite3_bind_int(updateStmt, 2 , 1); 
sqlite3_finalize(updateStmt); 


    if(SQLITE_DONE != sqlite3_step(updateStmt)) 
     NSAssert1(0, @"Error while updating. '%s'", sqlite3_errmsg(database)); 
sqlite3_finalize(updateStmt); 


sqlite3_close(database); 

Answer 1

做到这一点...

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsPath = [paths objectAtIndex:0]; 
NSString *filePath = [documentsPath stringByAppendingPathComponent:@"Accounts.sqlite"]; 
//NSString *filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"Accounts.sqlite"]; 
sqlite3 *database; 
sqlite3_stmt *updateStmt; 
if(sqlite3_open([filePath UTF8String], &database) == SQLITE_OK) 
{ 
    const char *sql = "update Account Set currentBalance = ? Where ID = ?"; 
    if(sqlite3_prepare_v2(database, sql, -1, &updateStmt, NULL) != SQLITE_OK) 
     NSLog(@"Error while creating update statement. %s", sqlite3_errmsg(database)); 
} 
sqlite3_bind_int(updateStmt, 1, 1000); 

sqlite3_bind_int(updateStmt, 2 , 1); 


char* errmsg; 
sqlite3_exec(database, "COMMIT", NULL, NULL, &errmsg); 

if(SQLITE_DONE != sqlite3_step(updateStmt)) 
    NSLog(@"Error while updating. %s", sqlite3_errmsg(database)); 
sqlite3_finalize(updateStmt); 


sqlite3_close(database);