问题描述
我的 Iphone 应用程序有问题.有一段时间我的应用程序运行成功,但在某些情况下它会给出数据库被锁定异常",这就是为什么我无法从 sqlite 数据库读取或插入数据的原因.如果有人有解决方案,请建议我.这是我将数据插入数据库的代码谢谢.
I have a problem in my Iphone application.Some time my Application run successfully,But in some cases it give "databse is locked exception"thats why i am unable to read or insert data from sqlite datase.Please suggest me if any one have some solution.This is my code of inserting data into databseThanks.
-(void)insertDataIntoDatabase
{
NSLog(@"insertDataIntoDatabase-----1");
@try{
tUserName=userNameTf.text;
tLevel=[NSString stringWithFormat:@"%d",level];
tMoves=[NSString stringWithFormat:@"%d",moves];
NSLog(@"tLevel;;;%@",tLevel);
// NSString *tdatabaseName = @"FlipScoreBord.sqlite";
sqlite3_stmt *addStatement;
// NSArray *tdocumentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
// NSString *tdocumentsDir = [tdocumentPaths objectAtIndex:0];
// NSString *tdatabasePath = [tdocumentsDir stringByAppendingPathComponent:tdatabaseName];
NSString *insertQuery = [NSString stringWithFormat:@"INSERT INTO Moves (User_Name,User_Label,User_Moves) VALUES('%@','%@','%@')",tUserName,tLevel,tMoves];
const char *sql = [insertQuery cStringUsingEncoding:NSUTF8StringEncoding];
if(sqlite3_prepare_v2(tdatabase, sql, -1, &addStatement, NULL) != SQLITE_OK)
{
NSAssert1(0, @"Error while creating add statement. '%s'", sqlite3_errmsg(tdatabase));
}
sqlite3_bind_text(addStatement, 0, [tUserName UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(addStatement, 1, [tLevel UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(addStatement, 2, [tUserName UTF8String], -1, SQLITE_TRANSIENT);
if(SQLITE_DONE != sqlite3_step(addStatement))
{
NSAssert1(0, @"Error while inserting data. '%s'", sqlite3_errmsg(tdatabase));
sqlite3_reset(addStatement);
}
sqlite3_close(tdatabase);
}
@catch (NSException *r)
{
NSLog(@"Exception---- %@",r);
}
NSLog(@"insertDataIntoDatabase-----2");
}
推荐答案
此链接列出了触发数据库锁定错误的原因:
This link lists the reasons how a database lock error can be triggered:
http://www.sqlite.org/cvstrac/wiki?p=DatabaseIsLocked
引用原因之一:
当 SELECT 在同一个表上处于活动状态时尝试写入该表.
由于您没有在您的语句中调用 sqlite3_finalize,有可能之前的 'SELECT' 语句阻塞了您的 'INSERT'.在调用 sqlite3_close 之前尝试添加一个 sqlite3_finalize.
Since you did not call the sqlite3_finalize on your statement, it is possible that a previous 'SELECT' statement is blocking your 'INSERT'. Try adding an sqlite3_finalize before you call the sqlite3_close.
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