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//
// dbTest_sqliteViewController.m
// dbTest_sqlite
//
// Created by lv wei on 13-4-23.
// Copyright (c) 2013年 kAir. All rights reserved.
//
#import "dbTest_sqliteViewController.h"
#import <sqlite3.h>
static NSString* const KDBFileName = @"dbFile.db";
@interface QStudent : NSObject
@property(nonatomic, retain)NSString* svid;
@property(nonatomic, retain)NSString* name;
@property(nonatomic, retain)NSString* sex;
@property(nonatomic, assign)NSUInteger age;
@end
@implementation QStudent
@synthesize svid = _svid;
@synthesize name = _name;
@synthesize sex = _sex;
@synthesize age = _age;
- (void)dealloc
{
[_svid release];
[_name release];
[_sex release];
[super dealloc];
}
@end
@interface dbTest_sqliteViewController ()
{
sqlite3* _database;
}
@property(nonatomic, retain)NSString* dbFileFullPath;
@end
@implementation dbTest_sqliteViewController
@synthesize dbFileFullPath = _dbFileFullPath;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self dbFileCreate];
[self dbFileOpen];
[self createStudentTable];
[self insertRecords1];
[self showCurAllRecord];
[self insertRecords2];
[self showCurAllRecord];
[self deleteRecordBySvid:@"030341311"];
[self showCurAllRecord];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)dealloc
{
[_dbFileFullPath release];
if (_database) {
sqlite3_close(_database);
_database = NULL;
}
[super dealloc];
}
- (void)dbFileCreate
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
if ([paths count] > 0) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"myDbFile"];
NSFileManager* fm = [NSFileManager defaultManager];
if (![fm fileExistsAtPath:path]) {
[fm createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];
}
self.dbFileFullPath = [path stringByAppendingFormat:@"/%@",KDBFileName];
if (![fm fileExistsAtPath:_dbFileFullPath]) {
[fm createFileAtPath:_dbFileFullPath contents:nil attributes:nil];
}
NSLog(@"filePath = %@",_dbFileFullPath);
}
}
- (void)dbFileOpen
{
int res = sqlite3_open([_dbFileFullPath UTF8String], &_database);
if (res != SQLITE_OK) {
sqlite3_close(_database);
_database = NULL;
}
}
- (BOOL) createStudentTable{
char *sql = "CREATE TABLE student(id integer primary key, \
svid text,\
name text, \
sex text, \
age integer)";
char *errorMsg;
int success = sqlite3_exec(_database, sql, NULL,NULL,&errorMsg);
if (success == SQLITE_OK) {
NSLog(@"create table student ok!");
return YES;
}
else
{
NSLog(@"create table student fail!");
return NO;
}
}
//插入学生记录1
- (void)insertRecords1
{
const int KArrayLen = 4;
NSArray* svidList = [NSArray arrayWithObjects:@"030341318",@"030341311",@"030341309",@"030341120", nil];
NSArray* nameList = [NSArray arrayWithObjects:@"ksnow", @"ksnowlv",@"kAir",@"ksnowk",nil];
NSArray* sexList = [NSArray arrayWithObjects:@"女", @"男",@"男",@"女",nil];
int ageList[KArrayLen] = {28,25,32,12};
for (int i = 0; i < KArrayLen; ++i) {
QStudent* student = [[QStudent alloc] init];
student.svid = [svidList objectAtIndex:i];
student.name = [nameList objectAtIndex:i];
student.sex = [sexList objectAtIndex:i];
student.age = ageList[i];
if (![self findRecordBySVid:student.svid]) {
[self createStudentRecord:student];
}
else
{
[self updateRecord:student];
}
[student release];
}
}
//插入学生记录2
- (void)insertRecords2
{
const int KArrayLen = 4;
NSArray* svidList = [NSArray arrayWithObjects:@"030341318",@"030341300",@"030341301",@"030341302", nil];
NSArray* nameList = [NSArray arrayWithObjects:@"ksnowlv", @"学生1",@"学生2",@"学生3",nil];
NSArray* sexList = [NSArray arrayWithObjects:@"男", @"男",@"男",@"女",nil];
int ageList[KArrayLen] = {29,25,32,12};
for (int i = 0; i < KArrayLen; ++i) {
QStudent* student = [[QStudent alloc] init];
student.svid = [svidList objectAtIndex:i];
student.name = [nameList objectAtIndex:i];
student.sex = [sexList objectAtIndex:i];
student.age = ageList[i];
if (![self findRecordBySVid:student.svid]) {
[self createStudentRecord:student];
}
else
{
[self updateRecord:student];
}
[student release];
}
}
//创建学生的记录
- (BOOL)createStudentRecord:(QStudent*)student{
sqlite3_stmt *statement;
static char *sql = "INSERT INTO student (svid,name,sex,age)\
VALUES(?,?,?,?)";
//问号的个数要和(svid,name,sex,age)里面字段的个数匹配，代表未知的值，将在下面将值和字段关联。
int success = sqlite3_prepare_v2(_database, sql, -1, &statement, NULL);
if (success != SQLITE_OK) {
NSLog(@"Error: failed to insert:channels");
return NO;
}
//这里的数字1，2，3，4代表第几个问号
sqlite3_bind_text(statement, 1,student.svid.UTF8String, -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 2, student.name.UTF8String, -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 3, student.sex.UTF8String, -1, SQLITE_TRANSIENT);
sqlite3_bind_int(statement, 4, student.age);
success = sqlite3_step(statement);
sqlite3_finalize(statement);
if (success == SQLITE_ERROR) {
NSLog(@"Error: failed to insert into the database with message.");
return NO;
}
NSLog(@"insert student svid = %@, name = %@,sex = %@,age=%d",
student.svid,student.name,student.sex,student.age);
return YES;
}
//显示所有学生的记录
- (void)showCurAllRecord
{
NSLog(@"start showAllRecord");
NSString* sqlString = [NSString stringWithFormat:@"SELECT * FROM student"];
sqlite3_stmt *statement = nil;
int res = sqlite3_prepare_v2(_database, [sqlString UTF8String], -1, &statement, NULL);
if ( res != SQLITE_OK) {
NSLog(@"Error: failed to prepare statement with message:get student.");
}
//查询结果集中一条一条的遍历所有的记录，这里的数字对应的是列值。
while (sqlite3_step(statement) == SQLITE_ROW) {
char* svid = (char*)sqlite3_column_text(statement, 1);
char* name = (char*)sqlite3_column_text(statement, 2);
char* sex = (char*)sqlite3_column_text(statement, 3);
int age = sqlite3_column_int(statement, 4);
NSString* studentSvid = [[NSString alloc] initWithCString:svid encoding:NSUTF8StringEncoding];
NSString* studentName = [[NSString alloc] initWithCString:name encoding:NSUTF8StringEncoding];
NSString* studentSex = [[NSString alloc] initWithCString:sex encoding:NSUTF8StringEncoding];
NSLog(@"student svid = %@, name = %@,sex = %@,age=%d",
studentSvid,studentName,studentSex,age);
[studentSvid release];
[studentName release];
[studentSex release];
}
sqlite3_finalize(statement);
NSLog(@"complete showAllRecord");
}
//查询是否存在该SVID的记录？
- (BOOL) findRecordBySVid:(NSString*)svid{
NSString* sqlString = [NSString stringWithFormat:@"SELECT * FROM student where svid == \"%@\";",svid];
sqlite3_stmt *statement = nil;
int res = sqlite3_prepare_v2(_database, [sqlString UTF8String], -1, &statement, NULL);
if ( res != SQLITE_OK) {
NSLog(@"Error: failed to prepare statement with message:get student.");
}
BOOL isExistRecord = NO;
//查询结果集中一条一条的遍历所有的记录，这里的数字对应的是列值。
while (YES) {
res = sqlite3_step(statement);
if (res == SQLITE_ROW) {
char* svid = (char*)sqlite3_column_text(statement, 1);
char* name = (char*)sqlite3_column_text(statement, 2);
char* sex = (char*)sqlite3_column_text(statement, 3);
int age = sqlite3_column_int(statement, 4);
NSString* studentSvid = [[NSString alloc] initWithCString:svid encoding:NSUTF8StringEncoding];
NSString* studentName = [[NSString alloc] initWithCString:name encoding:NSUTF8StringEncoding];
NSString* studentSex = [[NSString alloc] initWithCString:sex encoding:NSUTF8StringEncoding];
NSLog(@"query student svid = %@, name = %@,sex = %@,age=%d",
studentSvid,studentName,studentSex,age);
[studentSvid release];
[studentName release];
[studentSex release];
isExistRecord = YES;
break;
}
else
{
break;
}
}
sqlite3_finalize(statement);
return isExistRecord;
}
//在查询存在该SVID的记录时，更新记录
- (BOOL)updateRecord:(QStudent*)student
{
NSString* updateSQLString =[NSString stringWithFormat:@"update student set name= \"%@\", sex=\"%@\",age=%d where svid=\"%@\"",student.name,student.sex,student.age,student.svid];
char *errMsg = NULL;
int res = sqlite3_exec(_database, [updateSQLString UTF8String], NULL, NULL, &errMsg);
if(res ==SQLITE_OK){
NSLog(@"更新成功!");
return YES;
}
else
{
NSLog(@"更新失败!");
return NO;
}
}
//在查询存在该SVID的记录时，更新记录
- (BOOL)deleteRecordBySvid:(NSString*)svid
{
NSString* updateSQLString =[NSString stringWithFormat:@"delete from student where svid=\"%@\"",svid];
char *errMsg = NULL;
int res = sqlite3_exec(_database, [updateSQLString UTF8String], NULL, NULL, &errMsg);
if(res ==SQLITE_OK){
NSLog(@"删除成功!");
return YES;
}
else
{
NSLog(@"删除失败!");
return NO;
}
}
@end
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