sqlite操作与封装的示例分析

发布时间：2022-01-15 09:47:13 来源：亿速云阅读：134 作者：小新栏目：数据库

小编给大家分享一下sqlite操作与封装的示例分析，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

ocsqlite.h

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//
// OCSqlite.m
// sqlite
//
// Created by fengsh on 12-12-3.
// Copyright (c) 2012年 sqlite_Lib. All rights reserved.
//
/*
对ＳＱＬＩＴＥ的封装，主要设计是操作上的习惯。对于轻量级数据量可以。
对于在数据量就需要注意内存的开销了。
*/
#import <Foundation/Foundation.h>
#import <sqlite3.h>
enum fieldtype
{
ftInt,ftFloat,ftDouble,ftString,ftBlob,ftBool,ftDate,ftTime,ftDateTime,ftBinary
};
/*
字段类
作用：主要用于与数据库中的字段属性进行对应
字段名，字段类型，字段值，字段索引号
*/
@interface OCField : NSObject
{
NSString* fieldName;
id fieldValue;
enum fieldtype mtype;
int seq_column;
}
-(NSString*)toString;
-(NSInteger)toInteger;
-(NSDate*)toDate;
-(NSString*)toDateString;
-(NSString*)toTimeString;
-(NSString*)toDateTimeString;
-(NSNumber*)toNumber;
-(enum fieldtype)getFieldType;
@property (nonatomic) int seq_column;
@end
/*
数据集类
作用：
类似于数据源的集合，带游标，可访问数据源中的数据
*/
@interface OCDataset : NSObject
{
NSMutableArray* records;
NSInteger cursor;
}
-(void)clear;
-(NSInteger)count;
-(BOOL)next;
-(BOOL)first;
-(BOOL)move:(NSInteger) index;
-(OCField*)fieldbyname:(NSString*) fieldname;
-(OCField*)indexOffield:(NSInteger) index;
@end
/*
简单的数据定义语言操作及数据库查询的封装
未支持参数绑定，因此在处理blob上还需要扩展代码。
后续完善
*/
@interface OCSqlite : NSObject
{
sqlite3* db;
OCDataset* dataset;
}
-(id)init;
-(BOOL)ConnectToDB:(NSString*) dbfilepath;
-(void)DisconnectDB;
-(BOOL)startTranslation;
-(BOOL)commitTranslation;
-(BOOL)rollbackTranslation;
-(BOOL)excesql:(NSString*) ddlsql;
-(BOOL)query:(NSString*) qysql;
@property (nonatomic,readonly) OCDataset* dataset;
@end

ocsqlite.m

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//
// OCSqlite.m
// sqlite
//
// Created by fengsh on 12-12-3.
//
#import "OCSqlite.h"
@implementation OCField
@synthesize seq_column;
-(id)init
{
self = [super init];
if (self) {
fieldValue = NULL;
return self;
}
return nil;
}
-(void)setfield:(NSString*) name withvalue:(sqlite3_value*) value withtype:(NSString*) tp
{
fieldName = name;
NSString* result = @"";
if ([tp isEqualToString:@"integer"]||[tp isEqualToString:@"smallint"])
{
mtype = ftInt;
fieldValue = (id)sqlite3_value_int(value);
return;
}
else if ([tp isEqualToString:@"boolean"])
{
mtype = ftBool;
}
else if ([tp isEqualToString:@"float"])
{
mtype = ftFloat;
}
else if ([tp isEqualToString:@"double"]||[tp isEqualToString:@"real"])
{
mtype = ftDouble;
}
else if ([tp isEqualToString:@"text"]||[tp isEqualToString:@"varchar"])
{
mtype = ftString;
}
else if ([tp isEqualToString:@"blob"])
{
mtype = ftBlob;
return;
}
else if ([tp isEqualToString:@"date"])
{
mtype = ftDate;
}
else if ([tp isEqualToString:@"time"])
{
mtype = ftTime;
}
else if ([tp isEqualToString:@"timestamp"])
{
mtype = ftDateTime;
}
else if ([tp isEqualToString:@"binary"])
{
mtype = ftBinary;
return;
}
char* floatstr = (char*)sqlite3_value_text(value);
if (floatstr) {
result = [NSString stringWithCString:floatstr encoding:NSUTF8StringEncoding];
}
fieldValue = result;
}
-(NSString*)toString
{
return (NSString*)fieldValue;
}
-(NSInteger)toInteger
{
return (int)fieldValue;
}
-(NSNumber*)toNumber
{
switch (mtype) {
case ftFloat:
return [NSNumber numberWithFloat:[(NSString*)fieldValue floatValue]];
break;
case ftDouble:
return [NSNumber numberWithDouble:[(NSString*)fieldValue doubleValue]];
break;
case ftBool:
return [NSNumber numberWithBool:[(NSString*)fieldValue boolValue]];
break;
default:
return [NSNumber numberWithInt:[(NSString*)fieldValue intValue]];
break;
}
}
-(NSString*)toDateString
{
NSDateFormatter* fmt = [[[NSDateFormatter alloc]init]autorelease];
[fmt setDateFormat:@"yyyy-mm-dd"];
NSDate* date = [fmt dateFromString:fieldValue];
NSString* datestr = [fmt stringFromDate:date];
return (datestr==nil) ? @"":datestr;
}
-(NSString*)toTimeString
{
NSDateFormatter* fmt = [[[NSDateFormatter alloc]init]autorelease];
[fmt setDateFormat:@"HH:mm:ss"];//H为0－23，h为1-12
NSDate* time = [fmt dateFromString:fieldValue];
NSString* timestr = [fmt stringFromDate:time];
return (timestr==nil) ? @"":timestr;
}
-(NSString*)toDateTimeString;
{
NSDateFormatter* fmt = [[[NSDateFormatter alloc]init]autorelease];
[fmt setDateFormat:@"yyyy-MM-dd HH:mm:ss"];//H为0－23，h为1-12
NSDate* datetime = [fmt dateFromString:fieldValue];
NSString* dtimestr = [fmt stringFromDate:datetime];
return (dtimestr==nil) ? @"":dtimestr;
}
-(NSDate*)toDate
{
NSDateFormatter* fmt = [[NSDateFormatter alloc]init];
[fmt setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate* date = [fmt dateFromString:fieldValue];
return date;
}
-(enum fieldtype)getFieldType
{
return mtype;
}
@end
@implementation OCDataset
-(id)init
{
self = [super init];
if (self) {
cursor = -1;
records = [[NSMutableArray alloc]init];
return self;
}
return nil;
}
-(void)dealloc
{
[records release];
[super dealloc];
}
-(void)reset
{
cursor = 0;
}
-(void)fillData:(sqlite3_stmt*) cmd
{
NSInteger colcount = sqlite3_column_count(cmd);
NSMutableDictionary* fields = [[[NSMutableDictionary alloc]init]autorelease];
for (NSInteger i = 0; i < colcount; i++) {
char* fieldname = (char*)sqlite3_column_name(cmd, i);
NSString* strfieldname = [NSString stringWithCString:fieldname encoding:NSUTF8StringEncoding];
sqlite3_value* mvalue = sqlite3_column_value(cmd, i);
char* ity = (char*)sqlite3_column_decltype(cmd, i);
NSString* stype = [NSString stringWithCString:ity encoding:NSUTF8StringEncoding];
//int type = sqlite3_column_type(cmd, i);
OCField* field = [[OCField alloc]init];
[field setfield:strfieldname withvalue:mvalue withtype:stype];
field.seq_column = i;
[fields setObject:field forKey:strfieldname];
}
[records addObject:fields];
}
-(void)clear
{
[records removeAllObjects];
cursor = -1;
}
-(NSInteger)count
{
return [records count];
}
-(OCField*)fieldbyname:(NSString*) fieldname
{
NSMutableDictionary* dic = [records objectAtIndex:cursor];
return (OCField*)[dic objectForKey:fieldname];
}
-(BOOL)next
{
++cursor;
int rcount = [records count];
if (cursor <= rcount) {
return YES;
}
else
{
cursor = rcount+1;
return NO;
}
}
-(BOOL)first
{
if ([records count]>0) {
cursor = 0;
return YES;
}
else
{
cursor = -1;
return NO;
}
}
-(BOOL)move:(NSInteger) index
{
int idx = index -1;
if (-1 < idx < [records count]) {
cursor = idx;
return YES;
}
return NO;
}
-(OCField*)indexOffield:(NSInteger) index
{
OCField* ret = nil;
int ct = 0;
NSMutableDictionary* dic = [records objectAtIndex:cursor];
for (NSString* key in dic)
{
ret = [dic objectForKey:key];
if (index == ct)
break;
else
ct++;
}
return ret;
}
@end
@implementation OCSqlite
@synthesize dataset;
-(id)init
{
self = [super init];
if (self) {
dataset = [[OCDataset alloc]init];
return self;
}
return nil;
}
-(void)dealloc
{
[dataset release];
sqlite3_close(db);
[super dealloc];
}
-(BOOL)ConnectToDB:(NSString*) dbfilepath
{
BOOL successful;
successful = sqlite3_open([dbfilepath UTF8String], &db)==SQLITE_OK;
if (!successful) {
sqlite3_close(db);
return NO;
}
return YES;
}
-(void)DisconnectDB
{
sqlite3_close(db);
}
-(BOOL)excesql:(NSString*) ddlsql
{
char* err;
if (sqlite3_exec(db, [ddlsql UTF8String], NULL, NULL, &err)!=SQLITE_OK)
{
return NO;
}
return YES;
}
-(BOOL)query:(NSString*) qysql
{
sqlite3_stmt* cmd;
if (sqlite3_prepare_v2(db, [qysql UTF8String], -1, &cmd, nil)!=SQLITE_OK)
{
return NO;
}
[dataset clear];
while(sqlite3_step(cmd)==SQLITE_ROW)
{
[dataset fillData:cmd];
}
[dataset reset];
sqlite3_finalize(cmd);
return YES;
}
-(BOOL)startTranslation
{
char* err;
if (sqlite3_exec(db, "begin transaction",NULL, NULL, &err)!=SQLITE_OK)
{
return NO;
}
return YES;
}
-(BOOL)commitTranslation
{
char* err;
if (sqlite3_exec(db, "commit transaction",NULL, NULL, &err)!=SQLITE_OK)
{
return NO;
}
return YES;
}
-(BOOL)rollbackTranslation
{
char* err;
if (sqlite3_exec(db, "rollback transaction",NULL, NULL, &err)!=SQLITE_OK)
{
return NO;
}
return YES;
}
@end

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