ios-数据库-sqlite-数据库得封装(自己写得，有很多不严谨)最后还有一个单例得实现

libsqlite3.0.dylib//使用的时候要先导入这个库

staic  UserDB* instance//UserDB是一个管理数据库的类
＋(void) shareInstance{
    if(instance==nil)
    {
     instance=[[[self class]alloc]init];
    }
   return instance;
}

//
//  UserDB.m
//  sqllitedemo
//
//  Created by  liyang on 14-4-26.
//  Copyright (c) 2014年 liyang. All rights reserved.
//

#import "UserDB.h"

@implementation UserDB
-(void)createTable:(NSString *)sql{
    sqlite3 *sqllite=nil;
    
    NSString *sqllitepath=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/data.sqlite"];
   int result=sqlite3_open([sqllitepath UTF8String], &sqllite);
    if (result!=SQLITE_OK) {
        NSLog(@"打开数据库失败");
        return;
    }
    
    char *error=NULL;
   int createtableresult= sqlite3_exec(sqllite, [sql UTF8String], NULL, NULL, &error);
    if (createtableresult!=SQLITE_OK) {
        NSLog(@"创建表失败");
        sqlite3_close(sqllite);
        return;
    }
       sqlite3_close(sqllite);
    
}
-(void)insertData:(NSString *)sql{
    sqlite3 *sqllite=nil;
    sqlite3_stmt *stmt=nil;
    NSString *sqllitepath=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/data.sqlite"];
    int result=sqlite3_open([sqllitepath UTF8String], &sqllite);
    if (result!=SQLITE_OK) {
        NSLog(@"打开数据库失败");
        return;
    }
    
    int stmtresult=sqlite3_prepare_v2(sqllite, [sql UTF8String], -1, &stmt, NULL);
    if (stmtresult!=SQLITE_OK) {
        NSLog(@"编译失败");
        sqlite3_close(sqllite);
        return;
    }
    NSString *username=@"liyang11";
    NSString *password=@"123456";
    NSString *email=@"liyang20098@163.com";
    
    sqlite3_bind_text(stmt, 1, [username UTF8String], -1, NULL);
    sqlite3_bind_text(stmt, 2, [password UTF8String], -1, NULL);
    sqlite3_bind_text(stmt, 3, [email UTF8String], -1, NULL);
    
    int stepresult=sqlite3_step(stmt);
    NSLog(@"%d",stepresult);
    if (stepresult==SQLITE_ERROR||stepresult==SQLITE_MISUSE||SQLITE_CONSTRAINT==stepresult) {
        NSLog(@"执行失败");
        sqlite3_finalize(stmt);
        sqlite3_close(sqllite);
        return;
    }
    sqlite3_finalize(stmt);
    sqlite3_close(sqllite);
    NSLog(@"插入语句成功");
    
}
-(void)selectData:(NSString *)sql{
    sqlite3 *sqllite=nil;
    sqlite3_stmt *stmt=nil;
    NSString *sqllitepath=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/data.sqlite"];
    int result=sqlite3_open([sqllitepath UTF8String], &sqllite);
    if (result!=SQLITE_OK) {
        NSLog(@"打开数据库失败");
        return;
    }
    
    int stmtresult=sqlite3_prepare_v2(sqllite, [sql UTF8String], -1, &stmt, NULL);
    if (stmtresult!=SQLITE_OK) {
        NSLog(@"编译失败");
        sqlite3_close(sqllite);
        return;
    }
     NSString *password=@"123456";
     sqlite3_bind_text(stmt, 1, [password UTF8String], -1, NULL);
    
    int stepresult=sqlite3_step(stmt);
    if (stepresult==SQLITE_ERROR||stepresult==SQLITE_MISUSE||SQLITE_CONSTRAINT==stepresult) {

        NSLog(@"执行失败");
        sqlite3_finalize(stmt);
        sqlite3_close(sqllite);
        return;
    }
    
    while (stepresult==SQLITE_ROW) {
        char * username=(char *)sqlite3_column_text(stmt, 0);//注意这是从0开始，上面绑定参数的是从1开始
        char * password=(char *)sqlite3_column_text(stmt, 1);
        char * email=(char *)sqlite3_column_text(stmt, 2);
        NSString *username_new= [NSString stringWithCString:username encoding:NSUTF8StringEncoding];
        NSString *password_new= [NSString stringWithCString:password encoding:NSUTF8StringEncoding];
        NSString *email_new= [NSString stringWithCString:email encoding:NSUTF8StringEncoding];
        NSLog(@"username:%@------password:%@------email:%@",username_new,password_new,email_new);
        stepresult=sqlite3_step(stmt);
    }
    
    sqlite3_finalize(stmt);
    sqlite3_close(sqllite);
    NSLog(@"查询句成功");

}
@end

 //下面是一个工具类

//
//  DataBaseModel.h
//  Track-tripStrategy
//
//  Created by ncg ncg-2 on 11-11-5.
//  Copyright 2011 www.iphonetrain.com 无限互联3G学院. All rights reserved.
//

#import <Foundation/Foundation.h>
#import <sqlite3.h>


@interface BaseDB : NSObject 
{
    sqlite3 *database;
}

//创建表
-(void)createTable:(NSString *)sql;

/**
 * 接口描述：查询数据
 * 参数: sql:sql语句
 *      columns： 查询的字段数量
 * 返回值：[["字段值1","字段值2"],.....];
 */
- (NSMutableArray *)selectData:(NSString *)sql columns:(int)col;


/**
 * 接口描述：增，删，改数据库
 * 参数： sql：SQL语句
         paramarray： 参数
 * 返回值：是否执行成功
 * 
 */
- (BOOL)dealData:(NSString *)sql paramarray:(NSArray *)param;

/**
 *  接口描述：保存带"图片/文件"的字段
 */
- (BOOL)saveimage:(NSString *)sql paramarray:(NSMutableArray *)param;

/**
 * 接口描述：查询图片数据
 */
- (UIImage *)selectData:(NSString *)sql;

/**
 * 接口描述：查询某张表中数据的数量
 */
- (NSUInteger) selectCount:(NSString *)sql;

- (NSMutableArray *)selectFullData:(NSString *)sql columns:(int)col ;


+ (void)createAllTabel;

@end

//
//  DataBaseModel.m
//  Track-tripStrategy
//
//  Created by ncg ncg-2 on 11-11-5.
//  Copyright 2011 www.iphonetrain.com 无限互联3G学院 All rights reserved.
//

#import "BaseDB.h"
#import "UserDB.h"


@implementation BaseDB

#define kFilename    @"data.sqlite"

- (NSString *)dataFilePath 
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(
                                                         NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    return [documentsDirectory stringByAppendingPathComponent:kFilename];
}


//创建表
-(void)createTable:(NSString *)sql
{
    //打开数据库
    if (sqlite3_open([[self dataFilePath] UTF8String], &database)!= SQLITE_OK) {
        sqlite3_close(database);
        NSAssert(0, @"Failed to open database");
    }
 

    char *errorMsg;
    //创建一个表
    if (sqlite3_exec (database, [sql  UTF8String],NULL, NULL, &errorMsg) != SQLITE_OK)         
    {
        sqlite3_close(database);
        NSAssert1(0, @"Error creating table: %s", errorMsg);
    }
}


#pragma mark 查询数据库
/************
 sql：sql语句
 col：sql语句需要操作的表的所有字段数
 ***********/
- (NSMutableArray *)selectData:(NSString *)sql columns:(int)col 
{
    //打开数据库
    if (sqlite3_open([[self dataFilePath] UTF8String], &database)!= SQLITE_OK) {
        sqlite3_close(database);
        NSAssert(0, @"Failed to open database");
    }
    
     NSMutableArray *returndata = [[[NSMutableArray alloc] init] autorelease];//所有记录
        sqlite3_stmt *statement = nil;
        if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL) == SQLITE_OK) {
            while (sqlite3_step(statement) == SQLITE_ROW) {
                NSMutableArray *row;//一条记录
                row = [[NSMutableArray alloc] init];
                for(int i=0; i<col; i++)
                {
                    char* contentchar = (char*)sqlite3_column_text(statement, i);
                    if (contentchar) 
                    {
                        [row addObject:[NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:contentchar]]];
                    }
                }
                [returndata addObject:row];
                [row release];
            }
        }else 
        {
            NSLog(@"Error: failed to prepare");
            return NO;
        }
        sqlite3_finalize(statement);
         return returndata; 
}

#pragma mark 查询数据库
/************
 sql：sql语句
 col：sql语句需要操作的表的所有字段数
 ***********/
- (NSMutableArray *)selectFullData:(NSString *)sql columns:(int)col 
{
    //打开数据库
    if (sqlite3_open([[self dataFilePath] UTF8String], &database)!= SQLITE_OK) {
        sqlite3_close(database);
        NSAssert(0, @"Failed to open database");
    }
    
     NSMutableArray *returndata = [[[NSMutableArray alloc] init] autorelease];//所有记录
    sqlite3_stmt *statement = nil;
    if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL) == SQLITE_OK) {
        while (sqlite3_step(statement) == SQLITE_ROW) {
            NSMutableArray *row;//一条记录
            row = [[NSMutableArray alloc] init];
            for(int i=0; i<col; i++)
            {
                char* contentchar = (char*)sqlite3_column_text(statement, i);
                if (contentchar) 
                {
                    [row addObject:[NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:contentchar]]];
                }
                else
                {
                    [row addObject:@""];
                }
            }
            [returndata addObject:row];
            [row release];
        }
    }else 
    {
        NSLog(@"Error: failed to prepare");
        return NO;
    }
    sqlite3_finalize(statement);
    NSLog(@"%@",returndata);
    return returndata; 
}

/************
 sql：sql语句
 ***********/
- (UIImage *)selectData:(NSString *)sql
{
    UIImage *returnimg = [[UIImage alloc] init];
    if (sqlite3_open([[self dataFilePath] UTF8String], &database) == SQLITE_OK) {
        sqlite3_stmt *statement = nil;
        if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL) == SQLITE_OK) {
            while (sqlite3_step(statement) == SQLITE_ROW) {
                int bytes = sqlite3_column_bytes(statement, 0);
                const void *value = sqlite3_column_blob(statement, 0);
                if( value != NULL && bytes != 0 ){
                    NSData *data = [NSData dataWithBytes:value length:bytes];
                    returnimg=[UIImage imageWithData:data];
                }
                else{
                    NSLog(@"img is null");
                }
            }
        }else {
            NSLog(@"Error: failed to prepare");
            return NO;
        }
        return returnimg;
        sqlite3_finalize(statement);
    } else {
        sqlite3_close(database);
        NSAssert1(0, @"Failed to open database with message '%s'.", sqlite3_errmsg(database));
    }//end if
    sqlite3_close(database);
    return [returnimg autorelease];
}



#pragma mark 增，删，改数据库
/************
 sql：sql语句
 param：sql语句中?对应的值组成的数组
 ***********/
- (BOOL)dealData:(NSString *)sql paramarray:(NSArray *)param 
{
//    sql = @"INSERT OR REPLACE INTO FIELDS (ROW, FIELD_DATA) VALUES (?, ?);";

//    sql = @"INSERT  INTO TravelPointTable ( trackId , latitude , longitude) VALUES ( ?,?,?);";
//    param = [NSArray arrayWithObjects:@"11111",@"22222",@"3333",nil];
    if (sqlite3_open([[self dataFilePath] UTF8String], &database) == SQLITE_OK)
    {
        sqlite3_stmt *statement = nil;
        int success = sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL);
        if (success != SQLITE_OK) {
            NSLog(@"Error: failed to prepare");
            return NO;
        }
        //绑定参数
        for (int i=0; i<[param count]; i++) 
        {
            NSString *temp = [param objectAtIndex:i];
            sqlite3_bind_text(statement, i+1, [temp UTF8String], -1, SQLITE_TRANSIENT);
        }
        success = sqlite3_step(statement);
        sqlite3_finalize(statement);
        if (success == SQLITE_ERROR) 
        {
            NSLog(@"Error: failed to insert into the database");
            return NO;
        }
    }

    
    sqlite3_close(database);   
    NSLog(@"处理成功！");
    return TRUE;
}

#pragma  查询某个东西的合计
- (NSUInteger) selectCount:(NSString *)sql
{
    NSUInteger total = 0;
//    const char *sql = "SELECT COUNT(*) AS amount FROM xxx";

    if (sqlite3_open([[self dataFilePath] UTF8String], &database) == SQLITE_OK)
    {
        sqlite3_stmt *statement = nil;

        if (sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL) != SQLITE_OK)
        {
            NSAssert1(0, @"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database));
        }
        
        if (sqlite3_step(statement) == SQLITE_ROW)
        {
            total = sqlite3_column_int(statement, 0);
        }
        
        sqlite3_finalize(statement);
    }
    return total;
}

#pragma mark 向数据库保存图片
/************
 sql：sql语句
 param：
 ***********/
- (BOOL)saveimage:(NSString *)sql paramarray:(NSMutableArray *)param {
    if (sqlite3_open([[self dataFilePath] UTF8String], &database) == SQLITE_OK) {
        sqlite3_stmt *statement = nil;
        int success =sqlite3_prepare(database,[sql UTF8String],-1,&statement,0);
        // int success = sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, NULL);
        if (success != SQLITE_OK) {
            NSLog(@"Error: failed to prepare");
            return NO;
        }
        //绑定参数
        for (int i=0; i<[param count]; i++) {
            if (i==2) {
                NSData *imgdata = [param objectAtIndex:2];
                sqlite3_bind_blob(statement, 3, [imgdata bytes], [imgdata length], NULL);//如果是nsdata型
            }
            else {
                NSString *temp = [param objectAtIndex:i];
                sqlite3_bind_text(statement, i+1, [temp UTF8String], -1, SQLITE_TRANSIENT);
            }
        }
        success = sqlite3_step(statement);
        sqlite3_finalize(statement);
        if (success == SQLITE_ERROR) {
            NSLog(@"Error: failed to insert into the database");
            return NO;
        }
    }
    NSLog(@"处理成功！");
    
    return TRUE;
}


+ (void)createAllTabel {
    [[UserDB sharedUserDB] createTable];
}


@end