iOS下 Sqlite3 簡單的代碼例子

iOS下 Sqlite3  簡單的代碼例子

首先，導入libsqlite3.0.dylib庫

 我們，來看一下.h文件

#import <sqlite3.h>
@interface ViewController : UIViewController
@property (assign,nonatomic)sqlite3* database;
-(IBAction)openDB;
-(IBAction)createTestList;
-(IBAction)insertTable;
-(IBAction)queryTable;
-(IBAction)deleteTable;
-(IBAction)updateTable;
@end

//獲取document沙箱路徑
-(NSString*)dataFilePath{
           
    NSArray *myPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *myDocPath = [myPaths objectAtIndex:0];
    NSString *filename = [myDocPath  stringByAppendingPathComponent:@"sqlite.db"];
    NSLog(@"%@",filename);
    return filename;//這裏很神奇，可以定義成任何類型的文件，也可以不定義成.db文件，任何格局都行，定義成.sb文件都行，達到了很好的數據隱祕性
}

//創建，打開數據庫
-(IBAction)openDB
{
    //獲取數據庫路徑
    NSString* path = [self dataFilePath];
    //若是數據庫存在，則用sqlite3_open直接打開（若是數據庫不存在sqlite3_open會主動創建）
    sqlite3_open([path UTF8String], &_database);
}

//創建表
-(IBAction)createTestList
{
                                               
      const char *createSql="create table if not exists testTable(ID INTEGER PRIMARY KEY AUTOINCREMENT, testID int,testValue text,testName text)";
    sqlite3_exec(_database, createSql, NULL, NULL, NULL);
}

//插入數據
-(IBAction)insertTable
{
    const char *insertSql="INSERT INTO testTable(testID, testValue,testName) VALUES(120,'ew','45')";
    sqlite3_exec(_database, insertSql, NULL, NULL, nil);
                                         
}

//查看數據
-(IBAction)queryTable
{
    [self openDB];
    const char *selectSql="select testID,testName from testTable";
    sqlite3_stmt *statement;
    if (sqlite3_prepare_v2(_database, selectSql, -1, &statement, nil)==SQLITE_OK)
    {
        NSLog(@"select ok.");
        while (sqlite3_step(statement)==SQLITE_ROW)//SQLITE_OK SQLITE_ROW
        {
            int _id=sqlite3_column_int(statement, 0);
            NSString *name=[[NSString alloc] initWithCString:(char *)sqlite3_column_text(statement, 1) encoding:NSUTF8StringEncoding];
            NSLog(@"row>>id %i, name>> %@",_id,name);
        }
                                         
    }
                                     
}

//刪除數據
-(IBAction)deleteTable
{
    [self openDB];
                                 
    const char *sql = "DELETE FROM testTable where testName='45'";
    sqlite3_exec(_database, sql, NULL, NULL, nil);
                              
}

//更改數據
-(IBAction)updateTable
{
                             
    [self openDB];
                             
    const char *sql = "update testTable set testName ='444' WHERE testID =120";
                           
    sqlite3_exec(_database, sql, NULL,NULL,NULL);
     sqlite3_close(_database);
                             
}

最後，在XIB中拖四個按鈕與增、刪、改、查 四個方法相關聯

Hi，推薦文件給你 "Sqlite例子.zip" http://vdisk.weibo.com/s/HqLZq

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