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sqlite的创建数据库,表,插入查看数据

Jun 07, 2016 pm 03:23 PM
iossqlsqlitecreateinsertdatadatabaseCheck

IOS sqlite数据库操作。步骤是: 先加入sqlite开发库libsqlite3.dylib, 新建或打开数据库, 创建数据表, 插入数据, 查询数据并打印 1、新建项目sqliteDemo,添加使用sqlite的库libsqlite3.dylib 2、sqlite 的方法 sqlite3 *db, 数据库句柄,跟文件句柄FILE

IOS sqlite数据库操作。步骤是:

先加入sqlite开发库libsqlite3.dylib,

新建或打开数据库,

创建数据表,

插入数据,

查询数据并打印

1、新建项目sqliteDemo,添加使用sqlite的库libsqlite3.dylib

sqlite的创建数据库,表,插入查看数据

2、sqlite 的方法

sqlite3          *db, 数据库句柄,跟文件句柄FILE很类似

sqlite3_stmt      *stmt, 这个相当于ODBC的Command对象,用于保存编译好的SQL语句
sqlite3_open(),   打开数据库,没有数据库时创建。
sqlite3_exec(),   执行非查询的sql语句
Sqlite3_step(), 在调用sqlite3_prepare后,使用这个函数在记录集中移动。
Sqlite3_close(), 关闭数据库文件
还有一系列的函数,用于从记录集字段中获取数据,如
sqlite3_column_text(), 取text类型的数据。
sqlite3_column_blob(),取blob类型的数据
sqlite3_column_int(), 取int类型的数据

 

3、获取沙盒目录,并创建或打开数据库。

viewController.h头文件添加一个成员变量,并包含头文件sqlite3.h

[cpp] view plain copy

  1. #import 
  2. #import 
  3. @interface ViewController : UIViewController
  4. {
  5.     sqlite3 *db;
  6. }
  7. @end

在.m文件 定义宏,方面后面使用

[cpp] view plain copy

  1. #define DBNAME    @”personinfo.sqlite”
  2. #define NAME      @”name”
  3. #define AGE       @”age”
  4. #define ADDRESS   @”address”
  5. #define TABLENAME @”PERSONINFO”

[cpp] view plain copy

  1. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
  2.  NSString *documents = [paths objectAtIndex:0];
  3.  NSString *database_path = [documents stringByAppendingPathComponent:DBNAME];
  4.  if (sqlite3_open([database_path UTF8String], &db) != SQLITE_OK) {
  5.      sqlite3_close(db);
  6.      NSLog(@”数据库打开失败”);
  7.  }

sqlite3_open,如果数据不存在,则创建。运行。这是在沙盒目录下能看到数据库文件(如何打开模拟器沙盒目录请参考:IOS学习之IOS沙盒(sandbox)机制和文件操作(一))

sqlite的创建数据库,表,插入查看数据

 

4、创建数据表

创建一个独立的执行sql语句的方法,传入sql语句,就执行sql语句

[cpp] view plain copy

  1. -(void)execSql:(NSString *)sql
  2. {
  3.     char *err;
  4.     if (sqlite3_exec(db, [sql UTF8String], NULL, NULL, &err) != SQLITE_OK) {
  5.         sqlite3_close(db);
  6.         NSLog(@”数据库操作数据失败!”);
  7.     }
  8. }

创建数据表PERSONINFO的语句

[cpp] view plain copy

  1. NSString *sqlCreateTable = @”CREATE TABLE IF NOT EXISTS PERSONINFO (ID INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INTEGER, address TEXT)”;
  2.     [self execSql:sqlCreateTable];

运行程序,数据表创建了。怎么知道数据表创建了呢?我们用火狐的Sqlite Manager插件工具打开数据库文件看看。可以在火狐浏览器里安装这个插件。打开sqlite的创建数据库,表,插入查看数据

四个字段都出现是表中了。

5、插入数据:

[cpp] view plain copy

  1. NSString *sql1 = [NSString stringWithFormat:
  2.                      @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",
  3.                      TABLENAME, NAME, AGE, ADDRESS, @"张三", @"23", @"西城区"];
  4.     NSString *sql2 = [NSString stringWithFormat:
  5.                       @"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",
  6.                       TABLENAME, NAME, AGE, ADDRESS, @"老六", @"20", @"东城区"];
  7.     [self execSql:sql1];
  8.     [self execSql:sql2];

运行程序,插入两条数据,用火狐的sqlite工具查看sqlite的创建数据库,表,插入查看数据

6、查询数据库并打印数据

[cpp] view plain copy

  1. NSString *sqlQuery = @”SELECT * FROM PERSONINFO”;
  2.    sqlite3_stmt * statement;
  3.    if (sqlite3_prepare_v2(db, [sqlQuery UTF8String], -1, &statement, nil) == SQLITE_OK) {
  4.        while (sqlite3_step(statement) == SQLITE_ROW) {
  5.            char *name = (char*)sqlite3_column_text(statement, 1);
  6.            NSString *nsNameStr = [[NSString alloc]initWithUTF8String:name];
  7.            int age = sqlite3_column_int(statement, 2);
  8.            char *address = (char*)sqlite3_column_text(statement, 3);
  9.            NSString *nsAddressStr = [[NSString alloc]initWithUTF8String:address];
  10.            NSLog(@”name:%@  age:%d  address:%@”,nsNameStr,age, nsAddressStr);
  11.        }
  12.    }
  13.    sqlite3_close(db);

打印结果:

[cpp] view plain copy

  1. 2012-06-29 13:25:32.205 sqlitDemo[3587:f803] name:张三  age:23  address:西城区
  2. 2012-06-29 13:25:32.206 sqlitDemo[3587:f803] name:老六  age:20  address:东城区

最后关闭数据库。例子代码:http://download.csdn.net/detail/totogo2010/4400911

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