SQLite3 使用详解

iPhone中支持通过sqlite3来访问iPhone本地的数据库。

具体使用方法如下

1:添加开发包libsqlite3.0.dylib

首先是设置项目文件，在项目中添加iPhone版的sqlite3的数据库的开发包，在项目下的Frameworks点击右键，然后选择libsqlite3.0.dylib文件。

libsqlite3.0.dylib文件地址: 
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS2.2.sdk/usr/lib/libsqlite3.0.dylib

2，代码中的操作：

那么接下来是代码了。

1 首先获取iPhone上sqlite3的数据库文件的地址

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingPathComponent:@"database_name"];

2 打开iPhone上的sqlite3的数据库文件

sqlite3 *database;
sqlite3_open([path UTF8String], &database);

3 准备sql文－－－sql语句

sqlite3_stmt *stmt;
const char *sql = " SELECT * FROM table_name WHERE pk=? and name=?";
sqlite3_prepare_v2(database,  sql, -1, &stmt, NULL);

4 邦定参数

// 邦定第一个int参数
sqlite3_bind_int(stmt, 1, 1);
// 邦定第二个字符串参数
sqlite3_bind_text(stmt, 2, [title UTF8String], -1, SQLITE_TRANSIENT);

5 执行sql文

sqlite3_step(stmt);

6 释放sql文资源

sqlite3_finalize(stmt);

7 关闭iPhone上的sqlite3的数据库

sqlite3_close(database);

- (BOOL)openSqlite {     NSArray *paths1 = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);     NSString *thePath1 = [paths1 objectAtIndex:0];     NSLog(@"%@",thePath1);          NSArray *paths2 = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES);     NSString *cachesDirectory2 = [paths2 objectAtIndex:0];     NSLog(@"%@",cachesDirectory2);          NSString *paths = [[NSBundle mainBundle] resourcePath];     NSLog(@"%@",paths);     NSString *xmlFile = [paths stringByAppendingPathComponent:@"Provin.db"];     if (sqlite3_open([xmlFile UTF8String], &database) != SQLITE_OK) {         sqlite3_close(database);         database = NULL;         return NO;     }     return YES; } - (void)closeSqlite {     if (database!=nil) {         sqlite3_close(database);         database = NULL;     } } -(void)searchPrivince {     [arrProvince removeAllObjects];     NSString* selectSQL1 = [[NSString alloc] initWithFormat:@"select province,provinceID from province"];          sqlite3_stmt* statement;     if (sqlite3_prepare_v2(database, [selectSQL1 UTF8String], -1, &statement, nil) == SQLITE_OK) {         while (sqlite3_step(statement)== SQLITE_ROW) {             char* province = (char*)sqlite3_column_text(statement, 0);             char* provinceid = (char*)sqlite3_column_text(statement, 1);             NSString* provinceName = [[NSString alloc] initWithCString:province encoding:NSUTF8StringEncoding];             NSString* provinceID = [[NSString alloc] initWithCString:provinceid encoding:NSUTF8StringEncoding];             provinceData = [[PhysicalBuyProvinceData alloc]init];             provinceData.strProvinceName = provinceName;             provinceData.strProvinceID = provinceID;             [arrProvince addObject:provinceData];             [provinceID release];             [provinceName release];             [provinceData release];         }     }     [selectSQL1 release];     sqlite3_finalize(statement); }