IPhone MySQL数据库操作代码例子

核心提示：//database operation打开数据库-(BOOL) opendatabase{NSArray*paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);NSString *documents

//database operation

打开数据库

-(BOOL) opendatabase{

NSArray*paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES);

NSString *documentsDirectory = [pathsobjectAtIndex:0];

NSString *path = [documentsDirectorystringByAppendingPathComponent:@"mydb.sql"];

NSFileManager*fileManager = [NSFileManagerdefaultManager];

BOOL find = [fileManagerfileExistsAtPath:path];

//找到数据库文件mydb.sql

if (find) {

NSLog(@"Database file have already existed.");

if(sqlite3_open([pathUTF8String], &database_) !=SQLITE_OK) {

sqlite3_close(database_);

NSLog(@"Error: open database file.");

return NO;

}

return YES;

}

if(sqlite3_open([path UTF8String], &database_) ==SQLITE_OK) {

//bFirstCreate_ = YES;

[selfcreateChannelsTable:database_];//在后面实现函数createChannelsTable

return YES;

}else {

sqlite3_close(database_);

NSLog(@"Error: open database file.");

return NO;

}

return NO;

}

创建表

- (BOOL) createChannelsTable:(sqlite3*)db{

char*sql = "CREATE TABLE reports (id integer primary key,stime text,stitle text,scal text,sruntime text)";

sqlite3_stmt *statement;

if(sqlite3_prepare_v2(db, sql, -1, &statement,nil) !=SQLITE_OK) {

NSLog(@"Error: failed to prepare statement:create reports table");

return NO;

}

int success =sqlite3_step(statement);

sqlite3_finalize(statement);

if ( success !=SQLITE_DONE) {

NSLog(@"Error: failed to dehydrate:CREATE TABLE reports");

return NO;

}

NSLog(@"Create table 'reports' successed.");

return YES;