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IPhone MySQL資料庫操作程式碼例子

//database operation

  開啟資料庫

  -(BOOL) opendatabase{

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

  NSString *documentsDirectory = [pathsobjectAtIndex:0];

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

  NSFileManager*fileManager = [NSFileManagerdefaultManager];

  BOOL find = [fileManagerfileExistsAtPath:path];

  //找到資料庫檔案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_];//在後面實現函式createChannelsTable

  return YES;

  }else {

  sqlite3_close(database_);

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

  return NO;

  }

  return NO;

  }

  建立表

  - (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;

  }

  插入表

  - (BOOL)insertOneChannel:(NSString*)stime mytitle:(NSString*)stitle mycal:(NSString*)scal myruntime:(NSString*)sruntime

  {

  sqlite3_stmt *statement;

  staticchar*sql = "INSERT INTO reports (id,stime,stitle,scal,sruntime) VALUES(NULL,?,?,?,?)";

  //問號的個數要和(cid,title,imageData,imageLen)裡面欄位的個數匹配,代表未知的值,將在下面將值和欄位關 聯。

  int success =sqlite3_prepare_v2(database_, sql, -1, &statement,NULL);

  if (success !=SQLITE_OK) {

  NSLog(@"Error: failed to insert:channels");

  return NO;

  }

  //這裡的數字1,2,3,4代表第幾個問號

  //sqlite3_bind_text(statement, 1, stime, -1, SQLITE_TRANSIENT);

  char*p = [stime cStringUsingEncoding:1];

  sqlite3_bind_text(statement,1, [stime cStringUsingEncoding:1], -1,SQLITE_TRANSIENT);

  sqlite3_bind_text(statement,2, [stitle cStringUsingEncoding:1], -1,SQLITE_TRANSIENT);

  sqlite3_bind_text(statement,3, [scal cStringUsingEncoding:1], -1,SQLITE_TRANSIENT);

  sqlite3_bind_text(statement,4, [sruntime cStringUsingEncoding:1], -1,SQLITE_TRANSIENT);

  success =sqlite3_step(statement);

  sqlite3_finalize(statement);

  if (success ==SQLITE_ERROR) {

  NSLog(@"Error: failed to insert into the database with message.");

  return NO;

  }

  NSLog(@"Insert One Channel#############:id = _");

  return YES;

  }

  查詢表

  - (void) getChannels:(NSMutableArray*)fChannels{

  sqlite3_stmt *statement =nil;

  char*sql = "SELECT * FROM reports";

  if (sqlite3_prepare_v2(database_, sql, -1, &statement,NULL) !=SQLITE_OK) {

  NSLog(@"Error: failed to prepare statement with message:get channels.");

  }

  //查詢結果集中一條一條的遍歷所有的記錄,這裡的數字對應的是列值。

  while (sqlite3_step(statement) ==SQLITE_ROW) {

  //char* cid = (char*)sqlite3_column_text(statement, 1);

  char* stime = (char*)sqlite3_column_text(statement,1);

  char* stitle =(char*)sqlite3_column_text(statement,2);

  char* scal = (char*)sqlite3_column_text(statement,3);

  char* sruntime= (char*)sqlite3_column_text(statement,4);

  //NSString *tmp = [NSString stringWithCString:stitle encoding:1];

  myreportitem* ri = [[myreportitemalloc]init];

  ri.mytime= [NSString stringWithCString:stime encoding:1];