1。創建數據庫並且打開
- (void)open_db
{
@synchronized(self){
NSArray *pathArray =NSSearchPathForDirectoriesInDomains(NSCachesDirectory,NSUserDomainMask, YES);
NSString *path = [[pathArrayobjectAtIndex:0]stringByAppendingPathComponent:@"Amt.db"];
if (sqlite3_open([pathUTF8String], &database) != SQLITE_OK) {
sqlite3_close(database);
NSLog(@"創建數據庫失敗");
}
}
}
2。關閉數據庫
sqlite3_close(database);
3。創建表
- (void)create_table:(NSString*)tableName
{
tableDBName = tableName;
[[NSUserDefaults standardUserDefaults] setObject:tableNameforKey:TABLENAME];
char *errMsg;
NSString *createTableSql = [NSStringstringWithFormat:
@"create table if not exists 'Amt_%@'(\
row integer primay key ,\
msgid,\
msgtitle,\
msgcontent,\
channelid,\
channelname,\
channeltype)",tableDBName];
if (sqlite3_exec(database, [createTableSqlUTF8String], NULL, NULL, &errMsg)!= SQLITE_OK) {
NSLog(@"創建表失敗");
sqlite3_free(errMsg);
[self close];
}
}
4。添加表數據- (void)addMesg:(MsgInfo*)msgInfo
{
char *errMsg;
tableDBName = [[NSUserDefaultsstandardUserDefaults] objectForKey:TABLENAME];
NSString *addSql = [NSStringstringWithFormat:@"insert or replace into 'Amt_%@'(msgid,msgtitle,msgcontent,channelid,channelname,channeltype) values('%@','%@','%@','%@','%@','%@'); ",tableDBName,msgInfo.msgid,msgInfo.msgtitle,msgInfo.msgcontent,msgInfo.channelid,msgInfo.channelname,msgInfo.channeltype];
if (sqlite3_exec(database, [addSqlUTF8String], NULL, NULL, &errMsg)!= SQLITE_OK) {
NSLog(@"插入數據失敗");
sqlite3_free(errMsg);
[self close];
}
}
5。篩選數據- (NSMutableArray *)getChannelIDInfo :(NSString *)channleIDInfo
{
NSMutableArray *msgArray = [[NSMutableArrayalloc] init];
MsgInfo *msgInfo = [[MsgInfoalloc] init];
tableDBName = [[NSUserDefaultsstandardUserDefaults] objectForKey:TABLENAME];
sqlite3_stmt *statement;
NSString *selSql = [NSStringstringWithFormat:@"select * from 'Amt_%@' where channelid = '%@'",tableDBName,channleIDInfo];
if (sqlite3_prepare_v2(database, [selSqlUTF8String], -1, &statement, nil) == SQLITE_OK) {
while (sqlite3_step(statement) ==SQLITE_ROW) {
//通過循環檢索所有結果
char * msgid = (char*)sqlite3_column_text(statement,1);
char * msgtitle = (char*)sqlite3_column_text(statement,2);
char * msgcontent = (char *)sqlite3_column_text(statement,3);
char * channelid = (char *)sqlite3_column_text(statement,4);
char * channelname = (char *)sqlite3_column_text(statement,5);
char * channeltype = (char *)sqlite3_column_text(statement,6);
NSString *msgidStr = [NSStringstringWithCString:msgid encoding:NSUTF8StringEncoding];
NSString *msgtitleStr = [NSStringstringWithCString:msgtitle encoding:NSUTF8StringEncoding];
NSString *msgcontentStr = [NSStringstringWithCString:msgcontent encoding:NSUTF8StringEncoding];
NSString *channelidStr = [NSStringstringWithCString:channelid encoding:NSUTF8StringEncoding];
NSString *channelnameStr = [NSStringstringWithCString:channelname encoding:NSUTF8StringEncoding];
NSString *channeltypeStr = [NSStringstringWithCString:channeltype encoding:NSUTF8StringEncoding];
msgInfo.msgid = msgidStr;
msgInfo.msgtitle = msgtitleStr;
msgInfo.msgcontent = msgcontentStr;
msgInfo.channelid = channelidStr;
msgInfo.channelname = channelnameStr;
msgInfo.channeltype = channeltypeStr;
[msgArray addObject:msgInfo];
}
}
sqlite3_finalize(statement);
return [msgArray autorelease];
}
6. 刪除數據
- (void)delOneMsg:(NSString *)channleIDInfo
{
char *errMsg;
tableDBName = [[NSUserDefaults standardUserDefaults] objectForKey:TABLENAME];
NSString *delSql = [NSString stringWithFormat:@"delete from 'Amt_%@' where channelid = '%@'",tableDBName,channleIDInfo];
if (sqlite3_exec(database, [delSql UTF8String],NULL , NULL, &errMsg)!= SQLITE_OK) {
NSLog(@"刪除失敗");
sqlite3_free(errMsg);
}
}