-(BOOL)createDB{
NSString *docsDir;
NSArray *dirPaths;
dirPaths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
databasePath = [[NSString alloc] initWithString:
[docsDir stringByAppendingPathComponent: @"oiwii.db"]];
BOOL isSuccess = YES;
NSFileManager *filemgr = [NSFileManager defaultManager];
if ([filemgr fileExistsAtPath: databasePath ] == NO)
{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
char *errMsg;
const char *sql_stmt ="create table if not exists jsonData (status text, message text, mood_name text, description text, c1 text, c2 text c3 text, c4 text, c5 text, font_name text, font_size text, font_color text)";
if (sqlite3_exec(database, sql_stmt, NULL, NULL, &errMsg)!= SQLITE_OK)
{
isSuccess = NO;
NSLog(@"Failed to create table");
}
sqlite3_close(database);
return isSuccess;
}
else {
isSuccess = NO;
NSLog(@"Failed to open/create database");
}
}
return isSuccess;
}
我在上面创建了一个数据库，我正在尝试将json对象（数组）添加到我的sqlite中。 我的json对象看起来像这样 - {＆＃34; moods_name＆＃34;：＆＃34; mood2＆＃34;，＆＃34;说明＆＃34;：＆＃34;这是情绪2＆＃34;，＆＃34; c1＆＃34;：＆ ＃34; D4FF38＆＃34;＆＃34; C2＆＃34;：＆＃34; FFA83D＆＃34;＆＃34; C3＆＃34;：＆＃34; FFFA9E＆＃34;＆＃34; C4＆＃ 34;：＆＃34; 66FFBA＆＃34;＆＃34; C5＆＃34;：＆＃34; 63FFE8＆＃34;＆＃34; font_name首＆＃34;：＆＃34;默认＆＃34;＆＃ 34; FONT_SIZE＆＃34;：＆＃34; 10＆＃34;＆＃34; font_color＆＃34;：＆＃34; 363636＆＃34;} 我想要获取此数组
-(BOOL)saveData:(NSString *)status message:(NSString *)message mood_name:(NSString *)mood_name description:(NSString *)description c1:(NSString *)c1 c2:(NSString *)c2 c3:(NSString *)c3 c4:(NSString *)c4 c5:(NSString *)c5 font_name:(NSString *)font_name font_size:(NSString *)font_size font_color:(NSString *)font_color{
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *insertSQL = [NSString stringWithFormat:@"insert into jsonData (status,message, description, c1,c2,c3,c4,c5,font_name,font_size,font_color) values (\"%@\",\"%@\", \"%@\", \"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\",\"%@\")",status, message, description, c1,c2,c3,c4,c5,font_name,font_size,font_color];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(database, insert_stmt,-1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{ NSLog(@"data saved");
return YES;
}
else {
return NO;
}
}
sqlite3_reset(statement);
return NO;
}
更新： 用于获取数据的代码
-(void)fetchdata
{
arrayfetched = [[NSMutableArray alloc] init];
// Setup the database object
sqlite3 *database;
// Open the database from the users filessytem
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
//SQLIte Statement
NSString *sqlStatement_userInfo =[NSString stringWithFormat:@"Select * from moodsdata"];
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, [sqlStatement_userInfo UTF8String], -1, &compiledStatement, NULL) == SQLITE_OK)
{
// Loop through the results and add them to the fetchedarray
while(sqlite3_step(compiledStatement) == SQLITE_ROW)
{
// Init the Data Dictionary
NSMutableDictionary *_dataDictionary=[[NSMutableDictionary alloc] init];
NSString *msg = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];
NSString *status = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
NSString *data = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
[_dataDictionary setObject:[NSString stringWithFormat:@"%@",msg] forKey:@"message"];
[_dataDictionary setObject:[NSString stringWithFormat:@"%@",status] forKey:@"status"];
[_dataDictionary setObject:[NSString stringWithFormat:@"%@",data] forKey:@"data"];
[arrayfetched addObject:_dataDictionary];
NSLog(@"array fetched%@",arrayfetched);
}
}
else
{
NSLog(@"No Data Found");
}
// Release the compiled statement from memory
sqlite3_finalize(compiledStatement);
}
sqlite3_close(database);
NSLog(@" fetched array%@",arrayfetched);
}
请帮帮我。
答案 0 :(得分：0)
您可以创建一个类完成所有与数据库相关的工作。在项目中的任何位置调用该特定方法，以从数据库中插入，更新或删除任何内容。
您可以参考此链接以获取更多信息和教程：this
答案 1 :(得分：0)
尝试使用此方法保存到数据库中。准备语句比普通插入查询更好。
-(BOOL) saveApiResults: (NSString *)tableName : (NSArray *)data {
//assign false value to saveSuccess
BOOL saveSuccess = NO;
sqlite3 *database;
@try {
//get database path
const char *dbPath = [YOUR_DB_PATH UTF8String];
if(sqlite3_open(dbPath,&database)==SQLITE_OK) {
sqlite3_exec(database, "BEGIN", 0, 0, 0);
NSDictionary *rowData=[data objectAtIndex:0];
//convert the string into array
NSArray *keyArray = [rowData allKeys];
NSString *insertSQL=@"INSERT OR REPLACE INTO ";
insertSQL=[insertSQL stringByAppendingString:tableName];
insertSQL=[insertSQL stringByAppendingString:@" VALUES("];
for(int j=0;j<[keyArray count];j++)
{
insertSQL=[insertSQL stringByAppendingString:@"?"];
if(j<[keyArray count]-1)
insertSQL=[insertSQL stringByAppendingString:@","];
}
insertSQL=[insertSQL stringByAppendingString:@");"];
NSLog(@"query : %@ ",insertSQL);
const char *sqlstatement = [insertSQL UTF8String];
sqlite3_stmt *compiledstatement;
if(sqlite3_prepare_v2(database,sqlstatement , -1, &compiledstatement, NULL)==SQLITE_OK) {
//fetch the dictionary(key,value) from the array of api result
for (NSUInteger i = 0; i < [data count]; i++) {
NSDictionary *rowData=[data objectAtIndex:i];
//get the value for ech key from api response and execute the insert statement
for(int j=0;j<[keyArray count];j++) {
NSString *val = @"";
NSString *value=(NSString *)[rowData objectForKey:[keyArray objectAtIndex:j]];
if((value != nil) && (![value isEqual:[NSNull null]]))
val=[NSString stringWithFormat:@"%@",value];
sqlite3_bind_text(compiledstatement,j+1,[val UTF8String], -1, SQLITE_TRANSIENT);
}
if(sqlite3_step(compiledstatement) != SQLITE_DONE) {
NSLog(@"ERROR");
}
sqlite3_clear_bindings(compiledstatement);
sqlite3_reset(compiledstatement);
}
sqlite3_exec(database, "COMMIT", 0, 0, 0);
saveSuccess = YES;
NSLog(@"RESULTS SAVED SUCCESSFULLY!");
} else {
NSLog(@"Statement FAILED (%s)", sqlite3_errmsg(database));
}
sqlite3_finalize(compiledstatement);
} else {
NSLog(@"Statement FAILED (%s)", sqlite3_errmsg(database));
}
}
@catch (NSException *exception) {
NSLog(@"NSException : %@",exception.description);
}
@finally {
sqlite3_close(database);
}
//return data save status
return saveSuccess;
}
这里解析你的JSON Response并发送NSDictionary对象的NSArray到saveApiResults方法。
-(void) saveJSONData {
NSData* jsonData = [YOUR_JSON_RESPONSE dataUsingEncoding:NSUTF8StringEncoding];
NSError *error = nil;
NSDictionary *responseObj = [NSJSONSerialization
JSONObjectWithData:jsonData
options:0
error:&error];
if(! error) {
NSArray *responseArray = [responseObj objectForKey:@"data"];
[self saveApiResults : YOUR_TABLE_NAME : responseArray];
} else {
NSLog(@"Error in parsing JSON");
}
}
//获取结果的代码
-(NSMutableArray *)getQueryResult {
//get the database path
const char *dbpath = [databasePath UTF8String];
sqlite3 *DB;
NSMutableArray *results=[[NSMutableArray alloc] init];
@try {
sqlite3_stmt *statement;
NSMutableDictionary *dict;
if (sqlite3_open(dbpath, &DB) == SQLITE_OK) {
//sql select query
NSString *querySQL = [NSString stringWithFormat: @"SELECT * from moodsdata"];
const char *query_stmt = [querySQL UTF8String];
if (sqlite3_prepare_v2(DB, query_stmt, -1, &statement, NULL) == SQLITE_OK){
if(sqlite3_step(statement) == SQLITE_ROW) {
do {
dict = [[NSMutableDictionary alloc] init];
const unsigned char *msg = sqlite3_column_text(statement, 0);
const unsigned char *status = sqlite3_column_text(statement, 1);
const unsigned char *data = sqlite3_column_text(statement, 2);
[dict setValue:[NSString stringWithFormat:@"%s",msg] forKey:@"message"];
[dict setValue:[NSString stringWithFormat:@"%s",status] forKey:@"status"];
[dict setValue:[NSString stringWithFormat:@"%s",data] forKey:@"data"];
//add dictionary(key,value) to the array
[results addObject:dict];
}
while (sqlite3_step(statement) == SQLITE_ROW);
} else {
NSLog(@"Statement FAILED (%s)",sqlite3_errmsg(DB));
}
} else {
NSLog(@"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(DB));
}
sqlite3_finalize(statement);
} else {
NSLog(@"Can not open DB : %s",sqlite3_errmsg(DB));
}
}
@catch (NSException *exception) {
NSLog(@"NSException : %@",exception.description);
}
@finally {
sqlite3_close(DB);
}
//return the database results
return results;
}
//如何使用getQueryResults的结果
-(void) showData {
NSMutableArray *results = [self getQueryResult];
for (NSMutableDictionary *resultDic in results) {
NSString *msg = [resultDic objectForKey:@"message"];
NSString *status = [resultDic objectForKey:@"status"];
NSString *data = [resultDic objectForKey:@"data"];
NSLog(@"Result : %@ : %@ : %@",msg,status,data);
}
}