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1.数据归档接着设置要存储的数据并存储NSString *strValue=@"awdasf";
BOOL isSuccess=[NSKeyedArchiver archiveRootObject:strValue toFile:filePath];
取出数据
NSString *str=[NSKeyedUnarchiver unarchiveObjectWithFile:filePath];NSInteger value = 100;
设置文件路径
manyPath = [NSHomeDirectory() stringByAppendingPathComponent:@"many.archiver"];[unarchiver finishDecoding];
2.使用NSUserDefault存取数据
定义NSUserDefault对象，存储数据
NSUserDefaults *defaults=[NSUserDefaults standardUserDefaults];
NSString *strValue=@"defaults string";
[defaults setObject:strValue forKey:@"strName"];
取出数据
NSString *strValue=[defaults objectForKey:@"strName"];
3.使用Sqlite数据库
首先引入框架libsqlite3.0
定义全局变量
sqlite3 *m_db;
//设置数据库路径
NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *strPath=[paths objectAtIndex:0];
NSString *strFinalPath=[strPath stringByAppendingString:@"personInfo.sqlite"];
//打开或创建数据库
if(sqlite3_open([strFinalPath UTF8String], &m_db)!=SQLITE_OK)
{
sqlite3_close(m_db);
NSLog(@"数据库打开失败");
}
创建数据表PERSONINFO
NSString *strCreateTable=@"CREATE TABLE IF NOT EXISTS PERSONINFO (ID INTEGER PRIMARY KEY AUTOINCREMENT,name TEXT,age INTEGER,address TEXT)";
[self executeSQl:strCreateTable];
插入数据
strInsertDate=[NSString stringWithFormat:@"INSERT INTO ‘%@‘ (‘%@‘,‘%@‘,‘%@‘)VALUES(‘%@‘,‘%@‘,‘%@‘)",@"PERSONINFO",@"name",@"address",@"age",userName,userAddress,userAge];
[self executeSQl:strInsertDate];
更新数据
strUpdate=[NSString stringWithFormat:@"UPDATE %@ SET address=‘%@‘ WHERE %@=‘%@‘",tableName,strAddress,valueName,strSearch];
[self executeSQl:strUpdate];
删除数据
strDelete=[NSString stringWithFormat:@"DELETE FROM %@ WHERE %@=‘%@‘",tableName,valueName,strSearch];
[self executeSQl:strDelete];
执行除查询以外的所有SQL语句
-(void)executeSQl:(NSString*)m_sql
{
char *error;
if(sqlite3_exec(m_db, [m_sql UTF8String], NULL, NULL, &error)!=SQLITE_OK)
{
sqlite3_close(m_db);
NSLog(@"SQL 语句执行失败");
}
}
查询数据库
sqlQuery = [NSString stringWithFormat:@"SELECT * FROM %@",strDataBase];
sqlQuery = [NSString stringWithFormat:@"SELECT * FROM %@ WHERE %@=‘%@‘",strDataBase,strValueName,strValue];
sqlite3_stmt * statement;
if (sqlite3_prepare_v2(m_db, [sqlQuery UTF8String], -1, &statement, nil) == SQLITE_OK) {
while (sqlite3_step(statement) == SQLITE_ROW) {
若存在，则获取数据
char *name = (char*)sqlite3_column_text(statement, 1);
NSString *nsNameStr = [[NSString alloc]initWithUTF8String:name];
int age = sqlite3_column_int(statement, 2);
NSString *nsAgeStr=[NSString stringWithFormat:@"%d",age];
char *address = (char*)sqlite3_column_text(statement, 3);
NSString *nsAddressStr = [[NSString alloc]initWithUTF8String:address];
}
}
sqlite3_close(m_db);
4.使用FMDB数据库(操作比Sqlite方便，需要引入类库)
定义全局变量
FMDatabase *m_db;
NSString *strFinalPath;
设置数据库路径
NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *strPath=[paths objectAtIndex:0];
strFinalPath=[strPath stringByAppendingString:@"personInfo.sqlite"];
创建数据库
m_db=[FMDatabase databaseWithPath:strFinalPath];
创建表
-(void)createTable
{
if ([m_db open]) {
NSString *sqlCreateTable = [NSString stringWithFormat:@"CREATE TABLE IF NOT EXISTS ‘%@‘ (‘%@‘ INTEGER PRIMARY KEY AUTOINCREMENT, ‘%@‘ TEXT, ‘%@‘ INTEGER, ‘%@‘ TEXT)",@"PERSONINFO",@"ID",@"name",@"age",@"adress"];
BOOL res = [m_db executeUpdate:sqlCreateTable];
if (!res) {
NSLog(@"error when creating db table");
} else {
NSLog(@"success to creating db table");
}
[m_db close];
}
}
插入数据
-(void)insertData
{
if ([m_db open]) {
NSString *insertSql1= [NSString stringWithFormat:
@"INSERT INTO ‘%@‘ (‘%@‘, ‘%@‘, ‘%@‘) VALUES (‘%@‘, ‘%@‘, ‘%@‘)",
@"PERSONINFO",@"name",@"age",@"adress", @"yt", @"123", @"xt"];
BOOL res = [m_db executeUpdate:insertSql1];
NSString *insertSql2 = [NSString stringWithFormat:
@"INSERT INTO ‘%@‘ (‘%@‘, ‘%@‘, ‘%@‘) VALUES (‘%@‘, ‘%@‘, ‘%@‘)",
@"PERSONINFO",@"name",@"age",@"adress", @"yy", @"124", @"bj"];
res = [m_db executeUpdate:insertSql2];
if (!res) {
NSLog(@"error when insert db table");
} else {
NSLog(@"success to insert db table");
}
[m_db close];
}
}
更新数据
-(void)updateData
{
if ([m_db open]) {
NSString *updateSql = [NSString stringWithFormat:
@"UPDATE ‘%@‘ SET ‘%@‘ = ‘%@‘ WHERE ‘%@‘ = ‘%@‘",
@"PERSONINFO",@"age",@"15",@"age",@"13"];
BOOL res = [m_db executeUpdate:updateSql];
if (!res) {
NSLog(@"error when update db table");
} else {
NSLog(@"success to update db table");
}
[m_db close];
}
}
删除数据
-(void)deleteData
{
if ([m_db open]) {
NSString *deleteSql = [NSString stringWithFormat:
@"delete from %@ where %@ = ‘%@‘",
@"PERSONINFO",@"name", @"张三"];
BOOL res = [m_db executeUpdate:deleteSql];
if (!res) {
NSLog(@"error when delete db table");
} else {
NSLog(@"success to delete db table");
}
[m_db close];
}
}
查询数据
-(void)searchData
{
if ([m_db open]) {
NSString * sql = [NSString stringWithFormat:
@"SELECT * FROM %@",@"PERSONINFO"];
FMResultSet * rs = [m_db executeQuery:sql];
while ([rs next]) {
int Id = [rs intForColumn:@"ID"];
NSString * name = [rs stringForColumn:@"name"];
NSString * age = [rs stringForColumn:@"age"];
NSString * address = [rs stringForColumn:@"address"];
NSLog(@"id = %d, name = %@, age = %@ address = %@", Id, name, age, address);
}
[m_db close];
}
}
使用异步操作读取更改数据示例
-(void)asyncQueue
{
FMDatabaseQueue * queue = [FMDatabaseQueue databaseQueueWithPath:strFinalPath];
dispatch_queue_t q1 = dispatch_queue_create("queue1", NULL);
dispatch_queue_t q2 = dispatch_queue_create("queue2", NULL);
dispatch_async(q1, ^{
for (int i = 0; i < 20; ++i) {
[queue inDatabase:^(FMDatabase *db2) {
NSString *insertSql1= [NSString stringWithFormat:
@"INSERT INTO ‘%@‘ (‘%@‘, ‘%@‘, ‘%@‘) VALUES (?, ?, ?)",
@"PERSONINFO", @"name", @"age", @"address"];
NSString * name = [NSString stringWithFormat:@"jack %d", i];
NSString * age = [NSString stringWithFormat:@"%d", 10+i];
BOOL res = [db2 executeUpdate:insertSql1, name, age,@"xt"];
if (!res) {
NSLog(@"error to inster data: %@", name);
} else {
NSLog(@"succ to inster data: %@", name);
}
}];
}
});
dispatch_async(q2, ^{
for (int i = 0; i < 20; ++i) {
[queue inDatabase:^(FMDatabase *db2) {
NSString *insertSql2= [NSString stringWithFormat:
@"INSERT INTO ‘%@‘ (‘%@‘, ‘%@‘, ‘%@‘) VALUES (?, ?, ?)",
@"PERSONINFO", @"name", @"age", @"address"];
NSString * name = [NSString stringWithFormat:@"lilei %d", i];
NSString * age = [NSString stringWithFormat:@"%d", 10+i];
BOOL res = [db2 executeUpdate:insertSql2, name, age,@"bj"];
if (!res) {
NSLog(@"error to inster data: %@", name);
} else {
NSLog(@"succ to inster data: %@", name);
}
}];
}
});
}
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原文地址：http://blog.csdn.net/qq_26790617/article/details/51335438
