iOS APP的数据存储方式有很多，NSUserDefault、plist、归档存到文本文件、sqlite3数据库、Coredata数据库。对于数据量大一些的数据存在数据库里是最好的选择，因为只是一个APP的数据存储（不像后台数据库），所以常用操作很简单，这里复习一下sqlite3的基本功能使用。
下面是一个具体的使用，YSTSwipSQLUtils是负责存储的一个类，对照着自己敲一遍就学会了。
@interface YSTSwipSQLUtils (){
sqlite3 *database;
}
@end
@implementation YSTSwipSQLUtils
static YSTSwipSQLUtils *sharedINstance;
+ (instancetype)shared{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedINstance = [[self alloc] init];
});
[sharedINstance openSQLiteDB];
return sharedINstance;
}
- (void)openSQLiteDB{
NSString *dbPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES).lastObject stringByAppendingPathComponent:@"swipData.db"];
sqlite3_open([dbPath UTF8String], &database);
NSString *sql = @"CREATE TABLE IF NOT EXISTS TRADEUNUPLOADSIGNS(USERCODE TEXT,TRADESN TEXT,SIGNTDK TEXT);";
[self createTableWithSQL:sql];
//
sql = @"CREATE TABLE IF NOT EXISTS PS008DATA(USERCODE TEXT,TRMNO TEXT,MERCID TEXT,ANOTHERNAME TEXT,USERMERCID TEXT);";
[self createTableWithSQL:sql];
sql = @"CREATE TABLE IF NOT EXISTS ICPARAMETERS(TRMNO TEXT,FLAG TEXT,RID1 TEXT,RID2 TEXT,RID3 TEXT,RID4 TEXT,RID5 TEXT,RID6 TEXT,RID7 TEXT,RID8 TEXT,RID9 TEXT,RID10 TEXT,RID11 TEXT,RID12 TEXT,AID1 TEXT,AID2 TEXT,AID3 TEXT,AID4 TEXT,AID5 TEXT,AID6 TEXT,AID7 TEXT,AID8 TEXT,AID9 TEXT,AID10 TEXT);";
[self createTableWithSQL:sql];
sql = @"create table if not exists mposlist (usercode text,mposname text)";
[self createTableWithSQL:sql];
}
- (void)createTableWithSQL:(NSString *)sql{
NSLog(@"创建表格%@",sql);
sqlite3_exec(database, [sql UTF8String], NULL, NULL, NULL);
int result = sqlite3_exec(database, [sql UTF8String], NULL, NULL, NULL);
if (SQLITE_OK == result) {
NSLog(@"sql:%@ success",sql);
}else{
NSLog(@"sql:%@ fail",sql);
}
}
-(void)closeSQLiteDB{
if (database) {
sqlite3_close(database);
}
}
// PS008数据保存
- (void)savePS008DataUserMercId:(NSString *)userMercId AndAnotherName:(NSString *)anotherName AndMercId:(NSString *)mercId WithUserCode:(NSString *)userCode AndTrmNo:(NSString *)trmNo{
// sql = @"CREATE TABLE IF NOT EXISTS PS008DATA(USERCODE TEXT,TRMNO TEXT,MERCID TEXT,ANOTHERNAME TEXT,USERMERCID TEXT);";
NSString *sql = @"SELECT * FROM WHERE USERCODE=? AND TRMNO=?;";
sqlite3_stmt *statement;
sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, nil);
sqlite3_bind_text(statement, 1, [userCode UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 2, [trmNo UTF8String], -1, SQLITE_TRANSIENT);
if (sqlite3_step(statement) != SQLITE_ROW) {
sql = @"INSERT INTO PS008DATA(USERCODE, TRMNO, MERCID, ANOTHERNAME, USERMERCID) VALUES(?,?,?,?,?);";
sqlite3_stmt *statement2;
sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement2, nil);
sqlite3_bind_text(statement2, 1, [userCode UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement2, 2, [trmNo UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement2, 3, [mercId UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement2, 4, [anotherName UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement2, 5, [userMercId UTF8String], -1, SQLITE_TRANSIENT);
if (sqlite3_step(statement2) == SQLITE_DONE) {
NSLog(@"保存成功");
}
sqlite3_step(statement2);
sqlite3_finalize(statement2);
sqlite3_finalize(statement);
}else{
sql = @"UPDATE PS008DATA SET USERCODE=?, TRMNO=?, MERCID=?, ANOTHERNAME=?, USERMERCID=?; WHERE USERCODE=? AND TRMNO=?;";
sqlite3_stmt *statement3;
sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement3, nil);
sqlite3_bind_text(statement3, 1, [userCode UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement3, 2, [trmNo UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement3, 3, [mercId UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement3, 4, [anotherName UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement3, 5, [userMercId UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement3, 6, [userCode UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement3, 7, [trmNo UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_step(statement3);
sqlite3_finalize(statement3);
sqlite3_finalize(statement);
}
}
- (void)deletePS008DataWithUserCode:(NSString *)userCode AndTrmNo:(NSString *)trmNo{
NSString *sql = @"DELETE FROM PS008DATA WHERE USERCODE=? AND TRMNO=?;";
sqlite3_stmt *statement;
sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, nil);
sqlite3_bind_text(statement, 1, [userCode UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 2, [trmNo UTF8String], -1, SQLITE_TRANSIENT);
int result=sqlite3_step(statement);
if (result==SQLITE_DONE){
NSLog(@"删除PS008成功");
}else{
NSLog(@"删除PS008失败");
}
sqlite3_finalize(statement);
}
- (BOOL)deletePs008DataWithUserCode:(NSString *)userCode {
NSString *sql=@"DELETE FROM PS008DATA WHERE USERCODE=?;";
sqlite3_stmt *statement;
sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, nil);
sqlite3_bind_text(statement, 1, [userCode UTF8String], -1, SQLITE_TRANSIENT);
int result=sqlite3_step(statement);
sqlite3_finalize(statement);
return (result == SQLITE_DONE);
}
// sql = @"CREATE TABLE IF NOT EXISTS PS008DATA(USERCODE TEXT,TRMNO TEXT,MERCID TEXT,ANOTHERNAME TEXT,USERMERCID TEXT);";
- (NSMutableDictionary *)getPS008DataInUserCode:(NSString *)userCode AndTrmNo:(NSString *)trmNo{
NSString *sql = @"SELECT USERCODE, TRMNO, MERCID, ANOTHERNAME, USERMERCID FROM PS008DATA WHERE USERCODE=? AND TRMNO=?;";
sqlite3_stmt *statement;
sqlite3_prepare_v2(database, [sql UTF8String], -1, &statement, nil);
sqlite3_bind_text(statement, 1, [userCode UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(statement, 2, [trmNo UTF8String], -1, SQLITE_TRANSIENT);
NSMutableDictionary *result = [NSMutableDictionary dictionary];
if (sqlite3_step(statement) == SQLITE_ROW) {
result[@"userCode"] = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)?:""];
result[@"trmNo"] = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 1)?:""];
result[@"mercId"] = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 2)?:""];
result[@"anotherName"] = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 3)?:""];
result[@"userMercId"] = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 4)?:""];
}
sqlite3_finalize(statement);
return result;
}
更多sqlite语句使用参考
sqlite3 基本使用