OC中数据库操作（类方法）
1.创建表格
+(sqlite3 *)getMySQL{
sqlite3 *mySQL;
//打开数据库，如果没有就创建
//拼接路径
NSString *docPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [docPath stringByAppendingPathComponent:@"Worker.SQL"];
NSLog(@"%@",filePath);
//调用open方法
if (sqlite3_open([filePath UTF8String], &mySQL) != SQLITE_OK) {
NSLog(@"open error");
return 0;
}
NSLog(@"open OK");
//3.创建表的sql语句
NSString *createTableSql = @"create table if not exists Workers (id integer primary key autoincrement,name varchar(30),address varchar(40),image blob)";
char *errMsg = NULL;
//写入数据库
if (sqlite3_exec(mySQL, [createTableSql UTF8String], NULL, NULL, &errMsg)) {
NSLog(@"%s",errMsg);
return 0;
}
NSLog(@"create table ok");
return mySQL;
}
2.表格里插入语句
+(void)insertSqlWithName:(NSString *)name Address:(NSString *)address Image:(UIImage *)image{
sqlite3 *database = [SQLFactory getMySQL];
NSString *insertSql = @"insert into Workers(name,address,image) values(?,?,?)";
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(database, [insertSql UTF8String], -1, &statement, NULL) != SQLITE_OK) {
NSLog(@"insert prepare error");
return;
}else{
NSLog(@"insert prepare OK");
NSData *imgData = UIImagePNGRepresentation(image);
sqlite3_bind_text(statement, 1, [name UTF8String], -1, NULL);
sqlite3_bind_text(statement, 2, [address UTF8String], -1, NULL);
sqlite3_bind_blob(statement, 3, [imgData bytes], (int)imgData.length, NULL);
if (sqlite3_step(statement) != SQLITE_DONE) {
NSLog(@"执行插入语句失败");
}else{
NSLog(@"执行插入语句成功");
}
}
}
3，读取数据
+(NSMutableArray *)showSqlWithSeletType:(NSString *)selectType{
NSMutableArray *workerModelsArray = [NSMutableArray array];
sqlite3 *sql = [SQLFactory getMySQL];
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(sql, [selectType UTF8String], -1, &statement, NULL) != SQLITE_OK) {
NSLog(@"read prepare error");
return 0;
}else{
NSLog(@"read prepare OK");
while (sqlite3_step(statement) == SQLITE_ROW) {
WorkerModel *model = [[WorkerModel alloc]init];
char *name = (char *)sqlite3_column_text(statement, 1);
model.workerName = [NSString stringWithUTF8String:name];
char *address = (char *)sqlite3_column_text(statement, 2);
model.workerAddress = [NSString stringWithUTF8String:address];
Byte *bytes = (Byte *)sqlite3_column_blob(statement, 3);
int length = sqlite3_column_bytes(statement, 3);
NSData *imgData = [NSData dataWithBytes:bytes length:length];
UIImage *img = [UIImage imageWithData:imgData];
model.workerIconImage = img;
[workerModelsArray addObject:model];
}
}
return workerModelsArray;
}
