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;

}