FreeSql （十）更新資料

freesql提供豐富的資料庫更新功能，支援單條或批量更新，在特定的資料庫執行還可以返回更新後的記錄。

static ifreesql fsql = new freesql.freesqlbuilder()

.useconnectionstring(freesql.datatype.mysql, connectionstring)
.useautosyncstructure(true) //自動同步實體結構到資料庫
.build(); //請務必定義成 singleton 單例模式
class topic 
public int clicks 
public string title 
public datetime createtime 
}

只更新變化的屬性，依賴 freesql.repository

var repo = fsql.getrepository();

var item = repo.where(a => a.id == 1).first();  //此時快照 item
item.title = "newtitle";
repo.update(item); //對比快照時的變化
//update `topic` set `title` = @p_0
//where (`id` = 1)

是不是覺得先查詢再更新，囉嗦？

var repo = fsql.getrepository();

var item = new topic ;
repo.attach(item); //此時快照 item
item.title = "newtitle";
repo.update(item); //對比快照時的變化
//update `topic` set `title` = @p_0
//where (`id` = 1)

忽略更新 null 值的屬性

fsql.update()
.setsourceignore(item, col => col == null)
.executeaffrows();

var item = new topic ;

fsql.update()
.setsource(item)
.executeaffrows();
//update `topic` set `clicks` = @p_0, `title` = @p_1, `createtime` = @p_2 
//where (`id` = 1)
fsql.update()
.setsource(item)
.updatecolumns(a => new )
.executeaffrows();
//update `topic` set `title` = @p_0, `createtime` = @p_1 
//where (`id` = 1)
fsql.update()
.setsource(item)
.ignorecolumns(a => new )
.executeaffrows();
//update `topic` set `title` = @p_0 
//where (`id` = 1)
var items = new list();
for (var a = 0; a < 10; a++) items.add(new topic ", clicks = a * 100 });
fsql.update()
.setsource(items)
.executeaffrows();
//update `topic` set `clicks` = case `id` when 1 then @p_0 when 2 then @p_1 when 3 then @p_2 when 4 then @p_3 when 5 then @p_4 when 6 then @p_5 when 7 then @p_6 when 8 then @p_7 when 9 then @p_8 when 10 then @p_9 end, 
//`title` = case `id` when 1 then @p_10 when 2 then @p_11 when 3 then @p_12 when 4 then @p_13 when 5 then @p_14 when 6 then @p_15 when 7 then @p_16 when 8 then @p_17 when 9 then @p_18 when 10 then @p_19 end, 
//`createtime` = case `id` when 1 then @p_20 when 2 then @p_21 when 3 then @p_22 when 4 then @p_23 when 5 then @p_24 when 6 then @p_25 when 7 then @p_26 when 8 then @p_27 when 9 then @p_28 when 10 then @p_29 end 
//where (`id` in (1,2,3,4,5,6,7,8,9,10))
fsql.update()
.setsource(items)
.ignorecolumns(a => new )
.executeaffrows();
//update `topic` set `title` = case `id` when 1 then @p_0 when 2 then @p_1 when 3 then @p_2 when 4 then @p_3 when 5 then @p_4 when 6 then @p_5 when 7 then @p_6 when 8 then @p_7 when 9 then @p_8 when 10 then @p_9 end 
//where (`id` in (1,2,3,4,5,6,7,8,9,10))
fsql.update()
.setsource(items)
.set(a => a.createtime, datetime.now)
.executeaffrows();
//update `topic` set `createtime` = @p_0 
//where (`id` in (1,2,3,4,5,6,7,8,9,10))

指定 set 列更新後，setsource 將失效

返回值引數

描述setsource

t1 | ienumerable

更新資料，設定更新的實體

commandtimeout

int命令超時設定(秒)

withtransaction

dbtransaction

設定事務物件

withconnection

dbconnection

設定連線物件

tosql

string

返回即將執行的sql語句

executeaffrows

long

執行sql語句，返回影響的行數

executeupdated

list

執行sql語句，返回更新後的記錄

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