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                            ### 事務概述
1. 事務是指邏輯上的一組操作(多條SQL語句),組成這組操作的各個單元要么全都成功,要么全都失敗.
2. 事務作用:保證在一個事務中多次操作要么全都成功,要么全都失敗.
3. 事務有個前提,就是要使用同一個連接.

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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