SQLite one line SQL implementation updates if there is one, inserts if there is none, multiple conditions, complex conditions

SQLite a line SQL Update if there is one, insert if there is none , Multiple conditions , Complex conditions

Sample code ：https://github.com/miqt/MultiProgressKV/blob/master/MultiProgressKV/src/main/java/com/miqt/multiprogresskv/DBHelper.java

For example, you want to implement the following logic

if （db has name == Xiao Ming  &&  height  == 170cm）
	update ....
else 
	insert ....

You can refer to the following SQL:

CREATE TABLE [TABLE_NAME](
  [id] INTEGER PRIMARY KEY AUTOINCREMENT, 
  [name] TEXT NOT NULL , 
  [attr] TEXT NOT NULL , 
  [value] TEXT NOT NULL );

CREATE UNIQUE INDEX [TABLE_NAME]
ON [TABLE_NAME](
  [name], 
  [attr]);

CREATE UNIQUE INDEX [TABLE_NAME] Declared that only name, and attr The unique index is calculated only when it is repeated , This applies to scenarios like inserting a book , A book can only have one title and author , And a separate title , And the author himself , It may correspond to many books .

The following statement executes , There are updates , If nothing, the effect of inserting , following SQL Executing multiple times will only produce one row of results , And modify name, perhaps attr Any column , A new one will be inserted .

REPLACE INTO TABLE_NAME
  (
    name ,
    attr ,
    value
  )
VALUES
  (
    '《 Journey to the west 》' ,
    ' author ' ,  
    ' Wu chengen '
  ) ;