2.1 MapperProxy#invoker public Object invoke(Object proxy, Method method, Object args) throws Throwable else if (SqlCommandType.SELECT = command. Create a statement by invoking this method as shown below. 2) Statement.executeBatch() now throws a BatchUpdateException() as required by the JDBC spec. You can create an object of this interface using the createStatement() method of the connection interface. Where JDBC talks about 'executing the statements as a unit', it means executing the statements in one round trip to the backend for better performance, it does not mean executing the statements in a transaction. Warm Tip: At the end of this article, a detailed Mybatis Sharing JDBC statement execution flow chart will be given. The Statement interface represents the static SQL statement, it is used to create and execute general purpose SQL statements using Java programs. Next, it is analyzed from the point of view of source code. Source code parsing SQL execution process In order to facilitate the source code analysis of this article, the method call sequence diagram of the core class at Mybatis level is given first.
dit: Logs ALL JDBC calls except for ResultSets. jdbc.sqltiming: Logs the SQL, post-execution, including timing statistics on how long the SQL took to execute. Starting with the theme of this article, we analyze the popularity of Mybatis executing SQL statements by means of source code, and use sharding-jdbc, a database sub-database and sub-table middleware, which is version 1.4.1 of sharding-jdbc. SQL executed within a prepared statement is automatically shown with it's bind arguments replaced with the data bound at that position, for greatly increased readability. It is suggested to read the first three articles in this series, focusing on the initialization process of Mybatis Mapper class, because in Mybatis, Mapper is the entry to execute SQL statement, similar to the following code: UserService implements IUserService UserMapper userMapper We will use the Statement interface to execute normal operations DB. The objects of the Statement, PreparedStatement, and CallableStatement can be created using the Connection object. This article has some relevance with the previous one. After the registration of Driver is done, we can establish the connection using the getConnection () method in DriverManager. This article will introduce the whole process of execution of Mybatis SQL statement in detail.
1, Scanning and Construction of Mapper Objects Initialized by Mybatis MapperProxy for Source Code AnalysisĢ, Creation process of Mybatis MappedStatement for source code analysisģ, Detailed description of four basic components for Mybatis to execute SQL
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