How to build a JDBC application using Java?

1. Load the database driver. Usually the forName() static method of the Class class is used to load the driver. For example, the following code:

// 加载驱动
Class.forName(driverClass)

2. Obtain the database connection through DriverManager. DriverManager provides the following methods:

// 获取数据库连接
DriverManager.getConnection(String url,String user,String password);

3. Create a Statement object through the Connection object. Connection has the following three methods to create a Statement:

createStatement(): Create a basic Statement object.

prepareStatement(String sql): Creates a precompiled Statement object based on the incoming SQL statement.

prepareCall(String sql): Create a CallableStatement object based on the incoming SQL statement.

4. Use Statement to execute SQL statements. All Statements have the following three methods to execute SQL statements:

execute(): You can execute any SQL statement, but it is more troublesome.

executeUpdate(): Mainly used to execute DML and DDL statements. Executing a DML statement returns the number of rows affected by the SQL statement, and executing a DDL statement returns 0.

executeQuery(): Can only execute query statements, and after execution returns a ResultSet object representing the query results.

5. Operation result set. If the executed SQL statement is a query statement, the execution result will return a ResultSet object, which stores the results of the SQL statement query. Query results can be obtained by operating this object.

6. Recycle database resources, including closing ResultSet, Statement, Connection and other resources.

What is Java

Java is an object-oriented programming language that can write desktop applications, Web applications, distributed systems and embedded system applications.

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