* 步骤：
1. 导入驱动jar包 mysql-connector-java-5.1.37-bin.jar
1.复制mysql-connector-java-5.1.37-bin.jar到项目的libs目录下
2.右键-->Add As Library
2. 注册驱动
3. 获取数据库连接对象 Connection
4. 定义sql
5. 获取执行sql语句的对象 Statement
6. 执行sql，接受返回结果
7. 处理结果
8. 释放资源
* 代码实现：
//1. 导入驱动jar包
//2.注册驱动
Class.forName("com.mysql.jdbc.Driver");
//3.获取数据库连接对象
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/db3", "root", "root");
//4.定义sql语句
String sql = "update account set balance = 500 where id = 1";
//5.获取执行sql的对象 Statement
Statement stmt = conn.createStatement();
//6.执行sql
int count = stmt.executeUpdate(sql);
//7.处理结果
System.out.println(count);
//8.释放资源
stmt.close();
conn.close();
Statement stmt = null;
Connection conn = null;
try {
//1. 注册驱动
Class.forName("com.mysql.jdbc.Driver");
//2. 定义sql
String sql = "insert into account values(null,'王五',3000)";
//3.获取Connection对象
conn = DriverManager.getConnection("jdbc:mysql:///db3", "root", "root");
//4.获取执行sql的对象 Statement
stmt = conn.createStatement();
//5.执行sql
int count = stmt.executeUpdate(sql);//影响的行数
//6.处理结果
System.out.println(count);
if(count > 0){
System.out.println("添加成功！");
}else{
System.out.println("添加失败！");
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally {
//stmt.close();
//7. 释放资源
//避免空指针异常
if(stmt != null){
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if(conn != null){
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
} |
|
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