JAVA：对数据库的一系列操作代码

插入数据
import java.sql.*;

/**
* @version 2012-02-22
* @author
*/
public class InsertDemo {
public static void main(String[] args) throws SQLException {
Connection conn = null;
Statement stmt = null;
String JDriver="com.microsoft.sqlserver.jdbc.SQLServerDriver";//SQL鏁版嵁搴撳紩鎿�
String connectDB="jdbc:sqlserver://localhost:1433;DatabaseName=JDBCTest";//鏁版嵁婧惵�
String user="sa";
String pwd="sql";
try {
// 动态导入数据库的驱动
Class.forName(JDriver);
// 获取数据库链接
conn = DriverManager.getConnection(connectDB,user,pwd);
// 创造SQL语句
String sql = "INSERT INTO JDBCTestTable ( user_name, user_password ) VALUES ( 'balabala', '123456' )";
// 执行SQL语句
stmt = conn.createStatement();
stmt.executeUpdate(sql);
System.out.println("插入数据成功");
} catch (Exception e) {
e.printStackTrace();
stmt.close();
conn.close();
}
}
}

修改数据
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class UpdateDemo {

public static void main(String[] args) throws SQLException {
Connection conn = null;
Statement stmt = null;
try {
// 动态导入数据库的驱动
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
// 获取数据库链接
conn = DriverManager.getConnection(
"jdbc:sqlserver://localhost:1433;DatabaseName=JDBCTest",
"sa", "sql");
// 创造SQL语句
String sql = "UPDATE JDBCTestTable SET user_password = '456' WHERE user_name = 'Eric'";
// 执行SQL语句
stmt = conn.createStatement();
stmt.executeUpdate(sql);
System.out.println("更新数据成功");
} catch (Exception e) {
e.printStackTrace();
stmt.close();
conn.close();
}
}
}

删除数据
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;

public class DeleteDemo {

public static void main(String[] args){
String JDriver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=JDBCTest";
String user="sa";
String password="sql";
try{
Class.forName(JDriver);// 动态导入数据库的驱动
Connection conn=DriverManager.getConnection(url, user, password);// 获取数据库链接
String query="DELETE FROM JDBCTestTable WHERE user_name='Eric'";// 创造SQL语句
Statement stmt=conn.createStatement();// 执行SQL语句
stmt.executeUpdate(query);
System.out.println("删除数据成功");
stmt.close();
conn.close();
}catch(Exception e){
e.printStackTrace();
}
}
}

查询数据
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class QueryDemo {

public static void main(String[] args){
String JDriver="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String url="jdbc:sqlserver://127.0.0.1:1433;DatabaseName=JDBCTest";
String user="sa";
String password="sql";
try{
Class.forName(JDriver);// 动态导入数据库的驱动
Connection conn=DriverManager.getConnection(url, user, password);// 获取数据库链接
String query="SELECT * FROM JDBCTestTable";// 创造SQL语句
Statement stmt=conn.createStatement();// 执行SQL语句
ResultSet rs=stmt.executeQuery(query);
while(rs.next()){
System.out.println(rs.getString("user_name")+":"+rs.getString(2));
//密码字段的编号从1开始，密码排第二位
}
System.out.println("查询数据成功");
rs.close();
stmt.close();
conn.close();
}catch(Exception e){
e.printStackTrace();
}
}
}