一、連接數據庫
1、下載SQLserver對應的JDBC驅動;
2、將JDBC驅動導入項目中;
測試是否導入成功
代碼如下:
package com.test;
public class Demo1 {
//驅動路徑
private static final String DBDRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//程序入口函數
public static void main(String[] args) {
try {
//加載驅動程序
Class.forName(DBDRIVER);
} catch (Exception e) {
e.printStackTrace();
}
}
}
程序正常運行則證明數據庫驅動程序配置成功。
3、創建數據庫連接
連接數據庫名爲:”testdatabase”的數據庫,數據庫登錄用戶名:”sa”,密碼:”123456”的數據庫。
代碼如下:
package com.test;
import java.sql.*;
public class Demo1 {
//驅動路徑
private static final String DBDRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//數據庫地址
private static final String DBURL = "jdbc:sqlserver://localhost:1434;DataBaseName=testdatabase";
//數據庫登錄用戶名
private static final String DBUSER = "sa";
//數據庫用戶密碼
private static final String DBPASSWORD = "123456";
//數據庫連接
public static Connection conn = null;
//程序入口函數
public static void main(String[] args) {
try {
//加載驅動程序
Class.forName(DBDRIVER);
//連接數據庫
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
System.out.println(conn);
} catch (Exception e) {
e.printStackTrace();
}
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
程序運行結果不爲空則證明數據庫連接正確。
二、數據庫操作
1、查詢數據
例:查詢數據庫”testdatabase”中”students”表的數據。
代碼如下:
package com.test;
import java.sql.*;
public class Demo1 {
//驅動路徑
private static final String DBDRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//數據庫地址
private static final String DBURL = "jdbc:sqlserver://localhost:1434;DataBaseName=testdatabase";
//數據庫登錄用戶名
private static final String DBUSER = "sa";
//數據庫用戶密碼
private static final String DBPASSWORD = "123456";
//數據庫連接
public static Connection conn = null;
//數據庫操作
public static Statement stmt = null;
//數據庫查詢結果集
public static ResultSet rs = null;
//程序入口函數
public static void main(String[] args) {
try {
//加載驅動程序
Class.forName(DBDRIVER);
//連接數據庫
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
//實例化Statement對象
stmt = conn.createStatement();
rs = stmt.executeQuery("select * from students");
while(rs.next()){
String Id = rs.getString(1);
String Name = rs.getString(2);
String Age = rs.getString(3);
String Sex = rs.getString(4);
System.out.print("學號:"+Id);
System.out.print(" 姓名:"+Name);
System.out.print(" 年齡:"+Age);
System.out.println(" 性別:"+Sex);
System.out.println("------------------------------------");
}
stmt.close();
conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
2、更新數據
例:向數據庫”testdatabase”中的”students”表添加一條記錄。
代碼如下:
package com.demo;
import java.sql.*;
public class Demo_sql {
//驅動路徑
public static final String DBDRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//數據庫地址
public static final String DBURL = "jdbc:sqlserver://localhost:1434;DatabaseName=testdatabase";
//數據庫登錄用戶名
public static final String DBUSER = "sa";
//數據庫用戶密碼
public static final String DBPASSWORD = "123456";
//數據庫連接
public static Connection conn = null;
//用於執行SQL語句
public static Statement stmt = null;
//SQL語句
public static final String SQLSTR = "insert into students values('201701170002','王思','21','女')";
public static void main(String[] args) {
try {
Class.forName(DBDRIVER);
System.out.println("成功連接!");
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
conn = DriverManager.getConnection(DBURL, DBUSER, DBPASSWORD);
stmt = conn.createStatement();//實例化statement
stmt.executeUpdate(SQLSTR);
System.out.println("成功添加!");
} catch (SQLException e) {
e.printStackTrace();
}finally{
try {
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}