鏈接:https://blog.csdn.net/JAVA_START008/article/details/53073875?locationNum=3&fps=1

1. 1、創建JDBC連接數據庫類：

1. public class DBConnection {
2. privatestatic String url = "jdbc:oracle:thin:@localhost:1521:orcl";
3. privatestatic String user = "scott";
4. privatestatic String password = "tiger";
5. static{
6. try{
7. //加載驅動類
8. Class.forName("oracle.jdbc.driver.OracleDriver");
9. }catch (ClassNotFoundException e) {
10. e.printStackTrace();
11. }
12. }
13. publicstatic Connection getConn(){
14. //獲取連接對象
15. Connectioncon = null;
16. try{
17. con= DriverManager.getConnection(url, user, password);
18. }catch (SQLException e) {
19. e.printStackTrace();
20. }
21. return con;
22. }
23. public static voidclose(Connectionconn,PreparedStatement ps, ResultSet rs){
24. if(rs!= null){
25. try{
26. rs.close();
27. }catch (SQLException e) {
28. e.printStackTrace();
29. }
30. }
31. if(ps!= null){
32. try{
33. ps.close();
34. }catch (SQLException e) {
35. e.printStackTrace();
36. }
37. }
38. if(conn!= null){
39. try{
40. conn.close();
41. }catch (SQLException e) {
42. e.printStackTrace();
43. }
44. }
45. }
46. }

1. <span style="font-family:monospace;white-space:pre;background-color:rgb(240,240,240);">2、創建emp 表所對應的的實體類：</span>

1. public class Emp {
3. private int empno;
4. private String ename;
5. private String job;
6. private int mgr;
7. private Date hiredate;
8. private double sal;
9. private double comm;
10. private int deptno;
12. public Emp(){}
14. public Emp(int empno, String ename, String job, int mgr, Date hiredate,
15. double sal, double comm, int deptno) {
16. super();
17. this.empno = empno;
18. this.ename = ename;
19. this.job = job;
20. this.mgr = mgr;
21. this.hiredate = hiredate;
22. this.sal = sal;
23. this.comm = comm;
24. this.deptno = deptno;
25. }
27. @Override
28. public String toString() {
29. return "Emp [empno=" + empno + ", ename=" + ename + ", job=" + job
30. + ", mgr=" + mgr + ", hiredate=" + hiredate + ", sal=" + sal
31. + ", comm=" + comm + ", deptno=" + deptno + "]";
32. }
33. public int getEmpno() {
34. return empno;
35. }
36. public void setEmpno(int empno) {
37. this.empno = empno;
38. }
39. public String getEname() {
40. return ename;
41. }
42. public void setEname(String ename) {
43. this.ename = ename;
44. }
45. public String getJob() {
46. return job;
47. }
48. public void setJob(String job) {
49. this.job = job;
50. }
51. public int getMgr() {
52. return mgr;
53. }
54. public void setMgr(int mgr) {
55. this.mgr = mgr;
56. }
57. public Date getHiredate() {
58. return hiredate;
59. }
60. public void setHiredate(Date hiredate) {
61. this.hiredate = hiredate;
62. }
63. public double getSal() {
64. return sal;
65. }
66. public void setSal(double sal) {
67. this.sal = sal;
68. }
69. public double getComm() {
70. return comm;
71. }
72. public void setComm(double comm) {
73. this.comm = comm;
74. }
75. public int getDeptno() {
76. return deptno;
77. }
78. public void setDeptno(int deptno) {
79. this.deptno = deptno;
80. }
82. }

1. <span style="font-family:Arial, Helvetica, sans-serif;"> </span><span style="font-family:Arial, Helvetica, sans-serif;">3、創建實現業務操作類，實現增刪改查具體方法：</span>

1. public class EmpDao {
3. /**
4. * 增加一條數據
5. * insert into emp values(....)
6. */
7. public boolean addOne(Emp emp){
8. boolean f = false;
10. //2.定義sql語句
11. String sql = "insert into emp values(?,?,?,?,?,?,?,?)";
12. //1.獲取數據庫連接對象
13. //3.獲取preparedStatement對象，以發送sql語句到數據庫
14. try (Connection conn = DBConnection.getConn();PreparedStatement ps = conn.prepareStatement(sql)){
15. //通過ps對象給sql語句設置參數？
16. ps.setInt(1, emp.getEmpno());
17. ps.setString(2, emp.getEname());
18. ps.setString(3, emp.getJob());
19. ps.setInt(4, emp.getMgr());
20. ps.setDate(5, emp.getHiredate());
21. ps.setDouble(6, emp.getSal());
22. ps.setDouble(7, emp.getComm());
23. ps.setInt(8, emp.getDeptno());
24. //4.執行sql語句
25. int row = ps.executeUpdate();
26. if(row != 0){
27. f = true;
28. }
29. } catch (SQLException e) {
30. e.printStackTrace();
31. }
32. return f;
33. }
35. /**
36. * 根據ID刪除
37. * @param id
38. * @return
39. */
40. public boolean delById(int id){
41. boolean f = false;
42. String sql = "delete from emp where empno=?";
43. try(Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(sql);) {
44. ps.setInt(1, id);
45. int row = ps.executeUpdate();
46. if(row > 0){
47. f = true;
48. }
49. } catch (SQLException e) {
50. e.printStackTrace();
51. }
52. return f;
53. }
55. /**
56. * 根據id修改
57. * @return
58. */
59. public boolean updateById(Emp emp){
60. boolean b = false;
61. String s = "update emp set ename=?,job=?,mgr=?,sal=?,comm=?,deptno=?,hiredate=? where empno=?";
62. try (Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(s);){
63. ps.setString(1, emp.getEname());
64. ps.setString(2, emp.getJob());
65. ps.setInt(3, emp.getMgr());
66. ps.setDouble(4, emp.getSal());
67. ps.setDouble(5, emp.getComm());
68. ps.setInt(6, emp.getDeptno());
69. ps.setDate(7, emp.getHiredate());
70. ps.setInt(8, emp.getEmpno());
71. int row = ps.executeUpdate();
72. if(row > 0){
73. b = true;
74. }
75. } catch (SQLException e) {
76. e.printStackTrace();
77. }
78. return b;
79. }
81. /**
82. * 根據id查詢
83. * @param id
84. * @return
85. */
86. public Emp queryById(int id){
87. Emp emp = null;
88. ResultSet rs = null;
89. String sql = "select * from emp where empno=?";
90. try (Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(sql);){
91. ps.setInt(1, id);
92. //執行
93. rs = ps.executeQuery();
94. //結果集光標向下移動一行，如果查詢到數據，返回true，否則返回false
95. boolean b = rs.next();
96. if(b){
97. //查詢到了數據,取出數據
98. int empno = rs.getInt("EMPNO");
99. String ename = rs.getString(2);
100. String job = rs.getString(3);
101. int mgr = rs.getInt(4);
102. Date hiredate = rs.getDate(5);
103. double sal = rs.getDouble(6);
104. double comm = rs.getDouble(7);
105. int deptno = rs.getInt(8);
106. //將數據封裝成對象
107. // emp = new Emp();
108. // emp.setEmpno(empno);
109. emp = new Emp(empno,ename,job,mgr,hiredate,sal,comm,deptno);
110. }
111. } catch (SQLException e) {
112. e.printStackTrace();
113. } finally{
114. try {
115. rs.close();
116. } catch (SQLException e) {
117. e.printStackTrace();
118. }
119. }
120. return emp;
121. }
123. /**
124. * 查詢全部數據
125. * @return
126. */
127. public List<Emp> queryAll(){
128. List<Emp> list = new ArrayList<>();
129. String sql = "select * from emp";
130. try (Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(sql);ResultSet rs = ps.executeQuery();){
131. //只要rs光標所在當前行有數據，rs.next()就返回true
132. while(rs.next()){
133. //取出當前行數據，封裝成一個Emp對象，放入list集合
134. int empno = rs.getInt("EMPNO");
135. String ename = rs.getString(2);
136. String job = rs.getString(3);
137. int mgr = rs.getInt(4);
138. Date hiredate = rs.getDate(5);
139. double sal = rs.getDouble(6);
140. double comm = rs.getDouble(7);
141. int deptno = rs.getInt(8);
142. list.add(new Emp(empno,ename,job,mgr,hiredate,sal,comm,deptno));
143. }
144. } catch (SQLException e) {
145. e.printStackTrace();
146. }
147. return list;
148. }
150. /**
151. * 調用無返回值的存儲過程
152. * @throws Exception
153. */
154. public void callPro110() throws Exception{
155. Connection conn = DBConnection.getConn();
156. CallableStatement cs = conn.prepareCall("{call pro110}");
157. //執行
158. cs.execute();
159. }
161. }

JDBC連接Oracle數據庫後實現對emp 表數據的增刪改查(轉載)