2020.12.18 일지
PreparedStatement.java
package day08;
import java.sql.*;
//PreparedStatement : 준비된 스테이트먼트
class A {
String url = "jdbc:oracle:thin:@127.0.0.1:1521:JAVA";
String usr = "JDBC";
String pwd = "JAVA";
String tname = "JDBCT";
Connection con;
PreparedStatement pstmt1, pstmt2, pstmt3;
String sql1 = "select * from "+tname+ " order by NO desc";
String sql2 = "select * from "+tname+ " where NAME like ?";
String sql3 = "insert into "+tname+" values(?, ?, ?, SYSDATE)";
A(){
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(url, usr, pwd);
pstmt1 = con.prepareStatement(sql1);
pstmt2 = con.prepareStatement(sql2);
pstmt3 = con.prepareStatement(sql3);
}catch(ClassNotFoundException cnfe) {
pln("드라이버가 클래스패스 걸리지 않았음");
}catch(SQLException se) {
}
}
void selectD() {
ResultSet rs = null;
try {
rs = pstmt1.executeQuery();
int count = 0;
System.out.println("NO\tNAME\tPHONE\t\tRDATE");
System.out.println("---------- ---------- ----------- --------");
while(rs.next()) {
int no = rs.getInt(1);
String name = rs.getString(2);
String phone = rs.getString(3);
Date rdate = rs.getDate(4);
System.out.println(no+"\t"+name+"\t"+phone+"\t"+rdate);
count++;
}
System.out.println("---------- ---------- ----------- --------");
System.out.println("총 "+count+"개 데이터 검색 완료");
}catch(SQLException se) {
}finally {
try {
rs.close();
}catch(SQLException se) {}
}
}
void selectD(String na) { //검색문: 속도 빠름
ResultSet rs = null;
try {
pstmt2.setString(1, "%"+na+"%");
rs = pstmt2.executeQuery();
int count = 0;
System.out.println("NO\tNAME\tPHONE\t\tRDATE");
System.out.println("---------- ---------- ----------- --------");
while(rs.next()) {
int no = rs.getInt(1);
String name = rs.getString(2);
String phone = rs.getString(3);
Date rdate = rs.getDate(4);
System.out.println(no+"\t"+name+"\t"+phone+"\t"+rdate);
count++;
}
System.out.println("---------- ---------- ----------- --------");
System.out.println("총 "+count+"개 데이터 검색 완료");
}catch(SQLException se) {
}finally {
try {
rs.close();
}catch(SQLException se) {}
}
}
void insertD(int no, String name, String phone) { //가독성
try {
pstmt3.setInt(1, no);
pstmt3.setString(2, name);
pstmt3.setString(3, phone);
int i = pstmt3.executeUpdate();
pln(i+"개의 행이 입력됨");
}catch(SQLException se) {}
}
void pln(String str) {
System.out.println(str);
}
void p(String str) {
System.out.print(str);
}
public static void main(String[] args) {
A a = new A();
a.selectD();
}
}CallableStatement.java
create or replace procedure INCRE(N in EMP.EMPNO%TYPE, R in NUMBER)
is
newPay NUMBER;
begin
select SAL into newPay from EMP where EMPNO=N;
newPay := newPay + newPay * R;
update EMP set SAL=newPay where EMPNO=N;
commit;
end;
/
-- call incre(7369, 0.1);
-- select EMPNO, SAL from EMP2 where EMPNO=7369;먼저 scott/tiger 계정으로 들어가서 위 procedure를 실행시켜준다.
그러고, 하단 java를 실행시켜주면 된다.
package day08;
import java.sql.*;
//CallableStatement
class B {
Connection con;
CallableStatement cstmt;
PreparedStatement pstmt;
String url = "jdbc:oracle:thin:@127.0.0.1:1521:JAVA";
String usr = "scott";
String pwd = "tiger";
String sql = "call incre(?, ?)";
String sqlS = "select EMPNO, SAL from EMP where EMPNO=?";
B(){
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(url, usr, pwd);
cstmt = con.prepareCall(sql);
pstmt = con.prepareStatement(sqlS);
}catch(ClassNotFoundException cnfe) {
pln("드라이버가 클래스패스 걸리지 않았음");
}catch(SQLException se) {
}
}
void exe(int empno, float rate) {
try {
cstmt.setInt(1, empno);
cstmt.setFloat(2, rate);
cstmt.execute();
pln("프로시져 호출 완료");
}catch(SQLException se) {
}
showResult(empno);
}
void showResult(int empno) { //pstmt를 이용하여 구현하시오
ResultSet rs = null;
try {
pstmt.setInt(1, empno);
rs = pstmt.executeQuery();
double sal = 0.0;
pln("EMPNO \t SAL");
pln("-----------------");
if(rs.next()) {
//empno = rs.getInt(1);
sal = rs.getDouble(2);
pln(empno +"\t"+ sal);
}
}catch(SQLException se) {
}finally {
try {
rs.close();
}catch(SQLException se) {}
}
}
void pln(String str) {
System.out.println(str);
}
void p(String str) {
System.out.print(str);
}
public static void main(String[] args) {
B b = new B();
b.exe(7902, 0.1f);
}
}DynamicCursor.java
동적 커서로 만들어주는 옵션과, rs.next(); rs.previous(); rs.beforeFirst(); //to BOF rs.afterLast(); //to EOF 커서의 위치를 이동시켜주는 메소드들을 이용한 자바 파일이다.
package day08;
import java.sql.*;
class C {
String url = "jdbc:oracle:thin:@127.0.0.1:1521:JAVA";
String usr = "JDBC";
String pwd = "JAVA";
String tname = "JDBCT";
String sql = "select * from "+tname+" order by NO";
Connection con;
Statement stmt;
ResultSet rs;
C(){
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(url, usr, pwd);
stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
/*
ResultSet.TYPE_FORWARD_ONLY, ResultSet.TYPE_SCROLL_INSENSITIVE, or ResultSet.TYPE_SCROLL_SENSITIVE
ResultSet.CONCUR_READ_ONLY or ResultSet.CONCUR_UPDATABLE
* */
}catch(ClassNotFoundException cnfe) {
pln("드라이버가 클래스패스 걸리지 않았음");
}catch(SQLException se) {
pln("se: " + se);
}
}
void createRs() {
try {
rs = stmt.executeQuery(sql);
forward(rs);
}catch(SQLException se) {}
}
void forward(ResultSet rs) {
try {
pln("< 순방향 >");
pln("NO \t NAME \t PHONE \t RDATE");
while(rs.next()) {
int no = rs.getInt(1);
String name = rs.getString(2);
String phone = rs.getString(3);
Date rdate = rs.getDate(4);
pln(no+"\t"+name+"\t"+phone+"\t"+rdate);
}
back(rs);
}catch(SQLException se) {}
}
void back(ResultSet rs) { //구현하시오
try {
pln("< 역방향 >");
pln("NO \t NAME \t PHONE \t RDATE");
while(rs.previous()) {
int no = rs.getInt(1);
String name = rs.getString(2);
String phone = rs.getString(3);
Date rdate = rs.getDate(4);
pln(no+"\t"+name+"\t"+phone+"\t"+rdate);
}
}catch(SQLException se) {}
}
void pln(String str) {
System.out.println(str);
}
void p(String str) {
System.out.print(str);
}
public static void main(String[] args) {
C c =new C();
c.createRs();
}
}JTableArray.java
package day08;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
public class JT1 extends JFrame {
JTable t;
Object[] columnNames = {"번호", "이름", "연락처", "날짜"};
Object rowData[][] = {
{"10", "홍길동", "01012341234", "20/12/18"},
{"20", "이순신", "01012341235", "20/12/18"},
{"30", "강감찬", "01012341236", "20/12/18"}
};
void init() {
Container cp = getContentPane();
t = new JTable(rowData, columnNames); // JTable(Object rowData[][], Object columnNames[])
JScrollPane sp = new JScrollPane(t);
cp.add(sp);
test();
setUI();
}
void test() {
//(1) 임의의 데이터 ( get/set )
t.setValueAt("신촌", 1, 2);
Object data = t.getValueAt(1, 2); //1행 2열
pln("data: " + data);
//(2) 갯수
int rc = t.getRowCount();
int cc = t.getColumnCount();
pln("rc: " + rc + ", cc: " + cc);
//(3) 컬럼 이름
String cn = t.getColumnName(1);
pln("cn: " + cn);
}
void setUI() {
setTitle("JTable Test1");
setSize(300, 200);
setVisible(true);
setLocationRelativeTo(null);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
void pln(String str) {
System.out.println(str);
}
public static void main(String[] args) {
JT1 j = new JT1();
j.init();
}
}JTableCollection.java
package day08;
import java.awt.Container;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import java.util.*;
public class JT2 extends JFrame {
JTable t;
/*
Object[] columnNames = {"번호", "이름", "연락처", "날짜"};
Object rowData[][] = {
{"10", "홍길동", "01012341234", "20/12/18"},
{"20", "이순신", "01012341235", "20/12/18"},
{"30", "강감찬", "01012341236", "20/12/18"}
};*/
Vector<String> columnNames;
Vector<Vector> rowData;
JT2(){
columnNames = new Vector<String>();
columnNames.add("번호");
columnNames.add("이름");
columnNames.add("연락처");
columnNames.add("날짜");
rowData = new Vector<Vector>();
Vector<String> v1 = new Vector<String>();
v1.add("10"); v1.add("홍길동"); v1.add("01012341234"); v1.add("20/12/18");
Vector<String> v2 = new Vector<String>();
v2.add("20"); v2.add("이순신"); v2.add("01012341235"); v2.add("20/12/18");
Vector<String> v3 = new Vector<String>();
v3.add("30"); v3.add("강감찬"); v3.add("01012341236"); v3.add("20/12/18");
rowData.add(v1); rowData.add(v2); rowData.add(v3);
}
void init() {
Container cp = getContentPane();
t = new JTable(rowData, columnNames);
JScrollPane sp = new JScrollPane(t);
cp.add(sp);
test();
setUI();
}
void test() {
//(1) 임의의 데이터 ( get/set )
t.setValueAt("신촌", 1, 2);
Object data = t.getValueAt(1, 2); //1행 2열
pln("data: " + data);
//(2) 갯수
int rc = t.getRowCount();
int cc = t.getColumnCount();
pln("rc: " + rc + ", cc: " + cc);
//(3) 컬럼 이름
String cn = t.getColumnName(1);
pln("cn: " + cn);
}
void setUI() {
setTitle("JTable Test2");
setSize(300, 200);
setVisible(true);
setLocationRelativeTo(null);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
void pln(String str) {
System.out.println(str);
}
public static void main(String[] args) {
JT2 j = new JT2();
j.init();
}
}Author And Source
이 문제에 관하여(2020.12.18 일지), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다 https://velog.io/@peachy/study-045저자 귀속: 원작자 정보가 원작자 URL에 포함되어 있으며 저작권은 원작자 소유입니다.
우수한 개발자 콘텐츠 발견에 전념
(Collection and Share based on the CC Protocol.)
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