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lopespcmllopespcml
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3 files changed

+167
-14
lines changed

3 files changed

+167
-14
lines changed

‎join.sql

Lines changed: 32 additions & 0 deletions
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-- Active: 1690746463990@@127.0.0.1@5432@postgres
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drop table if exists palette_a;
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drop table if exists palette_b;
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CREATE TABLE palette_a (
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id INT PRIMARY KEY,
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color VARCHAR (100) NOT NULL
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);
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CREATE TABLE palette_b (
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id INT PRIMARY KEY,
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color VARCHAR (100) NOT NULL
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);
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INSERT INTO palette_a (id, color)
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VALUES (1, 'Red');
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INSERT INTO palette_a (id, color)
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VALUES (2, 'Green');
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INSERT INTO palette_a (id, color)
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VALUES (3, 'Blue');
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INSERT INTO palette_a (id, color)
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VALUES (4, 'Purple');
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-- insert data for the palette_b
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INSERT INTO palette_b (id, color)
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VALUES (1, 'Green');
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INSERT INTO palette_b (id, color)
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VALUES (2, 'Red');
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INSERT INTO palette_b (id, color)
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VALUES (3, 'Cyan');
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INSERT INTO palette_b (id, color)
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VALUES (4, 'Brown');

‎sefaz.sql

Lines changed: 54 additions & 0 deletions
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-- Active: 1690746463990@@127.0.0.1@5432@postgres
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drop table if exists Xvendedor;
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drop table if exists Xproduto;
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drop table if exists Xvendas;
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CREATE TABLE Xvendedor (
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nome VARCHAR (100) NOT NULL
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);
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CREATE TABLE Xproduto (
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tipo VARCHAR (100) NOT NULL,
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valor FLOAT
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);
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CREATE TABLE Xvendas (
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nome VARCHAR (100) NOT NULL,
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tipo VARCHAR (100) NOT NULL,
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quantidade INT
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);
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INSERT INTO Xvendedor (nome)
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VALUES ('Gabriela');
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INSERT INTO Xvendedor (nome)
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VALUES ('Joao');
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INSERT INTO Xvendedor (nome)
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VALUES ('Maria');
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INSERT INTO Xvendedor (nome)
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VALUES ('Pedro');
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INSERT INTO Xproduto (tipo, valor)
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VALUES ('Cadeira',800.0);
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INSERT INTO Xproduto (tipo, valor)
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VALUES ('Mesa',1400.0);
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INSERT INTO Xproduto (tipo, valor)
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VALUES ('Sofa',2600.0);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Gabriela','Cadeira',8);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Gabriela','Mesa',2);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Gabriela','Sofa',3);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Joao','Cadeira',4);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Joao','Mesa',1);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Joao','Sofa',3);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Maria','Cadeira',2);
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INSERT INTO Xvendas (nome,tipo, quantidade)
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VALUES ('Maria','Mesa',1);
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‎src/main/java/com/example/AppDB.java

Lines changed: 81 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -1,34 +1,101 @@
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package com.example;
22

3+
import java.sql.Connection;
34
import java.sql.DriverManager;
45
import java.sql.SQLException;
5-
import java.sql.Statement;
6+
67

78
public class AppDB {
8-
public static void main(String[] args) {
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private static final String PASSWORD = "";
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private static final String USERNAME = "gitpod";
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private static final String JDBC_URL = "jdbc:postgresql://localhost/postgres";
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13+
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public static void main(String[] args) {
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new AppDB();
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}
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public AppDB() {
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carregarDriver();
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try(var conn=getConnection()){
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/* listarEstados(conn);
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System.out.println();
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localizarEstado(conn, "TO");*/
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listasDados(conn,"marca");
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}
26+
catch(SQLException e) {
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System.out.println("Nao foi possivel connectar ao banco de dados!!!!" + e.getMessage());
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}
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}
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31+
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private void carregarDriver() {
933
try {Class.forName("org.postgresql.Driver");
1034
}
1135
catch (ClassNotFoundException e) {
1236
System.err.println("Nao foi possivel carregar o DB driver!!"+e.getMessage());
1337
}
14-
Statement statement=null;
15-
try(var conn=DriverManager.getConnection("jdbc:postgresql://localhost/postgres",
16-
"gitpod","")){
17-
System.out.println("Connexo com sucesso!!!!");
18-
statement = conn.createStatement();
19-
var result = statement.executeQuery("Select * fro estado");
38+
}
39+
40+
private Connection getConnection() throws SQLException {
41+
return DriverManager.getConnection(JDBC_URL,USERNAME,PASSWORD);
42+
}
43+
private void listarEstados(Connection conn) {
44+
try{
45+
// Statement query=null;
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var query = conn.createStatement();
47+
var sql = "Select * from estado";
48+
var result = query.executeQuery(sql);
2049
while (result.next()) {
21-
System.out.printf("ID: %d Nome : %s UF: %s\n",result.getInt("id"),result.getString("Nome"), result.getString("uf"));
50+
System.out.printf("ID: %d Nome : %s UF: %s\n",result.getInt("id"),result.getString("Nome"), result.getString("uf"));
2251
}
2352
}
2453
catch(SQLException e){
25-
if (statement==null) {
26-
System.out.println("Nao foi possivel connectar ao banco de dados!!!!");
54+
System.out.println("Erro no SQL:"+ e.getMessage());
55+
}
56+
}
57+
58+
private void localizarEstado(Connection conn,String uf) {
59+
try{
60+
// Statement query=null;
61+
// query = conn.createStatement();
62+
// var sql="Select * from estado where uf=" + "'"+uf+"'"; //SQL injection issue
63+
var sql= "Select * from estado where uf=?";
64+
var query =conn.prepareStatement(sql);
65+
query.setString(1,uf);
66+
var result = query.executeQuery();
67+
if (result.next()) {
68+
System.out.printf("ID: %d Nome : %s UF: %s\n",result.getInt("id"),result.getString("Nome"), result.getString("uf"));
2769
}
28-
else {
29-
System.out.println("Erro no SQL:"+ e.getMessage());
70+
}
71+
catch(SQLException e){
72+
System.out.println("Erro no SQL:"+ e.getMessage());
3073
}
31-
}
3274
}
75+
76+
private void listasDados(Connection conn, String tabela) {
77+
try{
78+
// Statement query=null;
79+
var query = conn.createStatement();
80+
var sql = "Select * from " + tabela;
81+
var result = query.executeQuery(sql);
82+
int cols=result.getMetaData().getColumnCount();
83+
for (int i = 1; i < cols; i++) {
84+
System.out.printf("%-25s",result.getMetaData().getColumnName(i));
85+
}
86+
System.out.println();
87+
88+
while (result.next()) {
89+
for (int i = 1; i < cols; i++) {
90+
System.out.printf("%-25s",result.getString(i));
91+
}
92+
System.out.println();
93+
}
94+
}
95+
catch(SQLException e){
96+
System.out.println("Erro no SQL:"+ e.getMessage());
97+
}
98+
}
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33100
}
34101

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