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| <?xml version="1.0" encoding="UTF-8"?> | ||
| <project xmlns="http://maven.apache.org/POM/4.0.0" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 | ||
| http://maven.apache.org/xsd/maven-4.0.0.xsd"> | ||
| <modelVersion>4.0.0</modelVersion> | ||
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| <groupId>github.donsez.bd</groupId> | ||
| <artifactId>jdbc-postgresql</artifactId> | ||
| <version>0.1.0-SNAPSHOT</version> | ||
| <name>postgresql</name> | ||
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| <properties> | ||
| <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> | ||
| <maven.compiler.source>1.8</maven.compiler.source> | ||
| <maven.compiler.target>1.8</maven.compiler.target> | ||
| <postgresql.version>42.7.1</postgresql.version> | ||
| <!-- Remark : This Postgres JDBC Driver had vulnerabilities --> | ||
| </properties> | ||
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| <dependencies> | ||
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| <dependency> | ||
| <groupId>org.postgresql</groupId> | ||
| <artifactId>postgresql</artifactId> | ||
| <version>${postgresql.version}</version> | ||
| </dependency> | ||
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| </dependencies> | ||
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| <build> | ||
| <plugins> | ||
| <plugin> | ||
| <artifactId>maven-compiler-plugin</artifactId> | ||
| <version>3.8.0</version> | ||
| <configuration> | ||
| <source>1.8</source> | ||
| <target>1.8</target> | ||
| </configuration> | ||
| </plugin> | ||
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| </plugins> | ||
| </build> | ||
| </project> |
39 changes: 39 additions & 0 deletions
39
jdbc-postgresql/src/main/java/com/mkyong/jdbc/ConnectOnlyExample.java
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| package com.mkyong.jdbc; | ||
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| import java.sql.Connection; | ||
| import java.sql.DriverManager; | ||
| import java.sql.SQLException; | ||
| import java.util.Properties; | ||
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| public class ConnectOnlyExample { | ||
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| public static void main(String[] args) { | ||
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| // https://docs.oracle.com/javase/8/docs/api/java/sql/package-summary.html#package.description | ||
| // auto java.sql.Driver discovery -- no longer need to load a java.sql.Driver class via Class.forName | ||
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| // register JDBC driver, optional since java 1.6 | ||
| /*try { | ||
| Class.forName("org.postgresql.Driver"); | ||
| } catch (ClassNotFoundException e) { | ||
| e.printStackTrace(); | ||
| }*/ | ||
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| // auto close connection | ||
| try (Connection conn = DriverManager.getConnection( | ||
| "jdbc:postgresql://127.0.0.1:5432/test", "postgres", "changeme")) { | ||
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| if (conn != null) { | ||
| System.out.println("Connected to the database!"); | ||
| } else { | ||
| System.out.println("Failed to make connection!"); | ||
| } | ||
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| } catch (SQLException e) { | ||
| System.err.format("SQL State: %s\n%s", e.getSQLState(), e.getMessage()); | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| } | ||
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| } | ||
| } |
60 changes: 60 additions & 0 deletions
60
jdbc-postgresql/src/main/java/com/mkyong/jdbc/ListEmployeeExample.java
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| @@ -0,0 +1,60 @@ | ||
| package com.mkyong.jdbc; | ||
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| import com.mkyong.jdbc.model.Employee; | ||
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| import java.math.BigDecimal; | ||
| import java.sql.*; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
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| public class ListEmployeeExample { | ||
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| public static void main(String[] args) { | ||
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| System.out.println("PostgreSQL JDBC Connection Testing ~"); | ||
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| // https://docs.oracle.com/javase/8/docs/api/java/sql/package-summary.html#package.description | ||
| // auto java.sql.Driver discovery -- no longer need to load a java.sql.Driver class via Class.forName | ||
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| // register JDBC driver, optional since java 1.6 | ||
| // Class.forName("org.postgresql.Driver"); | ||
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| List<Employee> result = new ArrayList<>(); | ||
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| String SQL_SELECT = "Select * from EMPLOYEE"; | ||
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| // auto close connection and preparedStatement | ||
| try (Connection conn = DriverManager.getConnection( | ||
| "jdbc:postgresql://127.0.0.1:5432/test", "postgres", "changeme"); | ||
| PreparedStatement preparedStatement = conn.prepareStatement(SQL_SELECT)) { | ||
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| ResultSet resultSet = preparedStatement.executeQuery(); | ||
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| while (resultSet.next()) { | ||
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| long id = resultSet.getLong("ID"); | ||
| String name = resultSet.getString("NAME"); | ||
| BigDecimal salary = resultSet.getBigDecimal("SALARY"); | ||
| Timestamp createdDate = resultSet.getTimestamp("CREATED_DATE"); | ||
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| Employee obj = new Employee(); | ||
| obj.setId(id); | ||
| obj.setName(name); | ||
| obj.setSalary(salary); | ||
| // Timestamp -> LocalDateTime | ||
| obj.setCreatedDate(createdDate.toLocalDateTime()); | ||
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| result.add(obj); | ||
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| } | ||
| result.forEach(x -> System.out.println(x)); | ||
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| } catch (SQLException e) { | ||
| System.err.format("SQL State: %s\n%s", e.getSQLState(), e.getMessage()); | ||
| } catch (Exception e) { | ||
| e.printStackTrace(); | ||
| } | ||
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| } | ||
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| } |
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