initial commit

Author: jbrun0r

.classpath

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.USER_LIBRARY/MySQLConnector">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

.gitignore

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+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*

.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>Java-DAO-JDBC</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

.settings/org.eclipse.jdt.core.prefs

@@ -0,0 +1,14 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=11
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=11
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=11

db.properties

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+user=root
+password=******
+dburl=jdbc:mysql://localhost:3306/jdbc
+useSSL=false

src/db/DB.java

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+package db;
+
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.Properties;
+
+public class DB {
+
+	private static Connection conn = null;
+
+	public static Connection getConnection() {
+		if (conn == null) {
+			try {
+				Properties props = loadProperties();
+				String url = props.getProperty("dburl");
+				conn = DriverManager.getConnection(url, props);
+			} catch (SQLException e) {
+				throw new DbException(e.getMessage());
+			}
+
+		}
+		return conn;
+	}
+
+	public static void closeConnection() {
+		if (conn != null) {
+			try {
+				conn.close();
+			} catch (SQLException e) {
+				throw new DbException(e.getMessage());
+			}
+
+		}
+	}
+
+	private static Properties loadProperties() {
+		try (FileInputStream fs = new FileInputStream("db.properties")) {
+			Properties props = new Properties();
+			props.load(fs);
+			return props;
+		} catch (IOException e) {
+			throw new DbException(e.getMessage());
+		}
+	}
+	
+	public static void closeStatement(Statement st) {
+		if(st!=null) {
+			try {
+				st.close();
+			} catch (SQLException e) {
+				throw new DbException(e.getMessage());
+			}
+		}
+	}
+	
+	public static void closeResultSet(ResultSet rs) {
+		if(rs!=null) {
+			try {
+				rs.close();
+			} catch (SQLException e) {
+				throw new DbException(e.getMessage());
+			}
+		}
+	}
+}

src/db/DbException.java

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+package db;
+
+public class DbException extends RuntimeException{
+	private static final long serialVersionUID = 1L;
+	
+	public DbException(String msg) {
+		super(msg);
+	}
+}

src/db/DbIntegrityException.java

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+package db;
+
+public class DbIntegrityException extends RuntimeException {
+	private static final long serialVersionUID = 1L;
+	
+	public DbIntegrityException(String msg) {
+		 super(msg);
+	}
+}