• ArthurSlog

• SLog-5

• Year·1

• Guangzhou·China

• July 11th 2018

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做到每個敲下的按鍵、每次鼠標的點擊、每次手機屏幕的觸碰，都能產生價值

開發環境MacOS(High Sierra 10.13.5)

Java為了開發應用級的程序，整個開發鏈比較繁瑣復雜，所以會需要更多的時間來掌握。

• 老規則，讓我們明確一下需要的信息Mysql官方手冊

• 打開命令行，測試一下java，如果提示沒有安裝JDK，移步JavaJDK下載

• 安裝完JDK，測試一下安裝是否完整

java -version

java version "10.0.1" 2018-04-17 Java(TM) SE Runtime Environment 18.3 (build 10.0.1+10) Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.1+10, mixed mode) 復制代碼

javac -version

javac 10.0.1 復制代碼

在macOS中，JDK安裝路徑是/Library/Java/JavaVirtualMachines/jdk-10.jdk/Contents/Home

在macOS中，JRE安裝路徑是/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

• 下載Connector / J，選擇platform Independent，選擇Platform Independent (Architecture Independent), ZIP Archive下載

• 下載好Connector / J后解壓文件得到文件夾，配置 CLASSPATH

export CLASSPATH=~/Downloads/mysql-connector-java-8.0.11.jar:$CLASSPATH

• 下面是完整代碼

LoadDriver.java

import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; import java.sql.ResultSet; import java.sql.ResultSetMetaData;// assume that conn is an already created JDBC connection (see previous examples) public class LoadDriver {public static void main(String[] args) {try {// The newInstance() call is a work around for some// broken Java implementationsClass.forName("com.mysql.cj.jdbc.Driver").newInstance();Connection conn = null;try {conn =DriverManager.getConnection("jdbc:mysql://localhost/my_db?" +"user=root&password=88888888");// Do something with the ConnectionStatement stmt = null;ResultSet rs = null;try {stmt = conn.createStatement();rs = stmt.executeQuery("SELECT * FROM Account");// or alternatively, if you don't know ahead of time that// the query will be a SELECT...if (stmt.execute("SELECT * FROM Account")) {rs = stmt.getResultSet();}// Now do something with the ResultSet ....ResultSetMetaData rsmd = rs.getMetaData();int columnsNumber = rsmd.getColumnCount();while (rs.next()) {for (int i = 1; i <= columnsNumber; i++) {if (i > 1) System.out.print(", ");String columnValue = rs.getString(i);System.out.print(columnValue + " " + rsmd.getColumnName(i));}System.out.println("");}}catch (SQLException ex){// handle any errorsSystem.out.println("SQLException: " + ex.getMessage());System.out.println("SQLState: " + ex.getSQLState());System.out.println("VendorError: " + ex.getErrorCode());}finally {// it is a good idea to release// resources in a finally{} block// in reverse-order of their creation// if they are no-longer neededif (rs != null) {try {rs.close();} catch (SQLException sqlEx) { } // ignorers = null;}if (stmt != null) {try {stmt.close();} catch (SQLException sqlEx) { } // ignorestmt = null;}}} catch (SQLException ex) {// handle any errorsSystem.out.println("SQLException: " + ex.getMessage());System.out.println("SQLState: " + ex.getSQLState());System.out.println("VendorError: " + ex.getErrorCode());}} catch (Exception ex) {// handle the errorSystem.out.println("Exception: " + ex.getMessage());}} } 復制代碼

執行流程如下：

用java應用程序注冊你的mysql jdbc驅動程序，參考Mysql/JDBC執行SQL手冊

Class.forName("com.mysql.cj.jdbc.Driver").newInstance() 復制代碼

連接數據庫

conn =DriverManager.getConnection("jdbc:mysql://localhost/my_db?" + "user=root&password=88888888") 復制代碼

獲得連接對象，并執行SQL指令

Statement stmt = null; ResultSet rs = null;stmt = conn.createStatement(); rs = stmt.executeQuery("SELECT * FROM Account"); 復制代碼

獲得SQL執行結果，對結果進行打印

ResultSetMetaData rsmd = rs.getMetaData(); int columnsNumber = rsmd.getColumnCount(); while (rs.next()) {for (int i = 1; i <= columnsNumber; i++) {if (i > 1) System.out.print(", ");String columnValue = rs.getString(i);System.out.print(columnValue + " " + rsmd.getColumnName(i));}System.out.println("");} 復制代碼

• 打印SQL結果

ResultSet resultSet = statement.executeQuery("SELECT * from foo"); ResultSetMetaData rsmd = resultSet.getMetaData(); int columnsNumber = rsmd.getColumnCount(); while (resultSet.next()) {for (int i = 1; i <= columnsNumber; i++) {if (i > 1) System.out.print(", ");String columnValue = resultSet.getString(i);System.out.print(columnValue + " " + rsmd.getColumnName(i));}System.out.println(""); } 復制代碼

• 切換到LoadDriver.java文件路徑下，編譯LoadDriver.java文件

javac LoadDriver.java

• 編譯生成LoadDriver.class,編譯提示

注: LoadDriver.java使用或覆蓋了已過時的 API。 注: 有關詳細信息, 請使用 -Xlint:deprecation 重新編譯。 復制代碼

• 執行LoadDriver.class文件

java LoadDriver

• 執行結果，打印Account表信息如下：

1 ID, ArthurSlog AccountName, ArthurSlog Password 復制代碼

• 至此，Java與MySQL成功實現了數據交互。

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