blocks|key|564801|text|数据库在jdbc连接中不是必需的，所以您可以在http://forums.mysql.com/read.php?39,99321,102211#msg-102211和http://marc.info/?l=mysql-java&m=104508605511590&w=2上执行类似推荐的操作|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|564802|Conn+=+DriverManager.getConnection
("jdbc:mysql://localhost/?user=root&password=rootpassword");+
s=Conn.createStatement();
int+Result=s.executeUpdate("CREATE+DATABASE+databasename");|code-block|syntax|javascript|564803|entityMap|0|LINK|mutability|MUTABLE|url|http://forums.mysql.com/read.php?39,99321,102211#msg-102211|1|http://marc.info/?l=mysql-java&m=104508605511590&w=2^0|N|1N|0|2B|1G|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

The database isn't required in the jdbc connection, so you can do something like recommended at <a href="http://forums.mysql.com/read.php?39,99321,102211#msg-102211" rel="noreferrer">http://forums.mysql.com/read.php?39,99321,102211#msg-102211</a> and <a href="http://marc.info/?l=mysql-java&amp;m=104508605511590&amp;w=2" rel="noreferrer">http://marc.info/?l=mysql-java&amp;m=104508605511590&amp;w=2</a>:

<pre><code>Conn = DriverManager.getConnection
("jdbc:mysql://localhost/?user=root&amp;password=rootpassword"); 
s=Conn.createStatement();
int Result=s.executeUpdate("CREATE DATABASE databasename");
</code></pre>

blocks|key|1149226|text|要通过Java代码创建数据库，必须使用executeUpdate(sql)而不是executeQuery(sql);，并以根用户身份连接到mysql数据库：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1149227|connection+=++DriverManager.getConnection(
++++"jdbc:mysql://localhost:3306/mysql?zeroDateTimeBehavior=convertToNull",
++++"root",+"root"
);
Statement+st+=+connection.createStatement();
st.executeUpdate(sql);
st.close();|code-block|syntax|javascript|1149228|entityMap^0|J|I|14|I|1X|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|L|$]]

To create database through Java code, you must use <code>executeUpdate(sql)</code> instead of <code>executeQuery(sql);</code> and connect to the <code>mysql</code> database as root:

<pre><code>connection = DriverManager.getConnection(
 "jdbc:mysql://localhost:3306/mysql?zeroDateTimeBehavior=convertToNull",
 "root", "root"
);
Statement st = connection.createStatement();
st.executeUpdate(sql);
st.close();
</code></pre>

blocks|key|3785588|text|解决这类问题的一种优雅方法是使用Apache中的DDL+Utils。它不仅服务于允许执行(外部可配置的)DDL的基本目的，还将使您的应用程序数据库独立。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3785589|entityMap|0|LINK|mutability|MUTABLE|url|http://db.apache.org/ddlutils/^0|O|9|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

An elegant approach to such issues is using <a href="http://db.apache.org/ddlutils/" rel="nofollow noreferrer">DDL Utils</a> from Apache. Not only would it serve the basic purpose of allowing to execute your (externally configurable) DDLs, but also would make your application database independent.

blocks|key|565151|text|为了让事情变得更简单，你可以使用SQL6.5，它使得设置NetBeans数据库变得如此容易。我现在正在使用它们，它是GUI布局和数据库连接的救命稻草。下面是我如何从NetBeans连接到mysql数据库的一些代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|565152|++++//these+are+variables+i+declare+in+the+beginning+of+my+code
++++public+static+final+String+DRIVER+=+"com.mysql.jdbc.Driver";
++++public+static+final+String+DATABASE_URL+=+"jdbc:mysql://localhost:3306/jtschema";
++++private+Connection+connection+=+null;
++++public+static+Statement+statement+=+null;

++++public+void+initSQLServer()+{
++++++++try+{
++++++++++++Class.forName(DRIVER).newInstance();
++++++++++++try+{
++++++++++++++++connection+=+DriverManager.getConnection(DATABASE_URL,+"root",+"Dropatrain!248");
++++++++++++++++statement+=+connection.createStatement();
++++++++++++}+catch+(SQLException+e)+{
++++++++++++++++System.out.println("SQLException:+"+%2B+e.getMessage());
++++++++++++++++System.out.println("SQLState:+"+%2B+e.getSQLState());
++++++++++++++++System.out.println("VendorError:+"+%2B+e.getErrorCode());
++++++++++++}
++++++++}+catch+(Exception+ex)+{
++++++++++++System.out.println(ex);
++++++++}
++++}|code-block|syntax|javascript|565153|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

To make things even easier, you can use NetBeans 6.5 and it makes setting up SQL databases SO much easier. I'm using them right now and its a lifesaver on GUI layouts and database connections. Here's some code on how I connect to mysql database from NetBeans:

<pre><code> //these are variables i declare in the beginning of my code
 public static final String DRIVER = "com.mysql.jdbc.Driver";
 public static final String DATABASE_URL = "jdbc:mysql://localhost:3306/jtschema";
 private Connection connection = null;
 public static Statement statement = null;

 public void initSQLServer() {
 try {
 Class.forName(DRIVER).newInstance();
 try {
 connection = DriverManager.getConnection(DATABASE_URL, "root", "Dropatrain!248");
 statement = connection.createStatement();
 } catch (SQLException e) {
 System.out.println("SQLException: " + e.getMessage());
 System.out.println("SQLState: " + e.getSQLState());
 System.out.println("VendorError: " + e.getErrorCode());
 }
 } catch (Exception ex) {
 System.out.println(ex);
 }
 }
</code></pre>

blocks|key|565229|text|您可以使用以下代码行：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|565230|++++try+{
++++++++String+databaseName+=+"dbName";
++++++++String+userName+=+"root";
++++++++String+password+=+"yourPassword";

++++++++String+url+=+"jdbc:mysql://localhost:3306/mysql?zeroDateTimeBehavior=convertToNull";
++++++++Connection+connection+=+DriverManager.getConnection(url,username,+password);

++++++++String+sql+=+"CREATE+DATABASE+"+%2B+databaseName;

++++++++Statement+statement+=+connection.createStatement();
++++++++statement.executeUpdate(sql);
++++++++statement.close();
++++++++JOptionPane.showMessageDialog(null,+databaseName+%2B+"+Database+has+been+created+successfully",+"System+Message",+JOptionPane.INFORMATION_MESSAGE);

++++}+catch+(Exception+e)+{
++++++++e.printStackTrace();
}|code-block|syntax|javascript|565231|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use this lines:

<pre><code> try {
 String databaseName = "dbName";
 String userName = "root";
 String password = "yourPassword";

 String url = "jdbc:mysql://localhost:3306/mysql?zeroDateTimeBehavior=convertToNull";
 Connection connection = DriverManager.getConnection(url,username, password);

 String sql = "CREATE DATABASE " + databaseName;

 Statement statement = connection.createStatement();
 statement.executeUpdate(sql);
 statement.close();
 JOptionPane.showMessageDialog(null, databaseName + " Database has been created successfully", "System Message", JOptionPane.INFORMATION_MESSAGE);

 } catch (Exception e) {
 e.printStackTrace();
}
</code></pre>

Is it possible to create a MySQL database from Java?

I have only seen connection URLs examples like this where the database name is specified in the URL: 

<pre><code>String url="jdbc:mysql://localhost:3306/test";

Connection con = DriverManager.getConnection( url, "cb0", "xxx" );
</code></pre>

How can I create a MySQL database when I only have a login name and password?

Create MySQL database from Java

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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可以从Java创建一个MySQL数据库吗？我只见过这样的连接URL示例，其中数据库名称在URL中指定：String url="jdbc:mysql://localhost:3306/test";Connection con = DriverManager.getConnection( url, "cb0", "xxx" );只有登录名和密码时，如何创建MySQL数据库？

问从Java创建MySQL数据库
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