Java 将转储文件导入mysql JDBC
我正在使用Java和MySQL（JDBC），我想将转储文件导入数据库。正确的方法是什么？ 我尝试了以下代码：Java 将转储文件导入mysql JDBC,java,mysql,jdbc,mysqlimport,Java,Mysql,Jdbc,Mysqlimport,我正在使用Java和MySQL（JDBC），我想将转储文件导入数据库。正确的方法是什么？ 我尝试了以下代码： // function "connectToDB" connects to the Database, and not the server. // variable sourcePath refers to the dumpfile. Connection con = connectToDB(USERNAME, PASSWORD); String q = "sourc
// function "connectToDB" connects to the Database, and not the server.
// variable sourcePath refers to the dumpfile.
Connection con = connectToDB(USERNAME, PASSWORD);
String q = "source " + sourcePath;
System.out.println("Q is: " + q);
try {
Statement statement = con.createStatement();
statement.executeUpdate(q);
} catch (Exception ex) {
ex.printStackTrace();
}
closeConnection(con);
由于它列在错误SQL语句中，所以您正在尝试执行下面的查询
source C:...\Desktop\dumpfile.sql
q
由于它列在错误SQL语句中，所以您正在尝试执行下面的查询
source C:...\Desktop\dumpfile.sql
q
您需要分别运行每个语句并删除注释
- 以空命令字符串开始
- 读每一行
- 修剪线
- 丢弃以--
- 将行添加到命令字符串中
- 如果行以结束；运行命令并重复步骤1
- 以空命令字符串开始
- 读每一行
- 修剪线
- 丢弃以--
- 将行添加到命令字符串中
- 如果行以结束；运行命令并重复步骤1
- 感谢大家的帮助，阅读了他们的想法，我终于导入了dumpfile.sql
因此，如果有人有同样的问题，我的示例代码如下：
Connection con = connectToDB(USERNAME, PASSWORD);
/* Note that con is a connection to database, and not the server.
if You have a connection to the server, the first command in the dumpfile should be the
USE db_name; */
String q = "";
File f = new File(sourcePath); // source path is the absolute path of dumpfile.
try {
BufferedReader bf = new BufferedReader(new FileReader(f));
String line = null;
line = bf.readLine();
while (line != null) {
q = q + line + "\n";
line = bf.readLine();
}
} catch (Exception ex) {
ex.printStackTrace();
}
// Now we have the content of the dumpfile in 'q'.
// We must separate the queries, so they can be executed. And Java Simply does this:
String[] commands = q.split(";");
try {
Statement statement = con.createStatement();
for (String s : commands) {
statement.execute(s);
}
} catch (Exception ex) {
}
closeConnection(con);
private Connection connectToDB(String username, String password) {
try {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/" + DATABASE;
Properties objProperties = new Properties();
objProperties.put("user", username);
objProperties.put("password", password);
objProperties.put("useUnicode", "true");
objProperties.put("characterEncoding", "utf-8");
Connection con = DriverManager.getConnection(url, objProperties);
return con;
} catch (Exception ex) {
System.out.println("Connection to sql database failed.");
ex.printStackTrace();
return null;
}
}
感谢大家的帮助，阅读他们的想法，我终于导入了dumpfile.sql 因此，如果有人有同样的问题，我的示例代码如下：
Connection con = connectToDB(USERNAME, PASSWORD);
/* Note that con is a connection to database, and not the server.
if You have a connection to the server, the first command in the dumpfile should be the
USE db_name; */
String q = "";
File f = new File(sourcePath); // source path is the absolute path of dumpfile.
try {
BufferedReader bf = new BufferedReader(new FileReader(f));
String line = null;
line = bf.readLine();
while (line != null) {
q = q + line + "\n";
line = bf.readLine();
}
} catch (Exception ex) {
ex.printStackTrace();
}
// Now we have the content of the dumpfile in 'q'.
// We must separate the queries, so they can be executed. And Java Simply does this:
String[] commands = q.split(";");
try {
Statement statement = con.createStatement();
for (String s : commands) {
statement.execute(s);
}
} catch (Exception ex) {
}
closeConnection(con);
private Connection connectToDB(String username, String password) {
try {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/" + DATABASE;
Properties objProperties = new Properties();
objProperties.put("user", username);
objProperties.put("password", password);
objProperties.put("useUnicode", "true");
objProperties.put("characterEncoding", "utf-8");
Connection con = DriverManager.getConnection(url, objProperties);
return con;
} catch (Exception ex) {
System.out.println("Connection to sql database failed.");
ex.printStackTrace();
return null;
}
}
我实际上使用了@Makan Tayebi自己的答案，但我觉得可以做一些改进。 如果转储文件大小过大，则可能会出现第一个问题，而这种方法不是最佳的。 如果表中的数据包含特殊字符“；”，则可能出现第二个问题对于数据，在“”内拆分上读取的文件字符串；在这个问题上也会有分歧,；例外情况将会发生。 现在，这是我的解决方案。刚刚编辑了他的：
Connection con = connectToDB(USERNAME, PASSWORD);
/* Note that con is a connection to database, and not the server.
if You have a connection to the server, the first command in the dumpfile should be the
USE db_name; */
//String q = "";
try {
File f = new File(path); // source path is the absolute path of dumpfile.
BufferedReader bf = new BufferedReader(new FileReader(f));
String line = null,old="";
line = bf.readLine();
while (line != null) {
//q = q + line + "\n";
if(line.endsWith(";")){
stmt.executeUpdate(old+line);
old="";
}
else
old=old+"\n"+line;
line = bf.readLine();
}
} catch (Exception ex) {
ex.printStackTrace();
}
closeConnection(con);
这段代码假设sql转储是使用mysqldump或任何其他在每条语句结束后换行的程序创建的。我实际上使用了@Makan Tayebi自己的答案，但我觉得可以做一些改进。 如果转储文件大小过大，则可能会出现第一个问题，而这种方法不是最佳的。 如果表中的数据包含特殊字符“；”，则可能出现第二个问题对于数据，在“”内拆分上读取的文件字符串；在这个问题上也会有分歧,；例外情况将会发生。 现在，这是我的解决方案。刚刚编辑了他的：
Connection con = connectToDB(USERNAME, PASSWORD);
/* Note that con is a connection to database, and not the server.
if You have a connection to the server, the first command in the dumpfile should be the
USE db_name; */
//String q = "";
try {
File f = new File(path); // source path is the absolute path of dumpfile.
BufferedReader bf = new BufferedReader(new FileReader(f));
String line = null,old="";
line = bf.readLine();
while (line != null) {
//q = q + line + "\n";
if(line.endsWith(";")){
stmt.executeUpdate(old+line);
old="";
}
else
old=old+"\n"+line;
line = bf.readLine();
}
} catch (Exception ex) {
ex.printStackTrace();
}
closeConnection(con);
此代码假定sql转储是使用mysqldump或任何其他在每个语句结束后换行的程序创建的。将executeUpdate更改为executeQuery，并查看它是否工作否我刚刚测试了“executeQuery”和“execute”但是他们都给了我一个完全相同的错误。如果您使用
mysqldumpmysqlimportmysqldumpmysqlimport