我正在尝试创建一个java程序,将特定表从一台服务器上的mysql数据库复制到另一台服务器上的mariadb。我知道有mysqldump,但是这个程序的目的是在不同的机器上运行,即使它们没有安装mysql。
我所创建的似乎工作得很好,因为生成的sql看起来确实正确,并且在使用heidisql连接mariadb时执行。但是当我使用 .executeQuery
,我得到一个错误作为我的sql有问题的响应。
代码基本上是:
import java.sql.*
public class JdbcTest {
Connection conn = null;
Connection conn_2 = null;
Statement stmt = null;
Statement stmt_2 = null;
//MySQL
Class.forName("com.mysql.cj.jdbc.Driver");
//MariaDB
Class.forName("org.mariadb.jdbc.Driver");
System.out.println("Connecting to DB1");
conn = DriverManager.getConnection(jdbc:mysql://server1/database,USER,PASS);
System.out.println("Connecting to DB2");
conn_2 = DriverManager.getConnection(jdbc:mariadb://server2/database,USER_2,PASS_2);
List<String> ConnToTableNames = new ArrayList<String>();
ConnToTableNames.add("table1");
ConnToTableNames.add("table2");
//Create queries for all tables in ConnToTableNames
stmt = conn.createStatement();
String exportSql = "";
for(String table : ConnToTableNames) {
//getting table structure
exportSql += "\n" +
"-- ----------------------------\n" +
"-- Table structure for `" + table+
"`\n-- ----------------------------\n"+
"DROP TABLE IF EXISTS `"+table+"`;\n";
ResultSet rs2 = stmt.executeQuery("SHOW CREATE TABLE `" + table + "`");
rs2.next();
exportSql += rs2.getString(2) + ";\n" +
"-- ----------------------------\n";
rs2.close();
//adding the content
ResultSet rss = stmt.executeQuery("select * from "+table);
while (rss.next()) {
int colCount = rss.getMetaData().getColumnCount();
if (colCount > 0) {
exportSql += "INSERT INTO `" + table +"` VALUES(";
for (int i = 0; i < colCount; i++) {
if (i > 0) {
exportSql += ",";
}
String s = "";
try {
s += "'";
s += rss.getObject(i + 1).toString();
s += "'";
} catch (Exception e) {
s = "NULL";
}
exportSql += s;
}
exportSql += ");\n";
}
}
rss.close();
}
//putting everything into the VM
stmt_2 = conn_2.createStatement();
stmt_2.executeQuery(exportSql);
stmt.close();
conn.close();
stmt_2.close();
conn_2.close();
}
我得到的错误是:
java.sql.SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'CREATE TABLE `supplier` (
`NUMMER` int(10) NOT NULL DEFAULT '0',
`PRIO` int(' at line 5
真正让我困惑的是:如果我抛弃 exportSql
到终端或文件,并通过heidisql执行它的工作。。。
我做错了什么?
提前谢谢,周末愉快
1条答案
按热度按时间x3naxklr1#
为了解决我的问题,我补充道
?allowMultiQueries=true
并使用execute()而不是executequery()。