import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.List;
public class testExportSql {
private static Connection conn=null;
private static Statement sm = null;
private static String schema="***";//数据库名
private static String select="SELECT * FROM";//查询sql
private static String insert="INSERT INTO";//插入sql
private static String values="VALUES";//values关键字
private static String []table={"***"};//table数组
private static List<String> insertList=new ArrayList<String>();//全局存放insertsql文件的数据
private static String filePath="E://insertSQL.txt";//绝对路径 导出数据的文件
private static String driver="com.mysql.jdbc.Driver";
private static String url="jdbc:mysql://123.16.10.456:3306";
private static String userName="root";
private static String password="root";
/**
* 导出数据库表
* @param args
* @throws SQLException
*/
public static void main(String[] args) throws SQLException {
List<String> listSQL=new ArrayList<String>();
connectSQL(driver, url, userName, password);//连接数据库
listSQL=createSQL();//创建查询语句
executeSQL(conn,sm,listSQL);//执行sql并拼装
createFile();//创建文件
}
/**
* 创建insertsql.txt并导出数据
*/
private static void createFile() {
File file=new File(filePath);
if(!file.exists()){
try {
file.createNewFile();
} catch (IOException e) {
System.out.println("创建文件名失败！！");
e.printStackTrace();
}
}
FileWriter fw=null;
BufferedWriter bw=null;
try {
fw = new FileWriter(file);
bw = new BufferedWriter(fw);
if(insertList.size()>0){
for(int i=0;i<insertList.size();i++){
bw.append(insertList.get(i));
bw.append("\n");
}
}
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
bw.close();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 拼装查询语句
* @return 返回select集合
*/
private static List<String> createSQL() {
List<String> listSQL=new ArrayList<String>();
for(int i=0;i<table.length;i++){
StringBuffer sb=new StringBuffer();
sb.append(select).append(" ").append(schema).append(".").append(table[i]);
listSQL.add(sb.toString());
}
return listSQL;
}
/**
* 连接数据库 创建statement对象
* @param driver
* @param url
* @param UserName
* @param Password
*/
public static void connectSQL(String driver,String url,String UserName,String Password){
try{
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url, UserName, Password);
sm=conn.createStatement();
}catch(Exception e){
e.printStackTrace();
}
}
/**
* 执行sql并返回插入sql
* @param conn
* @param sm
* @param listSQL
* @throws SQLException
*/
public static void executeSQL(Connection conn,Statement sm,List listSQL) throws SQLException{
List<String> insertSQL=new ArrayList<String>();
ResultSet rs=null;
try {
rs = getColumnNameAndColumeValue(sm, listSQL, rs);
} catch (SQLException e) {
e.printStackTrace();
}finally{
if(rs!=null){
rs.close();
}
sm.close();
conn.close();
}
}
/**
* 获取列名和列值
* @param sm
* @param listSQL
* @param rs
* @return
* @throws SQLException
*/
private static ResultSet getColumnNameAndColumeValue(Statement sm,
List listSQL, ResultSet rs) throws SQLException {
if(listSQL.size()>0){
for(int j=0;j<listSQL.size();j++){
String sql=String.valueOf(listSQL.get(j));
rs=sm.executeQuery(sql);
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
while(rs.next()){
StringBuffer ColumnName=new StringBuffer();
StringBuffer ColumnValue=new StringBuffer();
for(int i=1;i<=columnCount;i++){
if(rs.getString(i)!=null){
String value=rs.getString(i).trim();
if(i==1){
ColumnName.append(rsmd.getColumnName(i));
}else{
ColumnName.append(","+rsmd.getColumnName(i));
}
if(Types.CHAR == rsmd.getColumnType(i) || Types.VARCHAR == rsmd.getColumnType(i)
|| Types.LONGVARCHAR == rsmd.getColumnType(i)){
if(i==1){
ColumnValue.append("'").append(value).append("',");
}else if(i==columnCount){
ColumnValue.append("'").append(value).append("'");
}else{
ColumnValue.append("'").append(value).append("'").append(",");
}
}else if(Types.SMALLINT == rsmd.getColumnType(i) || Types.INTEGER == rsmd.getColumnType(i)
|| Types.BIGINT == rsmd.getColumnType(i) || Types.FLOAT == rsmd.getColumnType(i)
|| Types.DOUBLE == rsmd.getColumnType(i) || Types.NUMERIC == rsmd.getColumnType(i)
|| Types.DECIMAL == rsmd.getColumnType(i)){
if(i==1){
ColumnValue.append(value).append(",");
}else if(i==columnCount){
ColumnValue.append(value);
}else{
ColumnValue.append(value).append(",");
}
}else if(Types.DATE == rsmd.getColumnType(i) || Types.TIME == rsmd.getColumnType(i)
|| Types.TIMESTAMP == rsmd.getColumnType(i)){
if(i==1){
ColumnValue.append(value).append("',");
}else if(i==columnCount){
ColumnValue.append(value).append("'");
}else{
ColumnValue.append("'").append(value).append("'").append(",");
}
}else{
if(i!=columnCount){
ColumnValue.append(value).append(",");
}
}
}
}
System.out.println(ColumnName.toString());
System.out.println(ColumnValue.toString());
insertSQL(ColumnName, ColumnValue);
}
}
}
return rs;
}
/**
* 拼装insertsql 放到全局list里面
* @param ColumnName
* @param ColumnValue
*/
private static void insertSQL(StringBuffer ColumnName,
StringBuffer ColumnValue) {
for(int i=0;i<table.length;i++){
StringBuffer insertSQL=new StringBuffer();
insertSQL.append(insert).append(" ")
.append(table[i]).append("(").append(ColumnName.toString())
.append(")").append(values).append("(").append(ColumnValue.toString()).append(");");
insertList.add(insertSQL.toString());
System.out.println(insertSQL.toString());
}
}
}
Referencia: https://www.iteye.com/blog/jlwangjinshuang-163-com-2157199
Hay un pequeño problema en la publicación del blog de referencia, el código informa un error y el sql exportado no se puede insertar en la base de datos. Hice una corrección, pero el método principal es getColumnNameAndColumeValue, que también es muy bueno y vale la pena aprenderlo.