1,根据数据库类型拼接不同URL
/**
* 根据类型不同拼接连接的URL
* @param dbType 1：mysql、2：oracle、3：sql server、4：gp
* @param ip
* @param port
* @param databaseName
* @return*/
public static String getTestDbUrl(int dbType, String ip, String port, String databaseName){
String url = "";
if (Constant.DATABASE_TYPE_MYSQL == dbType){
//mysql
url = "jdbc:mysql://"+ip+":"+port+"/"+databaseName+"?useUnicode=true&characterEncoding=UTF8";
}else if (Constant.DATABASE_TYPE_ORACLE == dbType){
//oracle
url = "jdbc:oracle:thin:@"+ip+":"+port+":ORCL";
}else if (Constant.DATABASE_TYPE_SQL_SERVER == dbType){
//sql server
url = "jdbc:sqlserver://"+ip+":"+port+";databaseName="+databaseName+";integratedSecurity=true";
}else if (Constant.DATABASE_TYPE_GP == dbType){
//gp
url = "jdbc:postgresql://"+ip+":"+port+"/"+databaseName;
}
return url;
}
2,创建连接并查询
/**
* 通过jsbc获取数据
* @param driver driver
* @param url 数据库url
* @param username 用户名
* @param password 密码
* @param sql sql语句
* @param sqlType 语句类型 ，1：查询语句，2：创建语句
* @param columnConnt 查询语句返回列的个数
* @return List
*/
public static List<Map<String, String>> getJdbcData(String driver, String url, String username, String password, String sql, int sqlType, int columnConnt){
Connection con = null;
Statement st = null;
ResultSet rs = null;
List<Map<String, String>> result = new ArrayList<>();
try {
//1.加载oracle数据库驱动
Class.forName(driver);
//2.获取数据库连接
con = DriverManager.getConnection(url, username, password);
//3.获取执行sql语句的平台
st = con.createStatement();
//4.执行sql语句获取结果集
// 查询
if(sqlType == 1){
rs = st.executeQuery(sql);
//5.循环获取结果集数据
int i = 1;
while(rs.next()){
if(i <= columnConnt){
Map<String, String> resultMap = new HashMap<>(columnConnt);
for (int j = 0; j < columnConnt; j++) {
resultMap.put("column" + (j + 1) + "", rs.getString(j + 1));
}
result.add(resultMap);
}
}
}else{
// 创建
int rss = st.executeUpdate(sql);
Map<String, String> resultMap = new HashMap<>(columnConnt);
resultMap.put("column" + 1 + "", rss + "");
result.add(resultMap);
}
return result;
} catch (ClassNotFoundException e) {
e.printStackTrace();
Map<String, String> resultMap = new HashMap<>(columnConnt);
resultMap.put("column1", "-1");
result.add(resultMap);
} catch (SQLException e) {
e.printStackTrace();
Map<String, String> resultMap = new HashMap<>(columnConnt);
resultMap.put("column1", "-1");
result.add(resultMap);
}finally{
//关闭rs
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
//关闭st
if(st != null){
try {
st.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
//关闭con
if(con != null){
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return result;
}
// return result;
}
3,设置参数
/**
* 查询指定数据库中指定表的字段信息
* @param databaseType 数据库类型: 1：mysql、2：oracle、3：sql server、4：gp
* @param databaseName 数据库名称
* @param databaseIp 数据库ip
* @param databasePort 数据库端口
* @param databaseUserName 数据库用户名
* @param databaseUserPassword 数据库用户的密码
* @param tableName 表名
* @return*/
public static List<Map<String, String>> getColumnInfoByTableName(int databaseType, String databaseName, String databaseIp, String databasePort, String databaseUserName,
String databaseUserPassword, String tableName){
String sql = "";
if (Constant.DATABASE_TYPE_MYSQL == databaseType){
//mysql
sql = "SELECT column_name, data_type,(case when data_type = 'int' or data_type = 'float' or data_type = 'double' or data_type = 'decimal' then NUMERIC_PRECISION else CHARACTER_MAXIMUM_LENGTH end ) as data_length,\n" +
"(case when IS_NULLABLE = 'NO' then 0 else 1 end)as data_Null,(case when COLUMN_KEY='PRI' then 1 else 0 end) as data_IsPK\n" +
" FROM information_schema.COLUMNS WHERE table_schema = '"+databaseName+"' and table_name = '"+tableName+"'";
}else if (Constant.DATABASE_TYPE_ORACLE == databaseType){
//oracle
sql = "SELECT column_name, data_type, data_length, NULLABLE,(case when column_name=(select col.column_name \n" +
"from user_constraints con, user_cons_columns col \n" +
"where con.constraint_name = col.constraint_name \n" +
"and con.constraint_type='P' \n" +
"and col.table_name = "+tableName+"\n" +
") then 1 else 0 end) as IsPK\n" +
" FROM all_tab_cols\n" +
" WHERE table_name = '"+tableName+"' ";
}else if (Constant.DATABASE_TYPE_SQL_SERVER == databaseType){
//sql server
sql = "SELECT C.name as column_name, T.name as data_type, COLUMNPROPERTY(C.id,C.name,'PRECISION') as data_length, \n" +
"convert(bit,case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=c.id and name in (\n" +
" SELECT name FROM sysindexes WHERE indid in(\n" +
" SELECT indid FROM sysindexkeys WHERE id = c.id AND colid=c.colid))) then 1 else 0 end) \n" +
" as data_IsPK, convert(bit,C.IsNullable) as data_Null\n" +
"FROM syscolumns C INNER JOIN systypes T ON C.xusertype = T.xusertype \n" +
"inner join sysobjects d on a.id=d.id and d.xtype='U' and d.name<>'dtproperties' \n" +
"where T.name is not null\n" +
"and d.name='"+tableName+"'";
}else if (Constant.DATABASE_TYPE_GP == databaseType){
//gp }
List<Map<String, String>> columnNameList = JdbcUtil.getJdbcData(SingletonHoldResource.getInstance().getDictMap(Constant.DB_DRIVER).get(Integer.toString(databaseType)),
getTestDbUrl(databaseType, databaseIp, databasePort, databaseName),
databaseUserName, databaseUserPassword,
sql,
1, 5);
//结果中的对应关系:column1 -- name; column2 -- type; column3 -- length; column4 -- IsNull; column5 -- isPk;
return columnNameList;
}