Oracle读取库中表结构代码,Java代码库,德仔网

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【Java】 Oracle读取库中表结构
作者:码农 / 发布于2017/3/29/ 892
1. 方法如下
public List<Table> export() {
        List<Table> tableList = new ArrayList<Table>();
        
            Connection conn = DBUtil.getConnection();
            ResultSet tableRs = null; // 存库元数据
            ResultSet colRs = null;//存储表元数据
        try {

            DatabaseMetaData dbmd = conn.getMetaData();//返回连接到的数据库此 Connection 对象所连接的数据库的元数据

            //获取所有表
            List<String> tableNameList = new ArrayList<String>();
            tableRs = dbmd.getTables(null, "%", "%", new String[]{"TABLE"}); //所有表
            while (tableRs.next()) {
                String tableName = tableRs.getString("TABLE_NAME");//表名
                tableNameList.add(tableName);
            }

            List<Field> fieldList = null;//存储每一个表的所有字段
            Table table = null;
            for (String name : tableNameList ) {
                table = new Table();
                //获取表的字段
                colRs = dbmd.getColumns(null, "%", name, "%");//当前表的字段
                Field field = null;
                fieldList = new ArrayList<Field>();
                while (colRs.next()) {
                    field = new Field();
                    String columnName = colRs.getString("COLUMN_NAME");//名称
                    String columnType = colRs.getString("TYPE_NAME");//类型
                    int datasize = colRs.getInt("COLUMN_SIZE");//字段长度
                    int digits = colRs.getInt("DECIMAL_DIGITS");
                    int nullable = colRs.getInt("NULLABLE");//返回1就表示可以是Null,而0就表示Not Null
                    field.setColumnName(columnName);
                    field.setTypeName(columnType);
                    field.setColumnSize(datasize);
                    field.setDecimal_digits(digits);
                    field.setNullable(nullable);

                    fieldList.add(field);
                }
                table.setTableName(name);
                table.setField(fieldList);
                tableList.add(table);
            }
        } catch (SQLException ex) {
            Logger.getLogger(ExportOracleTable.class.getName()).log(Level.SEVERE, null, ex);
        } finally {
            if(colRs != null) {
                try {
                    colRs.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ExportOracleTable.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(tableRs != null) {
                try {
                    tableRs.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ExportOracleTable.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
            if(conn != null) {
                try {
                    conn.close();
                } catch (SQLException ex) {
                    Logger.getLogger(ExportOracleTable.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }
        return tableList;
    }
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