public int findColumn(java.lang.String columnName) 參數 columnName String,包含資料行的名稱。 傳回值 指出資料行索引的 int。 例外狀況 SQLServerException 備註 這個findColumn 方法是由 java.sql.ResultSet 介面中的 findColumn 方法指定。 如果有多個資料行同名,findColumn 方法會傳回第一個區分大小寫的相符...
在一次表迁移测试中,我遇到了如下异常: Java.sql.SQLException,关闭的ResultSet;findColumn,at oracle.jdbc.driver.InsentiveScrollableResultSet.ensureOpen... 这个异常字面意思是Resultset已经关闭了...其结果是数据写入目标数据库出错,迁移失败。 但我清楚程序里是一定是没有在读取结束前就关闭连接而导致ResultSet提前...
T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STATEMENT ADD COLUMN to variable table? Add prefix in data column Add Time in SQL HH:MM:SS to another HH:MM:SS Adding a column to a large (100 million rows) table with default constraint adding a extra column in...
IDatabaseMetaData IDriver IDriverExtensions INClob IParameterMetaData IPreparedStatement IRef IResultSet IResultSet 字段 属性 方法 Absolute AfterLast BeforeFirst CancelRowUpdates ClearWarnings Close DeleteRow FindColumn First GetArray GetAsciiStream
例如,我要查看INVOICE数据库的大小,那么可以通过下面SQL查看 mysql> use information_schema Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Database changed mysql> select concat(round(sum(data_length)/(1024*1024),2...
You want to find records with NULL in a column. Example Our database has a table named children with data in four columns: id, first_name, middle_name, and last_name. idfirst_namemiddle_namelast_name 1 John Carl Jackson 2 Tom NULL Thomson 3 Lisa Alice NULL 4 Anne NULL Smith Let’...
--autoinc:表的auto_increment--avgrowlen:表的平均行长度--checksum:表的checksum--cmin:表的创建时间,以分钟为单位--ctime:表的创建时间,以天为单位--collation:表的排序规则--column-name:表的列名--column-type:表的字段类型--comment:表的注释--createopts:表的创建选项--datafree:表的剩余大小--datasiz...
Connection pst = conn.prepareStatement(dataSql); resultSet = pst.executeQuery(); rsd = resultSet.getMetaData();【遇到的问题:问题现象及影响】 java.sql.SQLException: Can’t find column Column#371 in schema Column: Unique key: [[test.atdpersonpaycode.personid,test.atdpersonpaycode.timecarddate...
The first step is to define your criteria for a duplicate row. Do you need a combination of two columns to be unique together, or are you simply searching for duplicates in a single column? In this example, we are searching for duplicates across two columns in our Users table: username ...
Test input generation: SQLancer implements approaches for automatically generating SQL statements. It contains various hand-written SQL generators that operate in multiple phases. First, a database schema is created, which refers to a set of tables and their columns. Then, data is inserted into the...