基于Java获取Mysql表结构的方法

云深处

Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection conn = DriverManager
.getConnection("jdbc:mysql://localhost:3306/MALL?user=root&password=123456");
DatabaseMetaData meta = (DatabaseMetaData) conn.getMetaData();
ResultSet  rs = meta.getColumns(null, "%", "T_Mall_ReturnOrderInfo", "%");
while (rs.next())  {  
// table catalog (may be null)  
String tableCat = rs.getString("TABLE_CAT");  
// table schema (may be null)  
String tableSchemaName = rs.getString("TABLE_SCHEM");  
// table name  
String tableName_ = rs.getString("TABLE_NAME");  
// column name  
String columnName = rs.getString("COLUMN_NAME");  
// SQL type from java.sql.Types  
int dataType = rs.getInt("DATA_TYPE");  
// Data source dependent type name, for a UDT the type name is  
// fully qualified  
String dataTypeName = rs.getString("TYPE_NAME");
System.out.println(columnName + "    " + dataTypeName);
// table schema (may be null)  
int columnSize = rs.getInt("COLUMN_SIZE");  
// the number of fractional digits. Null is returned for data  
// types where DECIMAL_DIGITS is not applicable.  
int decimalDigits = rs.getInt("DECIMAL_DIGITS");  
// Radix (typically either 10 or 2)  
int numPrecRadix = rs.getInt("NUM_PREC_RADIX");  
// is NULL allowed.  
int nullAble = rs.getInt("NULLABLE");  
// comment describing column (may be null)  
String remarks = rs.getString("REMARKS");  
// default value for the column, which should be interpreted as  
// a string when the value is enclosed in single quotes (may be  
// null)  
String columnDef = rs.getString("COLUMN_DEF");  
//               
int sqlDataType = rs.getInt("SQL_DATA_TYPE");  
//               
int sqlDatetimeSub = rs.getInt("SQL_DATETIME_SUB");  
// for char types the maximum number of bytes in the column  
int charOctetLength = rs.getInt("CHAR_OCTET_LENGTH");  
// index of column in table (starting at 1)  
int ordinalPosition = rs.getInt("ORDINAL_POSITION");  
// ISO rules are used to determine the nullability for a column.  
// YES --- if the parameter can include NULLs;  
// NO --- if the parameter cannot include NULLs  
// empty string --- if the nullability for the parameter is  
// unknown  
String isNullAble = rs.getString("IS_NULLABLE");  
// Indicates whether this column is auto incremented  
// YES --- if the column is auto incremented  
// NO --- if the column is not auto incremented  
// empty string --- if it cannot be determined whether the  
// column is auto incremented parameter is unknown  
String isAutoincrement = rs.getString("IS_AUTOINCREMENT");  
System.out.println(tableCat + "-" + tableSchemaName + "-" + tableName_ + "-" + columnName + "-"  
+ dataType + "-" + dataTypeName + "-" + columnSize + "-" + decimalDigits + "-" + numPrecRadix  
+ "-" + nullAble + "-" + remarks + "-" + columnDef + "-" + sqlDataType + "-" + sqlDatetimeSub  
+ charOctetLength + "-" + ordinalPosition + "-" + isNullAble + "-" + isAutoincrement + "-");
}  
conn.close();