public void doDeleteDB(Connection conn, String tablename, String uniquecol) throws SQLException {
StringBuilder delsql = new StringBuilder();
delsql.append("delete from ").append(tablename);
delsql.append(" where ").append(uniquecol).append("=?");
PreparedStatement ps = null;
try {
ps = conn.prepareStatement(delsql.toString());
Object tmpo = GDB.prepareObjVal(this.getValue(uniquecol));
if (tmpo == null) throw new SQLException("no key value found");
ps.setObject(1, tmpo);
ps.executeUpdate();
} finally {
if (ps != null) ps.close();
}
}
public void doUpdateDB(Connection conn, String tablename, String uniquecol, String[] cols)
throws SQLException {
StringBuilder upsql = new StringBuilder();
upsql.append("update ").append(tablename).append(" set ");
upsql.append(cols[0]).append("=?");
for (int i = 1; i < cols.length; i++) {
upsql.append(",").append(cols[i]).append("=?");
}
upsql.append(" where ").append(uniquecol).append("=?");
String[] allcols = new String[cols.length + 1];
System.arraycopy(cols, 0, allcols, 0, cols.length);
allcols[cols.length] = uniquecol;
PreparedStatement ps = null;
try {
// System.out.println(upsql.toString());
ps = conn.prepareStatement(upsql.toString());
for (int i = 0; i < allcols.length; i++) {
Object tmpo = GDB.prepareObjVal(this.getValue(allcols[i]));
if (tmpo != null) {
ps.setObject(i + 1, tmpo);
} else {
int sqlt =
this.belongToDT
.getColumn(allcols[i])
.getJdbcType(); // JavaColumnInfo.Class2SqlType(c)
if (sqlt == java.sql.Types.BLOB) // for sqlserver driver
// NullPointer error
ps.setObject(1 + i, new byte[0]);
else ps.setNull(1 + i, sqlt);
}
}
ps.executeUpdate();
} finally {
if (ps != null) ps.close();
}
}
/**
* 根据数据库连接和表和相关列，做数据库的插入操作
*
* @param conn
* @param tablename
* @param colnames
* @throws SQLException
*/
public void doInsertDB(Connection conn, String tablename, String[] colnames) throws SQLException {
StringBuilder insertsql = new StringBuilder();
insertsql.append("insert into ").append(tablename);
StringBuilder lstr = new StringBuilder(), rstr = new StringBuilder();
lstr.append("(").append(colnames[0]);
rstr.append("(?");
for (int i = 1; i < colnames.length; i++) {
lstr.append(",").append(colnames[i]);
rstr.append(",?");
}
lstr.append(")");
rstr.append(")");
insertsql.append(lstr).append("values").append(rstr);
PreparedStatement ps = null;
try {
// System.out.println(insertsql.toString()) ;
ps = conn.prepareStatement(insertsql.toString());
for (int i = 0; i < colnames.length; i++) {
Object tmpo = GDB.prepareObjVal(this.getValue(colnames[i]));
if (tmpo != null) {
ps.setObject(i + 1, tmpo);
} else {
int sqlt =
this.belongToDT
.getColumn(colnames[i])
.getJdbcType(); // JavaColumnInfo.Class2SqlType(c)
if (sqlt == java.sql.Types.BLOB) // for sqlserver driver
// NullPointer error
ps.setObject(1 + i, new byte[0]);
else ps.setNull(1 + i, sqlt);
}
}
ps.executeUpdate();
} finally {
if (ps != null) ps.close();
}
}