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String sql = "select * from t_user where uid like ?";
String uid = "张";
PreparedStatement pstmt = conn.prepareStatement(sql); // 实例化PrepareStatement对象
pstmt.setString(1, "%" + uid + "%");
ResultSet rs = pstmt.executeQuery(); // 执行查询操作
while (rs.next()) {
System.out.println("====" + rs.getString("uid"));
}